idnits 2.17.1 draft-nandakumar-rtcweb-sdp-05.txt: Checking boilerplate required by RFC 5378 and the IETF Trust (see https://trustee.ietf.org/license-info): ---------------------------------------------------------------------------- No issues found here. Checking nits according to https://www.ietf.org/id-info/1id-guidelines.txt: ---------------------------------------------------------------------------- No issues found here. Checking nits according to https://www.ietf.org/id-info/checklist : ---------------------------------------------------------------------------- ** The document seems to lack a Security Considerations section. ** There are 18 instances of too long lines in the document, the longest one being 17 characters in excess of 72. ** The abstract seems to contain references ([RFC4566], [RFC3264], [WebRTC]), which it shouldn't. Please replace those with straight textual mentions of the documents in question. == There are 296 instances of lines with non-RFC6890-compliant IPv4 addresses in the document. If these are example addresses, they should be changed. == There are 268 instances of lines with private range IPv4 addresses in the document. If these are generic example addresses, they should be changed to use any of the ranges defined in RFC 6890 (or successor): 192.0.2.x, 198.51.100.x or 203.0.113.x. == There are 2 instances of lines with non-RFC3849-compliant IPv6 addresses in the document. If these are example addresses, they should be changed. Miscellaneous warnings: ---------------------------------------------------------------------------- == The copyright year in the IETF Trust and authors Copyright Line does not match the current year == The document seems to lack the recommended RFC 2119 boilerplate, even if it appears to use RFC 2119 keywords -- however, there's a paragraph with a matching beginning. Boilerplate error? (The document does seem to have the reference to RFC 2119 which the ID-Checklist requires). -- The document date (August 12, 2014) is 3517 days in the past. Is this intentional? Checking references for intended status: Informational ---------------------------------------------------------------------------- == Missing Reference: 'OPEN ISSUE-1' is mentioned on line 285, but not defined == Missing Reference: 'OPEN ISSUE-2' is mentioned on line 288, but not defined == Unused Reference: 'RFC3952' is defined on line 4725, but no explicit reference was found in the text == Unused Reference: 'RFC3556' is defined on line 4736, but no explicit reference was found in the text ** Obsolete normative reference: RFC 4566 (Obsoleted by RFC 8866) -- Obsolete informational reference (is this intentional?): RFC 5245 (Obsoleted by RFC 8445, RFC 8839) -- Obsolete informational reference (is this intentional?): RFC 3984 (Obsoleted by RFC 6184) -- Obsolete informational reference (is this intentional?): RFC 2326 (ref. 'RFC3550') (Obsoleted by RFC 7826) -- Duplicate reference: RFC2326, mentioned in 'RFC2326', was also mentioned in 'RFC3550'. -- Obsolete informational reference (is this intentional?): RFC 2326 (Obsoleted by RFC 7826) -- Duplicate reference: RFC4145, mentioned in 'RFC4145', was also mentioned in 'RFC3605'. -- Obsolete informational reference (is this intentional?): RFC 2833 (Obsoleted by RFC 4733, RFC 4734) Summary: 4 errors (**), 0 flaws (~~), 9 warnings (==), 8 comments (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 Network Working Group S. Nandakumar 3 Internet-Draft C. Jennings 4 Intended status: Informational Cisco 5 Expires: February 13, 2015 August 12, 2014 7 SDP for the WebRTC 8 draft-nandakumar-rtcweb-sdp-05 10 Abstract 12 The Web Real-Time Communication [WebRTC] working group is charged to 13 provide protocol support for direct interactive rich communication 14 using audio, video and data between two peers' web browsers. With in 15 the WebRTC framework, Session Description protocol (SDP) [RFC4566] is 16 used for negotiating session capabilities between the peers. Such a 17 negotiation happens based on the SDP Offer/Answer exchange mechanism 18 described in the RFC 3264 [RFC3264]. 20 This document provides an informational reference in describing the 21 role of SDP and the Offer/Answer exchange mechanism for the most 22 common WebRTC use-cases. 24 This SDP examples provided in this document is still a work in 25 progress, but it aims to align closest to the evolving standards 26 work. 28 Status of This Memo 30 This Internet-Draft is submitted in full conformance with the 31 provisions of BCP 78 and BCP 79. 33 Internet-Drafts are working documents of the Internet Engineering 34 Task Force (IETF). Note that other groups may also distribute 35 working documents as Internet-Drafts. The list of current Internet- 36 Drafts is at http://datatracker.ietf.org/drafts/current/. 38 Internet-Drafts are draft documents valid for a maximum of six months 39 and may be updated, replaced, or obsoleted by other documents at any 40 time. It is inappropriate to use Internet-Drafts as reference 41 material or to cite them other than as "work in progress." 43 This Internet-Draft will expire on February 13, 2015. 45 Copyright Notice 47 Copyright (c) 2014 IETF Trust and the persons identified as the 48 document authors. All rights reserved. 50 This document is subject to BCP 78 and the IETF Trust's Legal 51 Provisions Relating to IETF Documents 52 (http://trustee.ietf.org/license-info) in effect on the date of 53 publication of this document. Please review these documents 54 carefully, as they describe your rights and restrictions with respect 55 to this document. Code Components extracted from this document must 56 include Simplified BSD License text as described in Section 4.e of 57 the Trust Legal Provisions and are provided without warranty as 58 described in the Simplified BSD License. 60 Table of Contents 62 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 63 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 64 3. SDP and the WebRTC . . . . . . . . . . . . . . . . . . . . . 3 65 4. Offer/Answer and the WebRTC . . . . . . . . . . . . . . . . . 4 66 5. WebRTC Session Description Examples . . . . . . . . . . . . . 5 67 5.1. Some Conventions . . . . . . . . . . . . . . . . . . . . 5 68 5.2. Basic Examples . . . . . . . . . . . . . . . . . . . . . 7 69 5.2.1. Two-Way Audio Only Session . . . . . . . . . . . . . 7 70 5.2.2. Two-Way Audio/Video Session . . . . . . . . . . . . . 10 71 5.2.3. Two-Way Data Only Session . . . . . . . . . . . . . . 15 72 5.2.4. Audio Call On Hold . . . . . . . . . . . . . . . . . 17 73 5.2.5. Audio with DTMF Session . . . . . . . . . . . . . . . 20 74 5.2.6. One Way Audio/Video Session - Document Camera . . . . 25 75 5.2.7. Audio, Video Session with BUNDLE Support Unknown . . 29 76 5.2.8. Audio, Video and Data Session . . . . . . . . . . . . 36 77 5.2.9. Two-Way Audio,Video w/BUNDLE Unsupported . . . . . . 41 78 5.2.10. Audio, Video BUNDLED but Data Not BUNDLED . . . . . . 46 79 5.2.11. Audio Only then Add Video and BUNDLE . . . . . . . . 50 80 5.3. MultiResolution, RTX, FEC Examples . . . . . . . . . . . 57 81 5.3.1. Sendonly Simulcast w/2 cameras and 2 encodings per 82 camera . . . . . . . . . . . . . . . . . . . . . . . 57 83 5.3.2. Successful SVC Video Stream . . . . . . . . . . . . . 64 84 5.3.3. Successful Simulcast Video Streams with Retransmisson 68 85 5.3.4. Successful 1-way Simulcast with 2 resolutions and RTX 86 - One resolution rejected . . . . . . . . . . . . . . 73 87 5.3.5. Simulcast Video Stream with Forward Error Correction 78 88 5.4. Others . . . . . . . . . . . . . . . . . . . . . . . . . 83 89 5.4.1. Audio Session - Voice Activity Detection . . . . . . 83 90 5.4.2. Audio Conference - Voice Activity Detection . . . . . 86 91 5.4.3. Successful legacy Interop Fallaback with bundle-only 89 92 5.4.4. Legacy Interop with RTP/AVP profile . . . . . . . . . 94 94 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 99 95 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 99 96 8. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 99 97 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 100 98 9.1. Normative References . . . . . . . . . . . . . . . . . . 100 99 9.2. Informative References . . . . . . . . . . . . . . . . . 100 100 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 104 102 1. Introduction 104 Javascript Session Exchange Protocol(JSEP) [JSEP] specifies a generic 105 protocol needed to generate [RFC3264] Offers and Answers negotiated 106 between the WebRTC peers for setting up, updating and tearing down a 107 WebRTC session. For this purpose, SDP is used to construct [RFC3264] 108 Offers/Answers for describing (media and non-media) streams as 109 appropriate for the recipients of the session description to 110 participate in the session. 112 The remainder of this document is organized as follows: Section 3 and 113 4 provides an overview of SDP and the Offer/Answer exchange 114 mechanism. Section 5 provides sample SDP generated for the most 115 common WebRTC use-cases. 117 2. Terminology 119 The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT", 120 "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be 121 interpreted as described in [RFC2119]. 123 3. SDP and the WebRTC 125 The purpose of this section is to provide a general overview of SDP 126 and its components. For a more in-depth understanding, the readers 127 are advised to refer to [RFC4566]. 129 The Session Description Protocol (SDP) [RFC4566] describes multimedia 130 sessions, which can contain audio, video, whiteboard, fax, modem, and 131 other streams. SDP provides a general purpose, standard 132 representation to describe various aspects of multimedia session such 133 as media capabilities, transport addresses and related metadata in a 134 transport agnostic manner, for the purposes of session announcement, 135 session invitation and parameter negotiation. 137 As of today SDP is widely used in the context of Session Initiation 138 Protocol [RFC3261], Real-time Transport Protocol [RFC3550] and Real- 139 time Streaming Protocol applications [RFC2326]. 141 Below figure introduces high-level breakup of SDP into components 142 that semantically describe a multimedia session, in our case, a 143 WebRTC session [WebRTC]. It by no means captures everything about 144 SDP and hence, should be used for informational purposes only. 146 [WebRTC] proposes JavaScript application to fully specify and control 147 the signaling plane of a multimedia session as described in the JSEP 148 specification [JSEP]. JSEP provides mechanisms to create session 149 characterization and media definition information to conduct the 150 session based on SDP exchanges. 152 In this context, SDP serves two purposes: 154 1. Provide grammatical structure syntactically. 156 2. Semantically convey partipant's intention and capabilities 157 required to successfully negotiate a session. 159 4. Offer/Answer and the WebRTC 161 This section introduces SDP Offer/Answer Exchange mechanism mandated 162 by WebRTC for negotiating session capabilities while setting up, 163 updating and tearing down a WebRTC session. This section is 164 intentionally brief in nature and interested readers are recommended 165 to refer [RFC3264] for specific details on the protocol operation. 167 The Offer/Answer [RFC3264] model specifies rule for the bilateral 168 exchange of Session Description Protocol (SDP) messages for creation 169 of multimedia streams. It defines protocol with involved 170 participants exchanging desired session characteristics from each 171 others perspective constructed as SDP to negotiate the session 172 between them. 174 In the most basic form,the protocol operation begins by one of the 175 participants sending an initial SDP Offer describing its intent to 176 start a multimedia communication session. The participant receiving 177 the offer MAY generate an SDP Answer accepting the offer or it MAY 178 reject the offer. If the session is accepted the Offer/Answer model 179 guarantees a common view of the multimedia session between the 180 participants. 182 At any time, either participant MAY generate a new SDP offer that 183 updates the session in progress. 185 With in the context of WebRTC, the Offer/Answer model defines the 186 state-machinery for WebRTC peers to negotiate session descriptions 187 between them during the initial setup stages as well as for eventual 188 session updates. Javascript Session Establishment Protocol 189 specification [JSEP] for WebRTC provides the mechanism for generating 190 [RFC3264] SDP Offers and Answers in order for both sides of the 191 session to agree upon details such as list of media formats to be 192 sent/received, bandwidth information, crypto parameters, transport 193 parameters, for example. 195 5. WebRTC Session Description Examples 197 A typical web based real-time multimedia communication session can be 198 characterized as below: 200 o It has zero or more Audio only, Video only or Audio/Video RTP 201 Sessions, 203 o MAY contain zero or more non-media data sessions, 205 o All the sessions are secured with DTLS-SRTP, 207 o Supports NAT traversal using ICE mechanism, 209 o Provides RTCP based feedback mechanisms, 211 o Sessions can be over IPv4-only, IPv6-only, dual-stack based 212 clients. 214 5.1. Some Conventions 216 The examples given in this document follow the conventions listed 217 below: 219 o In all the examples, Alice and Bob are assumed to be the WebRTC 220 peers. 222 o [draft-ietf-mmusic-sdp-bundle-negotiation] support for 223 multiplexing several media streams on a single underlying 224 transport is enabled by default unless explicitly specified 225 otherwise. 227 o Call flow diagrams that accompany the use-cases capture only the 228 prominent aspects of the system behavior and intentionally is not 229 detailed to improve readability. 231 o The SDP examples deviate from actual on-the-wire SDP notation in 232 several ways. This is done to facilitate readability and to 233 conform to the restrictions imposed by the RFC formatting rules. 235 * Any SDP line that is indented (compared to the initial line in 236 the SDP block) is a continuation of the preceding line. The 237 line break and indent are to be interpreted as a single space 238 character. 240 * Empty lines in any SDP example are inserted to make functional 241 divisions in the SDP clearer, and are not actually part of the 242 SDP syntax. 244 * Excepting the above two conventions, line endings are to be 245 interpreted as pairs (that is, an ASCII 13 followed by 246 an ASCII 10). 248 o Against each SDP line, pointers to the appropriate RFCs are 249 provide for further information reference. Also an attempt has 250 been made to provide explanatory notes to enable better 251 understanding of the SDP usage, wherever appropriate. 253 o Following SDP details are common across all the use-cases defined 254 in this document unless mentioned otherwise. 256 * DTLS fingerprint for SRTP (a=fingerprint) 258 * RTP/RTCP Multiplexing (a=rtcp-mux) 260 * RTCP Feedback support (a=rtcp-fb) 262 * Host and server-reflexive candidate lines (a=candidate) 264 * SRTP Setup framework parameters (a=setup) 266 * RTCP attribute (a=rtcp) 268 * RTP header extension indicating audio-levels from client to the 269 mixer 271 For more details, readers are recommended to refer to the 272 Javascript Session Exchange Protocol(JSEP) [JSEP] specification. 274 o The term "Session" is used rather loosely in this document to 275 refer to either a "Communication Session" or a "RTP Session" or a 276 "RTP Stream" depending on the context. 278 o Payload type 109 is usually used for OPUS, 99 for H.264 and 120 279 for VP8 in most of the examples to maintain uniformity. 281 o In the actual use that values that represent SSRCs, ICE candidate 282 foundations, WebRTC Mediastream and MediaStreamTrack Ids can be 283 much larger and random than the ones shown in the examples. 285 [OPEN ISSUE-1]: SDP Examples for Data Channel, Simulcast, SVC are 286 still being discussed and doesn't represent the final solution. 288 [OPEN ISSUE-2]: API surface for controlling BUNDLE, TRICKLE-ICE 289 are ignored for the time being. 291 5.2. Basic Examples 293 5.2.1. Two-Way Audio Only Session 295 This common scenario shows SDP for secure Two-way audio session with 296 Alice offering Opus, PCMU, PCMA and Bob accepting all the audio 297 codecs offered. 299 title 2-Way Audio Only Session 301 participant Alice as Alice 302 participant Bob as Bob 304 Alice->Bob: Offer(Audio:Opus,PCMU,PCMA) 305 Bob->Alice: Answer(Audio:Opus,PCMU,PCMA) 306 Alice<->Bob: Two-way Opus Audio (preferred codec) 308 +--------------------------------------+----------------------------+ 309 | SDP Contents | RFC#/Notes | 310 +--------------------------------------+----------------------------+ 311 | v=0 | [RFC4566] | 312 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 313 | | Information | 314 | s=- | [RFC4566] | 315 | t=0 0 | [RFC4566] | 316 | a=msid-semantic:WMS | [MSID] | 317 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 318 | | dle-negotiation] | 319 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 320 | 0 8 | | 321 | c=IN IP4 24.23.204.141 | [RFC4566] | 322 | a=mid:audio | [RFC5888] | 323 | a=msid:ma ta | Identifies RTCMediaStream | 324 | | ID (ma) and | 325 | | RTCMediaStreamTrack ID | 326 | | (ta) | 327 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 328 | | data | 329 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 330 | | us] - Opus Codec 48khz, 2 | 331 | | channels | 332 | a=ptime:20 | [draft-ietf-payload-rtp-op | 333 | | us] - Opus packetization | 334 | | of 20ms | 335 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 336 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 337 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Alice supports | 338 | hdrext:ssrc-audio-level | RTP header extension to | 339 | | indicate audio levels | 340 | a=sendrecv | [RFC3264] - Alice can send | 341 | | and recv audio | 342 | a=setup:actpass | [RFC4145] - Alice can | 343 | | perform DTLS before Answer | 344 | | arrives | 345 | a=rtcp-mux | [RFC5761] - Alice can | 346 | | perform RTP/RTCP Muxing on | 347 | | port 54609 | 348 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 349 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 350 | 9:a8:07 | | 351 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | 352 | | fragment | 353 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] - ICE password | 354 | f08a068 | | 355 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - RTP Host | 356 | 192.168.1.4 54609 typ host | Candidate | 357 | a=candidate:1 1 UDP 694302207 | [RFC5245] - RTP Server | 358 | 24.23.204.141 54609 typ srflx raddr | Reflexive ICE Candidate | 359 | 192.168.1.4 rport 54609 | | 360 | a=candidate:0 2 UDP 2113667326 | [RFC5245] - RTCP Host | 361 | 192.168.1.4 64678 typ host | Candidate | 362 | a=candidate:1 2 UDP 1694302206 | [RFC5245] - RTCP Server | 363 | 24.23.204.141 64678 typ srflx raddr | Reflexive Candidate | 364 | 192.168.1.4 rport 64678 | | 365 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 366 | | RTCP feedback support | 367 | a=ssrc:12345 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 368 | a=rtcp-rsize | [RFC5506] - Alice intends | 369 | | to use reduced size RTCP | 370 | | for this session | 371 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 372 | | -ice] | 373 +--------------------------------------+----------------------------+ 375 Table 1: 5.2.1 SDP Offer 377 +--------------------------------------+----------------------------+ 378 | SDP Contents | RFC#/Notes | 379 +--------------------------------------+----------------------------+ 380 | v=0 | [RFC4566] | 381 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 382 | | Information | 383 | s=- | [RFC4566] | 384 | t=0 0 | [RFC4566] | 385 | a=msid-semantic:WMS | [MSID] | 386 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 387 | | dle-negotiation] | 388 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 389 | 0 8 | | 390 | c=IN IP4 98.248.92.77 | [RFC4566] | 391 | a=mid:audio | [RFC5888] | 392 | a=msid:ma ta | Identifies RTCMediaStream | 393 | | ID (ma) and | 394 | | RTCMediaStreamTrack ID | 395 | | (ta) | 396 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 397 | | data | 398 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 399 | | us] Opus Codec | 400 | a=ptime:20 | [draft-ietf-payload-rtp-op | 401 | | us] Packetization of 20ms | 402 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 403 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 404 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Bob supports | 405 | hdrext:ssrc-audio-level | audio level RTP header | 406 | | extension as well | 407 | a=sendrecv | [RFC3264] - Bob can send | 408 | | and recv audio | 409 | a=setup:active | [RFC4145] - Bob carries | 410 | | out DTLS Handshake in | 411 | | parallel | 412 | a=rtcp-mux | [RFC5761] - Bob can | 413 | | perform RTP/RTCP Muxing on | 414 | | port 49203 | 415 | a=fingerprint:sha-1 c9:c7:70:9d:1f:6 | [RFC5245] - DTLS | 416 | 6:79:a8:07:99:41:49:83:4a:97:0e:1f:e | Fingerprint for SRTP | 417 | f:6d:f7 | | 418 | a=ice-ufrag:05067423 | [RFC5245] - ICE user | 419 | | fragment | 420 | a=ice-pwd:1747d1ee3474a28a397a4c3f3a | [RFC5245] - ICE password | 421 | f08a068 | parameter | 422 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - RTP Host ICE | 423 | 192.168.1.7 49203 typ host | Candidate for Opus Stream | 424 | a=candidate:1 1 UDP 1694302207 | [RFC5245] - RTP Server | 425 | 98.248.92.77 49203 typ srflx raddr | Reflexive ICE Candidate | 426 | 192.168.1.7 rport 49203 | | 427 | a=candidate:0 2 UDP 2113667326 | [RFC5245] - RTCP Host | 428 | 192.168.1.7 60065 typ host | Candidate | 429 | a=candidate:1 2 UDP 1694302206 | [RFC5245] - RTCP Server | 430 | 98.248.92.77 60065 typ srflx raddr | Reflexive Candidate | 431 | 192.168.1.7 rport 60065 | | 432 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 433 | | RTCP feedback support | 434 | a=ssrc:54321 | [RFC5576] | 435 | cname:NWs1ao1HmN4Xa5/yvY7 | | 436 | a=rtcp-rsize | [RFC5506] - Bob intends to | 437 | | use reduced size RTCP for | 438 | | this session | 439 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 440 | | -ice] | 441 +--------------------------------------+----------------------------+ 443 Table 2: 5.2.1 SDP Answer 445 5.2.2. Two-Way Audio/Video Session 447 Alice and Bob establish an audio and video session with Opus as the 448 audio codec and H.264 as the video codec. This example also 449 illustrates the negotiation of NACK based RTCP feedback mechanisms - 450 PLI and FIR for the video session [RFC5104]. 452 title 2-Way Audio,Video Session 454 Alice->Bob: Offer(Audio:Opus,PCMU,PCMA Video:H.264,VP8) 455 Bob->Alice: Answer(Audio:Opus, Video:H.264) 456 Alice->Bob: Two-way Opus Audio, H.264 Video 458 +--------------------------------------+----------------------------+ 459 | SDP Contents | RFC#/Notes | 460 +--------------------------------------+----------------------------+ 461 | v=0 | [RFC4566] | 462 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 463 | | Information | 464 | s=- | [RFC4566] | 465 | t=0 0 | [RFC4566] | 466 | a=msid-semantic:WMS | [MSID] | 467 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 468 | | dle-negotiation] | 469 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 470 | 0 8 | | 471 | c=IN IP4 24.23.204.141 | [RFC4566] | 472 | a=mid:audio | [RFC5888] | 473 | a=msid:ma ta | Identifies RTCMediaStream | 474 | | ID (ma) and | 475 | | RTCMediaStreamTrack ID | 476 | | (ta) | 477 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 478 | | data | 479 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 480 | | us] - Opus Codec 48khz, 2 | 481 | | channels | 482 | a=ptime:20 | [draft-ietf-payload-rtp-op | 483 | | us] - Opus packetization | 484 | | of 20ms | 485 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 486 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 487 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 488 | hdrext:ssrc-audio-level | | 489 | a=sendrecv | [RFC3264] - Alice can send | 490 | | and recv audio | 491 | a=setup:actpass | [RFC4145] - Alice can | 492 | | perform DTLS before Answer | 493 | | arrives | 494 | a=rtcp-mux | [RFC5761] - Alice can | 495 | | perform RTP/RTCP Muxing on | 496 | | port 54609 | 497 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | 498 | | fragment | 499 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] - ICE password | 500 | f08a068 | parameter | 501 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 502 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 503 | 9:a8:07 | | 504 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - RTP ICE | 505 | 192.168.1.4 54609 typ host | Candidate | 506 | a=candidate:1 1 UDP 694302207 | [RFC5245] - RTP Server | 507 | 24.23.204.141 54609 typ srflx raddr | Reflexive ICE Candidate | 508 | 192.168.1.4 rport 54609 | | 509 | a=candidate:0 2 UDP 2113667326 | [RFC5245] - RTCP Host | 510 | 192.168.1.4 64678 typ host | Candidate | 511 | a=candidate:1 2 UDP 1694302206 | [RFC5245] - RTCP Server | 512 | 24.23.204.141 64678 typ srflx raddr | Reflexive Candidate. | 513 | 192.168.1.4 rport 64678 | | 514 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 515 | | RTCP feedback support | 516 | a=ssrc:12345 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 517 | a=rtcp-rsize | [RFC5506] - Alice intends | 518 | | to use reduced size RTCP | 519 | | for this session | 520 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 521 | | -ice] | 522 | m=video 54609 UDP/TLS/RTP/SAVPF 99 | [RFC4566] | 523 | 120 | | 524 | c=IN IP4 24.23.204.141 | [RFC4566] | 525 | a=mid:video | [RFC5888] | 526 | a=msid:ma tb | Identifies RTCMediaStream | 527 | | ID (ma) and | 528 | | RTCMediaStreamTrack ID | 529 | | (tb) | 530 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 531 | | data | 532 | a=rtpmap:99 H264/90000 | [RFC3984] - H.264 Video | 533 | | Codec | 534 | a=fmtp:99 profile-level-id=4d0028 | [RFC3984] | 535 | ;packetization-mode=1 | | 536 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] - | 537 | | VP8 video codec | 538 | a=sendrecv | [RFC3264] - Alice can send | 539 | | and recv video | 540 | a=setup:actpass | [RFC4145] - Alice can | 541 | | perform DTLS before Answer | 542 | | arrives | 543 | a=rtcp-mux | [RFC5761] - Alice can | 544 | | perform RTP/RTCP Muxing on | 545 | | port 62537 | 546 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | 547 | | fragment | 548 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] - ICE password | 549 | f08a068 | parameter | 550 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 551 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 552 | 9:a8:07 | | 553 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - RTP Host ICE | 554 | 192.168.1.4 54609 typ host | Candidate | 555 | a=candidate:1 1 UDP 694302207 | [RFC5245] - RTP Server | 556 | 24.23.204.141 54609 typ srflx raddr | Reflexive ICE Candidate | 557 | 192.168.1.4 rport 54609 | | 558 | a=candidate:0 2 UDP 2113667326 | [RFC5245] - RTCP Host | 559 | 192.168.1.4 64678 typ host | Candidate | 560 | a=candidate:1 2 UDP 1694302206 | [RFC5245] - RTCP Server | 561 | 24.23.204.141 64678 typ srflx raddr | Reflexive Candidate | 562 | 192.168.1.4 rport 64678 | | 563 | a=rtcp-fb:99 nack | [RFC5104] - Indicates NACK | 564 | | RTCP feedback support | 565 | a=rtcp-fb:99 nack pli | [RFC5104] - Indicates | 566 | | support for Picture loss | 567 | | Indication and NACK | 568 | a=rtcp-fb:99 ccm fir | [RFC5104] - Full Intra | 569 | | Frame Request-Codec | 570 | | Control Message support | 571 | a=rtcp-fb:120 nack | [RFC5104] - Indicates NACK | 572 | | RTCP feedback support | 573 | a=rtcp-fb:120 nack pli | [RFC5104] - Indicates | 574 | | support for Picture loss | 575 | | Indication and NACK | 576 | a=rtcp-fb:120 ccm fir | [RFC5104] - Full Intra | 577 | | Frame Request-Codec | 578 | | Control Message support | 579 | a=ssrc:1366781083 | [RFC5576] | 580 | cname:EocUG1f0fcg/yvY7 | | 581 | a=rtcp-rsize | [RFC5506] - Alice intends | 582 | | to use reduced size RTCP | 583 | | for this session | 584 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 585 | | -ice] | 586 +--------------------------------------+----------------------------+ 588 Table 3: 5.2.2 SDP Offer 590 +--------------------------------------+----------------------------+ 591 | SDP Contents | RFC#/Notes | 592 +--------------------------------------+----------------------------+ 593 | v=0 | [RFC4566] | 594 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 595 | | Information | 596 | s=- | [RFC4566] | 597 | t=0 0 | [RFC4566] | 598 | a=msid-semantic:WMS | [MSID] | 599 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 600 | | dle-negotiation] | 601 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 602 | c=IN IP4 98.248.92.77 | [RFC4566] | 603 | a=mid:audio | [RFC5888] | 604 | a=msid:ma ta | Identifies RTCMediaStream | 605 | | ID (ma) and | 606 | | RTCMediaStreamTrack ID | 607 | | (ta) | 608 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 609 | | data | 610 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 611 | | us] - Bob accepts only | 612 | | Opus Codec | 613 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 614 | hdrext:ssrc-audio-level | | 615 | a=ptime:20 | [draft-ietf-payload-rtp-op | 616 | | us] | 617 | a=sendrecv | [RFC3264] - Bob can send | 618 | | and recv audio | 619 | a=setup:active | [RFC4145] - Bob carries | 620 | | out DTLS Handshake in | 621 | | parallel | 622 | a=rtcp-mux | [RFC5761] - Bob can | 623 | | perform RTP/RTCP Muxing on | 624 | | port 49203 | 625 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username | 626 | | frag | 627 | a=ice- | [RFC5245] - ICE password | 628 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 629 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 630 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 631 | 9:a8:07 | | 632 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - RTP Host ICE | 633 | 192.168.1.7 49203 typ host | Candidate for Opus Stream | 634 | a=candidate:1 1 UDP 1694302207 | [RFC5245] - RTP Server | 635 | 98.248.92.77 49203 typ srflx raddr | Reflexive ICE Candidate | 636 | 192.168.1.7 rport 49203 | | 637 | a=candidate:0 2 UDP 2113667326 | [RFC5245] - RTPC Host | 638 | 192.168.1.7 60065 typ host | Candidate | 639 | a=candidate:1 2 UDP 1694302206 | [RFC5245] - RTCP Server | 640 | 98.248.92.77 60065 typ srflx raddr | Reflexive Candidate. | 641 | 192.168.1.7 rport 60065 | | 642 | a=ssrc:1366788312 | [RFC5576] | 643 | cname:1f0fcgEocUG/yvY7 | | 644 | a=rtcp-rsize | [RFC5506] - Bob intends to | 645 | | use reduced size RTCP for | 646 | | this session | 647 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 648 | | -ice] | 649 | m=video 49203 UDP/TLS/RTP/SAVPF 99 | [RFC4566] | 650 | c=IN IP4 98.248.92.77 | [RFC4566] | 651 | a=mid:video | [RFC5888] | 652 | a=msid:ma tb | Identifies RTCMediaStream | 653 | | ID (ma) and | 654 | | RTCMediaStreamTrack ID | 655 | | (tb) | 656 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 657 | | data | 658 | a=rtpmap:99 H264/90000 | [RFC3984] - Bob accepts | 659 | | H.264 Video Codec. | 660 | a=fmtp:99 profile-level-id=4d0028 | [RFC3984] | 661 | ;packetization-mode=1 | | 662 | a=sendrecv | [RFC3264] - Bob can send | 663 | | and recv video | 664 | a=setup:active | [RFC4145] - Bob carries | 665 | | out DTLS Handshake in | 666 | | parallel | 667 | a=rtcp-mux | [RFC5761] - Bob can | 668 | | perform RTP/RTCP Muxing on | 669 | | port 63130 | 670 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username | 671 | | frag | 672 | a=ice- | [RFC5245] - ICE password | 673 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 674 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 675 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 676 | 9:a8:07 | | 677 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - Host ICE | 678 | 192.168.1.7 49203 typ host | Candidate for Opus Stream | 679 | a=candidate:1 1 UDP 1694302207 | [RFC5245] - Server | 680 | 98.248.92.77 49203 typ srflx raddr | Reflexive ICE Candidate | 681 | 192.168.1.7 rport 49203 | for the above host | 682 | | candidate | 683 | a=candidate:0 2 UDP 2113667326 | [RFC5245] - Second Host | 684 | 192.168.1.7 60065 typ host | Candidate | 685 | a=candidate:1 2 UDP 1694302206 | [RFC5245] - Server | 686 | 98.248.92.77 60065 typ srflx raddr | Reflexive Candidate for | 687 | 192.168.1.7 rport 60065 | the Second Host Candidate | 688 | a=rtcp-fb:99 nack | [RFC5104] - Indicates | 689 | | support for NACK based | 690 | | RTCP feedback | 691 | a=rtcp-fb:99 nack pli | [RFC5104] - Indicates | 692 | | support for Picture loss | 693 | | Indication and NACK | 694 | a=rtcp-fb:99 ccm fir | [RFC5104] - Full Intra | 695 | | Frame Request-Codec | 696 | | Control Message support | 697 | a=ssrc:3229706345 | [RFC5576] | 698 | cname:Q/NWs1ao1HmN4Xa5 | | 699 | a=rtcp-rsize | [RFC5506] - Bob intends to | 700 | | use reduced size RTCP for | 701 | | this session | 702 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 703 | | -ice] | 704 +--------------------------------------+----------------------------+ 706 Table 4: 5.2.2 SDP Answer 708 5.2.3. Two-Way Data Only Session 710 This scenario illustrates SDP negotiated to setup a data-only session 711 based on SCTP Data Channel, thus enabling use-cases such as file- 712 transfer for example. 714 title WebRTC Session - 2-Way Secure Audio,Video with RTCP Feedback 715 Alice->Bob: Offer(DataChannel) 716 Bob->Alice: Answer(Data-Channel) 717 Alice->Bob: Two-way SCTP based Data-Channel 719 +--------------------------------------+----------------------------+ 720 | SDP Contents | RFC#/Notes | 721 +--------------------------------------+----------------------------+ 722 | v=0 | [RFC4566] | 723 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 724 | | Information | 725 | s=- | [RFC4566] | 726 | t=0 0 | [RFC4566] | 727 | a=msid-semantic:WMS | [MSID] | 728 | a=group:BUNDLE data | [draft-ietf-mmusic-sdp-bun | 729 | | dle-negotiation] | 730 | a=ice-ufrag:074c6550 | [RFC5245] - Session Level | 731 | | ICE parameter | 732 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] - Session Level | 733 | f08a068 | ICE parameter | 734 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - Session DTLS | 735 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 736 | 9:a8:07 | | 737 | m=application 56966 DTLS/SCTP 5000 | [draft-ietf-rtcweb-data-ch | 738 | | annel] | 739 | c=IN IP4 24.23.204.141 | [RFC4566] | 740 | a=mid:data | [RFC5888] | 741 | a=sctpmap:5000 webrtc-DataChannel | [draft-ietf-mmusic-sctp-sd | 742 | streams=16;label="channel | p] | 743 | 1";subprotocol="chat"; | | 744 | a=setup:actpass | [RFC4145] - Alice can | 745 | | perform DTLS before Answer | 746 | | arrives | 747 | a=sendrecv | [RFC3264] - Alice can send | 748 | | and recv non-media data | 749 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 750 | 192.168.1.7 56966 typ host | | 751 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 752 | 24.23.204.141 56966 typ srflx raddr | | 753 | 192.168.1.7 rport 56966 | | 754 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 755 | | -ice] | 756 +--------------------------------------+----------------------------+ 758 Table 5: 5.2.3 SDP Offer 760 +--------------------------------------+----------------------------+ 761 | SDP Contents | RFC#/Notes | 762 +--------------------------------------+----------------------------+ 763 | v=0 | [RFC4566] | 764 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 765 | | Information | 766 | s=- | [RFC4566] | 767 | t=0 0 | [RFC4566] | 768 | a=msid-semantic:WMS | [MSID] | 769 | a=group:BUNDLE data | [draft-ietf-mmusic-sdp-bun | 770 | | dle-negotiation] | 771 | m=application 55700 DTLS/SCTP 5000 | [draft-ietf-mmusic-sctp-sd | 772 | | p] | 773 | c=IN IP4 98.248.92.771 | [RFC4566] | 774 | a=mid:data | [RFC5888] | 775 | a=sctpmap:5000 webrtc- | [draft-ietf-mmusic-sctp-sd | 776 | DataChannel:5000 | p] | 777 | streams=1;label="channel | | 778 | 1";subprotocol="chat"; | | 779 | a=setup:active | [RFC4145] - Bob carries | 780 | | out DTLS Handshake in | 781 | | parallel | 782 | a=sendrecv | [RFC3264] - Bob can send | 783 | | and recv non-media data | 784 | a=ice-ufrag:c300d85b | [RFC5245] - Session Level | 785 | | ICE username frag | 786 | a=ice- | [RFC5245] - Session Level | 787 | pwd:de4e99bd291c325921d5d47efbabd9a2 | ICE password | 788 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - Session DTLS | 789 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 790 | 9:a8:07 | | 791 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - Refer 4.1 SDP | 792 | 192.168.1.7 55700 typ host | Offer | 793 | a=candidate:1 1 UDP 1694302207 | [RFC5245] Refer 4.1 SDP | 794 | 98.248.92.77 55700 typ srflx raddr | Offer | 795 | 192.168.1.7 rport 55700 | | 796 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 797 | | -ice] | 798 +--------------------------------------+----------------------------+ 800 Table 6: 5.2.3 SDP Answer 802 5.2.4. Audio Call On Hold 804 Alice calls Bob, but when Bob answers he places Alice on hold by 805 setting the SDP direction attribute to a=sendonly in the Answer. 807 title Secure 2-Way Audio Only Session 808 participant Alice as Alice 809 participant Bob as Bob 810 Alice->Bob: Offer(Audio:Opus) 811 Bob->Alice: Answer(Audio:Opus,a=sendonly) 812 Alice->Bob: One-way Opus Audio (preferred codec) 814 +--------------------------------------+----------------------------+ 815 | SDP Contents | RFC#/Notes | 816 +--------------------------------------+----------------------------+ 817 | v=0 | [RFC4566] | 818 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 819 | | Information | 820 | s=- | [RFC4566] | 821 | t=0 0 | [RFC4566] | 822 | a=msid-semantic:WMS | [MSID] | 823 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 824 | | dle-negotiation] | 825 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 826 | c=IN IP4 24.23.204.141 | [RFC4566] | 827 | a=mid:audio | [RFC5888] | 828 | a=msid:ma ta | Identifies RTCMediaStream | 829 | | ID (ma) and | 830 | | RTCMediaStreamTrack ID | 831 | | (ta) | 832 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 833 | | data | 834 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 835 | | us] - Opus Codec 48khz, 2 | 836 | | channels | 837 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 838 | hdrext:ssrc-audio-level | | 839 | a=ptime:20 | [draft-ietf-payload-rtp-op | 840 | | us] - Opus packetization | 841 | | of 20ms | 842 | a=sendrecv | [RFC3264] - Alice can send | 843 | | and recv audio | 844 | a=setup:actpass | [RFC4145] - Alice can | 845 | | perform DTLS before Answer | 846 | | arrives | 847 | a=rtcp-mux | [RFC5761] - Alice can | 848 | | perform RTP/RTCP Muxing on | 849 | | port 54609 | 850 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | 851 | | fragment | 852 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] - ICE password | 853 | f08a068 | | 854 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 855 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 856 | 9:a8:07 | | 857 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 858 | 192.168.1.4 54609 typ host | | 859 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 860 | 24.23.204.141 54609 typ srflx raddr | | 861 | 192.168.1.4 rport 54609 | | 862 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 863 | 192.168.1.4 64678 typ host | | 864 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 865 | 24.23.204.141 64678 typ srflx raddr | | 866 | 192.168.1.4 rport 64678 | | 867 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 868 | | RTCP feedback support | 869 | a=ssrc:3229706345 | [RFC5576] | 870 | cname:Q/NWs1ao1HmN4Xa5 | | 871 | a=rtcp-rsize | [RFC5506] | 872 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 873 | | -ice] | 874 +--------------------------------------+----------------------------+ 876 Table 7: 5.2.4 SDP Offer 878 +--------------------------------------+----------------------------+ 879 | SDP Contents | RFC#/Notes | 880 +--------------------------------------+----------------------------+ 881 | v=0 | [RFC4566] | 882 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 883 | | Information | 884 | s=- | [RFC4566] | 885 | t=0 0 | [RFC4566] | 886 | a=msid-semantic:WMS | [MSID] | 887 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 888 | | dle-negotiation] | 889 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 890 | c=IN IP4 98.248.92.77 | [RFC4566] | 891 | a=mid:audio | [RFC5888] | 892 | a=msid:ma ta | Identifies RTCMediaStream | 893 | | ID (ma) and | 894 | | RTCMediaStreamTrack ID | 895 | | (ta) | 896 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 897 | | data | 898 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 899 | | us] - Bob accepts only | 900 | | Opus Codec | 901 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 902 | hdrext:ssrc-audio-level | | 903 | a=ptime:20 | [draft-ietf-payload-rtp-op | 904 | | us] | 905 | a=sendonly | [RFC3264] - Bob puts call | 906 | | On Hold | 907 | a=setup:active | [RFC4145] - Bob carries | 908 | | out DTLS Handshake in | 909 | | parallel | 910 | a=rtcp-mux | [RFC5761] - Bob can | 911 | | perform RTP/RTCP Muxing on | 912 | | port 49203 | 913 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username | 914 | | frag | 915 | a=ice- | [RFC5245] - ICE password | 916 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 917 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 918 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 919 | 9:a8:07 | | 920 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 921 | 192.168.1.7 49203 typ host | | 922 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 923 | 98.248.92.77 49203 typ srflx raddr | | 924 | 192.168.1.7 rport 49203 | | 925 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 926 | 192.168.1.7 60065 typ host | | 927 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 928 | 98.248.92.77 60065 typ srflx raddr | | 929 | 192.168.1.7 rport 60065 | | 930 | a=ssrc:1366781083 | [RFC5576] | 931 | cname:EocUG1f0fcg/yvY7 | | 932 | a=rtcp-rsize | [RFC5506] | 933 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 934 | | -ice] | 935 +--------------------------------------+----------------------------+ 937 Table 8: 5.2.4 SDP Answer 939 5.2.5. Audio with DTMF Session 941 In this example, Alice wishes to establish two separate audio 942 streams, one for normal audio and the other for telephone-events. 943 Alice offers first audio stream with three codecs and the other with 944 [RFC2833] tones (for DTMF). Bob accepts both the audio streams by 945 choosing Opus as the audio codec and the telephone-event for the 946 other stream. 948 title Audio Session with DTMF 949 participant Alice as Alice 950 participant Bob as Bob 951 Alice->Bob: Offer(Audio:Opus,PCMU,PCMA Audio:telephone-event) 952 Bob->Alice: Answer(Audio:Opus, Audio:telephone-event) 953 Alice->Bob: Opus audio stream and telephone-event stream 955 +--------------------------------------+----------------------------+ 956 | SDP Contents | RFC#/Notes | 957 +--------------------------------------+----------------------------+ 958 | v=0 | [RFC4566] | 959 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 960 | | Information | 961 | s=- | [RFC4566] | 962 | t=0 0 | [RFC4566] | 963 | a=msid-semantic:WMS | [MSID] | 964 | a=group:BUNDLE audio dtmf | [draft-ietf-mmusic-sdp-bun | 965 | | dle-negotiation] | 966 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 967 | 0 8 | | 968 | c=IN IP4 24.23.204.141 | [RFC4566] | 969 | a=mid:audio | [RFC5888] | 970 | a=msid:ma ta | Identifies RTCMediaStream | 971 | | ID (ma) and | 972 | | RTCMediaStreamTrack ID | 973 | | (ta) | 974 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 975 | | data | 976 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 977 | | us] - Opus Codec 48khz, 2 | 978 | | channels | 979 | a=ptime:20 | [draft-ietf-payload-rtp-op | 980 | | us] - Opus packetization | 981 | | of 20ms | 982 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 983 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 984 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 985 | hdrext:ssrc-audio-level | | 986 | a=sendrecv | [RFC3264] - Alice can send | 987 | | and recv audio | 988 | a=setup:actpass | [RFC4145] - Alice can | 989 | | perform DTLS before Answer | 990 | | arrives | 991 | a=rtcp-mux | [RFC5761] - Alice can | 992 | | perform RTP/RTCP Muxing on | 993 | | port 54609 | 994 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | 995 | | fragment | 996 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] - ICE password | 997 | f08a068 | parameter | 998 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 999 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 1000 | 9:a8:07 | | 1001 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1002 | 192.168.1.4 54609 typ host | | 1003 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1004 | 24.23.204.141 54609 typ srflx raddr | | 1005 | 192.168.1.4 rport 54609 | | 1006 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1007 | 192.168.1.4 64678 typ host | | 1008 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1009 | 24.23.204.141 64678 typ srflx raddr | | 1010 | 192.168.1.4 rport 64678 | | 1011 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 1012 | | RTCP feedback support | 1013 | a=ssrc:3229706345 | [RFC5576] | 1014 | cname:Q/NWs1ao1HmN4Xa5 | | 1015 | a=rtcp-rsize | [RFC5506] | 1016 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1017 | | -ice] | 1018 | m=audio 54609 UDP/TLS/RTP/SAVPF 126 | [RFC4566] | 1019 | c=IN IP4 24.23.204.141 | [RFC4566] | 1020 | a=mid:dtmf | [RFC5888] | 1021 | a=msid:ma tb | Identifies RTCMediaStream | 1022 | | ID (ma) and | 1023 | | RTCMediaStreamTrack ID | 1024 | | (tb) | 1025 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 1026 | | data | 1027 | a=rtpmap:126 telephone-event/8000 | [RFC2833] | 1028 | a=sendonly | [RFC3264] - Alice can send | 1029 | | DTMF Events | 1030 | a=setup:actpass | [RFC4145] - Alice can | 1031 | | perform DTLS before Answer | 1032 | | arrives | 1033 | a=rtcp-mux | [RFC5761] | 1034 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user | 1035 | | fragment | 1036 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] - ICE password | 1037 | f08a068 | parameter | 1038 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - DTLS | 1039 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | Fingerprint for SRTP | 1040 | 9:a8:07 | | 1041 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1042 | 192.168.1.4 54609 typ host | | 1043 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1044 | 24.23.204.141 54609 typ srflx raddr | | 1045 | 192.168.1.4 rport 54609 | | 1046 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1047 | 192.168.1.4 64678 typ host | | 1048 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1049 | 24.23.204.141 64678 typ srflx raddr | | 1050 | 192.168.1.4 rport 64678 | | 1051 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 1052 | | RTCP feedback support | 1053 | a=ssrc:9032206345 | [RFC5576] | 1054 | cname:L/N9lk1ao1HmN4Xa5 | | 1055 | a=rtcp-rsize | [RFC5506] | 1056 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1057 | | -ice] | 1058 +--------------------------------------+----------------------------+ 1060 Table 9: 5.2.5 SDP Offer 1062 +--------------------------------------+----------------------------+ 1063 | SDP Contents | RFC#/Notes | 1064 +--------------------------------------+----------------------------+ 1065 | v=0 | [RFC4566] | 1066 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 1067 | | Information | 1068 | s=- | [RFC4566] | 1069 | t=0 0 | [RFC4566] | 1070 | a=msid-semantic:WMS | [MSID] | 1071 | a=group:BUNDLE audio dtmf | [draft-ietf-mmusic-sdp-bun | 1072 | | dle-negotiation] | 1073 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1074 | c=IN IP4 98.248.92.77 | [RFC4566] | 1075 | a=mid:audio | [RFC5888] | 1076 | a=msid:ma ta | Identifies RTCMediaStream | 1077 | | ID (ma) and | 1078 | | RTCMediaStreamTrack ID | 1079 | | (ta) | 1080 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 1081 | | data | 1082 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1083 | | us] - Bob accepts Opus | 1084 | | Codec | 1085 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1086 | hdrext:ssrc-audio-level | | 1087 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1088 | | us] | 1089 | a=sendrecv | [RFC3264] - Bob can send | 1090 | | and receive Opus audio | 1091 | a=setup:active | [RFC4145] - Bob carries | 1092 | | out DTLS Handshake in | 1093 | | parallel | 1094 | a=rtcp-mux | [RFC5761] - Bob can | 1095 | | perform RTP/RTCP Muxing on | 1096 | | port 49203 | 1097 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username | 1098 | | frag | 1099 | a=ice- | [RFC5245] - ICE password | 1100 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1101 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - Fingerprint | 1102 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | for SRTP | 1103 | 9:a8:07 | | 1104 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1105 | 192.168.1.7 49203 typ host | | 1106 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1107 | 98.248.92.77 49203 typ srflx raddr | | 1108 | 192.168.1.7 rport 49203 | | 1109 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1110 | 192.168.1.7 60065 typ host | | 1111 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1112 | 98.248.92.77 60065 typ srflx raddr | | 1113 | 192.168.1.7 rport 60065 | | 1114 | a=ssrc:0634322975 | [RFC5576] | 1115 | cname:Q/o1HmN4XNWs1aa5 | | 1116 | a=rtcp-rsize | [RFC5506] - Alice intends | 1117 | | to use reduced size RTCP | 1118 | | for this session | 1119 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1120 | | -ice] | 1121 | m=audio 49203 UDP/TLS/RTP/SAVPF 126 | [RFC4566] | 1122 | c=IN IP4 98.248.92.77 | [RFC4566] | 1123 | a=mid:dtmf | [RFC5888] | 1124 | a=msid:ma tb | Identifies RTCMediaStream | 1125 | | ID (ma) and | 1126 | | RTCMediaStreamTrack ID | 1127 | | (tb) | 1128 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 1129 | | data | 1130 | a=rtpmap:126 telephone-event/8000 | [RFC2833] | 1131 | a=recvonly | [RFC3264] - Alice can | 1132 | | receive DTMF events | 1133 | a=setup:active | [RFC4145] - Bob carries | 1134 | | out DTLS Handshake in | 1135 | | parallel | 1136 | a=rtcp-mux | [RFC5761] - Alice can | 1137 | | perform RTP/RTCP Muxing on | 1138 | | port 54690 | 1139 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username | 1140 | | frag | 1141 | a=ice- | [RFC5245] - ICE password | 1142 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1143 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] - Fingerprint | 1144 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | for SRTP | 1145 | 9:a8:07 | | 1146 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1147 | 192.168.1.7 49203 typ host | | 1148 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1149 | 98.248.92.77 49203 typ srflx raddr | | 1150 | 192.168.1.7 rport 49203 | | 1151 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1152 | 192.168.1.7 60065 typ host | | 1153 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1154 | 98.248.92.77 60065 typ srflx raddr | | 1155 | 192.168.1.7 rport 60065 | | 1156 | a=ssrc:6345903220 | [RFC5576] | 1157 | cname:L/k1aN9lo1HmN4Xa5 | | 1158 | a=rtcp-rsize | [RFC5506] - Alice intends | 1159 | | to use reduced size RTCP | 1160 | | for this session | 1161 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1162 | | -ice] | 1163 +--------------------------------------+----------------------------+ 1165 Table 10: 5.2.5 SDP Answer 1167 5.2.6. One Way Audio/Video Session - Document Camera 1169 In this scenario Alice and Bob engage in 1 way audio and video 1170 session with Bob receiving Alice's audio and her presentation slides 1171 as video stream. 1173 title 1 Way Audio & Video Session - Document Camera 1175 note right of Alice 1176 Alice Offers sendonly audio and video streams. 1177 The video stream corresponds to her presentation 1178 slides via a=content SDP attribute) 1179 end note 1180 Alice->Bob: Offer(Audio:Opus, Video: VP8) 1181 note left of Bob 1182 Bob accepts Alice's offer 1183 end note 1184 Bob->Alice: Answer(Audio:Opus, Video: VP8) 1185 Alice->Bob: One-way Opus Audio, VP8 Video 1186 note right of Alice 1187 Bob can hear Alice and see her presentation slides. 1188 end note 1190 +--------------------------------------+----------------------------+ 1191 | SDP Contents | RFC#/Notes | 1192 +--------------------------------------+----------------------------+ 1193 | v=0 | [RFC4566] | 1194 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 1195 | s=- | [RFC4566] | 1196 | t=0 0 | [RFC4566] | 1197 | a=msid-semantic:WMS | [MSID] | 1198 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 1199 | | dle-negotiation] | 1200 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1201 | c=IN IP4 24.23.204.141 | [RFC4566] | 1202 | a=mid:audio | [RFC5888] | 1203 | a=msid:ma ta | Identifies RTCMediaStream | 1204 | | ID (ma) and | 1205 | | RTCMediaStreamTrack ID | 1206 | | (ta) | 1207 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 1208 | | data | 1209 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1210 | | us] | 1211 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1212 | hdrext:ssrc-audio-level | | 1213 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1214 | | us] | 1215 | a=sendonly | [RFC3264] - Send only | 1216 | | audio stream | 1217 | a=setup:actpass | [RFC4145] - Alice can | 1218 | | perform DTLS before Answer | 1219 | | arrives | 1220 | a=rtcp-mux | [RFC5761] | 1221 | a=ice-ufrag:074c6550 | [RFC5245] | 1222 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1223 | f08a068 | | 1224 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1225 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1226 | 9:a8:07 | | 1227 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1228 | 24.23.204.141 54609 typ host | | 1229 | a=candidate:0 2 UDP 2113667326 | [RFC5104] | 1230 | 24.23.204.141 64678 typ host | | 1231 | a=rtcp-fb:109 nack | [RFC5104] | 1232 | a=ssrc:6345903220 | [RFC5576] | 1233 | cname:L/k1aN9lo1HmN4Xa5 | | 1234 | a=rtcp-rsize | [RFC5506] | 1235 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1236 | | -ice] | 1237 | m=video 54609 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 1238 | c=IN IP4 24.23.204.141 | [RFC4566] | 1239 | a=mid:video | [RFC5888] | 1240 | a=msid:ma tb | Identifies RTCMediaStream | 1241 | | ID (ma) and | 1242 | | RTCMediaStreamTrack ID | 1243 | | (tb) | 1244 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 1245 | | data | 1246 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 1247 | a=content:slides | [RFC4796] -Alice's | 1248 | | presentation video stream | 1249 | a=sendonly | [RFC3264] - Send only | 1250 | | video stream | 1251 | a=setup:actpass | [RFC4145] - Alice can | 1252 | | perform DTLS before Answer | 1253 | | arrives | 1254 | a=rtcp-mux | [RFC5761] | 1255 | a=ice-ufrag:074c6550 | [RFC5245] | 1256 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1257 | f08a068 | | 1258 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1259 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1260 | 9:a8:07 | | 1261 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1262 | 24.23.204.141 54609 typ host | | 1263 | a=candidate:0 2 UDP 2113667326 | [RFC5104] | 1264 | 24.23.204.141 64678 typ host | | 1265 | a=rtcp-fb:120 nack | [RFC5104] | 1266 | a=rtcp-fb:120 nack pli | [RFC5104] | 1267 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1268 | a=ssrc:3429951804 | [RFC5576] | 1269 | cname:Q/NWs1ao1HmN4Xa5 | | 1270 | a=rtcp-rsize | [RFC5506] | 1271 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1272 | | -ice] | 1273 +--------------------------------------+----------------------------+ 1275 Table 11: 5.2.6 SDP Offer 1277 +--------------------------------------+----------------------------+ 1278 | SDP Contents | RFC#/Notes | 1279 +--------------------------------------+----------------------------+ 1280 | v=0 | [RFC4566] | 1281 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 1282 | s=- | [RFC4566] | 1283 | t=0 0 | [RFC4566] | 1284 | a=msid-semantic:WMS | [MSID] | 1285 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 1286 | | dle-negotiation] | 1287 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1288 | c=IN IP4 98.248.92.77 | [RFC4566] | 1289 | a=mid:audio | [RFC5888] | 1290 | a=msid:ma ta | Identifies RTCMediaStream | 1291 | | ID (ma) and | 1292 | | RTCMediaStreamTrack ID | 1293 | | (ta) | 1294 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 1295 | | data | 1296 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1297 | | us] | 1298 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1299 | hdrext:ssrc-audio-level | | 1300 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1301 | | us] | 1302 | a=recvonly | [RFC3264] - Receive only | 1303 | | audio stream | 1304 | a=setup:active | [RFC4145] - Bob carries | 1305 | | out DTLS Handshake in | 1306 | | parallel | 1307 | a=rtcp-mux | [RFC5761] | 1308 | a=ice-ufrag:c300d85b | [RFC5245] | 1309 | a=ice- | [RFC5245] | 1310 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1311 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1312 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1313 | 9:a8:07 | | 1314 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1315 | 98.248.92.77 49203 typ host | | 1316 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1317 | 98.248.92.77 60065 typ host | | 1318 | a=ssrc:9513429804 | [RFC5576] | 1319 | cname:Q/o1HmNWs1aN4Xa5 | | 1320 | a=rtcp-rsize | [RFC5506] | 1321 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1322 | | -ice] | 1323 | m=video 49203 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 1324 | c=IN IP4 98.248.92.77 | [RFC4566] | 1325 | a=mid:video | [RFC5888] | 1326 | a=msid:ma tb | Identifies RTCMediaStream | 1327 | | ID (ma) and | 1328 | | RTCMediaStreamTrack ID | 1329 | | (tb) | 1330 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 1331 | | data | 1332 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 1333 | a=content:slides | [RFC4796] | 1334 | a=recvonly | [RFC3264] - Receive Only | 1335 | | Alice's presentation | 1336 | | stream | 1337 | a=setup:active | [RFC4145] - Bob carries | 1338 | | out DTLS Handshake in | 1339 | | parallel | 1340 | a=rtcp-mux | [RFC5761] | 1341 | a=ice-ufrag:c300d85b | [RFC5245] | 1342 | a=ice- | [RFC5245] | 1343 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1344 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1345 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1346 | 9:a8:07 | | 1347 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1348 | 98.248.92.77 49203 typ host | | 1349 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1350 | 98.248.92.77 60065 typ host | | 1351 | a=ssrc:1366781083 | [RFC5576] | 1352 | cname:EocUG1f0fcg/yvY7 | | 1353 | a=rtcp-rsize | [RFC5506] | 1354 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1355 | | -ice] | 1356 +--------------------------------------+----------------------------+ 1358 Table 12: 5.2.6 SDP Answer 1360 5.2.7. Audio, Video Session with BUNDLE Support Unknown 1362 In this example, since Alice is unsure of the Bob's support of the 1363 BUNDLE framework, following 3 step procedures are performed in order 1364 to negotiate and setup a unique BUNDLE Address for the session 1365 o An SDP Offer, in which the Alice assigns unique addresses to each 1366 "m=" line in the BUNDLE group, and requests the Answerer to select 1367 the Offerer's BUNDLE address. 1369 o An SDP Answer, in which the Bob indicates its support for BUNDLE, 1370 and assigns its own BUNDLE address for the BUNDLED m= lines. 1372 o A subsequent SDP Offer from Alice, which is used to perform a 1373 BUNDLE Address Synchronization (BAS). 1375 Once the Offer/Answer exchange completes, both Alice and Bob each end 1376 up using single RTP Session for both the Media Streams. 1378 title 2-Way Secure Audio,Video with BUNDLE support unknown 1380 Alice->Bob: Offer(Audio:Opus Video:VP8) 1381 note right of Alice 1382 Alice offers BUNDLE support with unique address for the audio and video m-line 1383 end note 1385 Bob->Alice: Answer(Audio:Opus Video:VP8) indicating its support for BUNDLE 1386 note left of Bob 1387 Bob uses identical addresses across the m=lines 1388 end note 1390 Alice->Bob: Updated Offer(Audio:Opus Video:VP8) for Bundle Address Synchronzation. 1392 Alice <-> Bob: 2Way Call with Audio and Video Multiplexed 1394 +--------------------------------------+----------------------------+ 1395 | SDP Contents | RFC#/Notes | 1396 +--------------------------------------+----------------------------+ 1397 | v=0 | [RFC4566] | 1398 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1399 | s=- | [RFC4566] | 1400 | t=0 0 | [RFC4566] | 1401 | a=msid-semantic:WMS | [MSID] | 1402 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 1403 | | dle-negotiation] Alice | 1404 | | supports grouping of | 1405 | | m=lines under BUNDLE | 1406 | | semantics | 1407 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1408 | c=IN IP4 24.23.204.141 | [RFC4566] | 1409 | a=mid:audio | [RFC5888] Audio m=line | 1410 | | part of BUNDLE group with | 1411 | | a unique port number | 1412 | a=msid:ma ta | Identifies RTCMediaStream | 1413 | | ID (ma) and | 1414 | | RTCMediaStreamTrack ID | 1415 | | (ta) | 1416 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 1417 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1418 | | us] | 1419 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1420 | hdrext:ssrc-audio-level | | 1421 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1422 | | us] | 1423 | a=sendrecv | [RFC3264] | 1424 | a=setup:actpass | [RFC4145] - Alice can | 1425 | | perform DTLS before Answer | 1426 | | arrives | 1427 | a=rtcp-mux | [RFC5761] | 1428 | a=ssrc:11111 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 1429 | a=ice-ufrag:074c6550 | [RFC5245] | 1430 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1431 | f08a068 | | 1432 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1433 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1434 | 9:a8:07 | | 1435 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1436 | 192.168.1.4 54609 typ host | | 1437 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1438 | 24.23.204.141 54609 typ srflx raddr | | 1439 | 192.168.1.4 rport 54609 | | 1440 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1441 | 192.168.1.4 64678 typ host | | 1442 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1443 | 24.23.204.141 64678 typ srflx raddr | | 1444 | 192.168.1.4 rport 64678 | | 1445 | a=rtcp-fb:109 nack | [RFC5104] | 1446 | a=rtcp-rsize | [RFC5506] | 1447 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1448 | | -ice] | 1449 | m=video 62537 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 1450 | c=IN IP4 24.23.204.141 | [RFC4566] | 1451 | a=mid:video | [RFC5888] Video m=line | 1452 | | part of the Bundle group | 1453 | | with a unique port number | 1454 | a=msid:ma tb | Identifies RTCMediaStream | 1455 | | ID (ma) and | 1456 | | RTCMediaStreamTrack ID | 1457 | | (tb) | 1458 | a=rtcp:54721 IN IP4 24.23.204.141 | [RFC3605] - Port for RTCP | 1459 | | data | 1460 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 1461 | a=sendrecv | [RFC3264] | 1462 | a=setup:actpass | [RFC4145] - Alice can | 1463 | | perform DTLS before Answer | 1464 | | arrives | 1465 | a=rtcp-mux | [RFC5761] | 1466 | a=ssrc:22222 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 1467 | a=ice-ufrag:6550074c | [RFC5245] | 1468 | a=ice-pwd:74af08a068a28a397a4c3f3174 | [RFC5245] | 1469 | 7d1ee34 | | 1470 | a=fingerprint:sha-1 1f:ef:6d:f7:c9:c | [RFC5245] | 1471 | 7:70:9d:1f:66:99:41:49:83:4a:97:0e79 | | 1472 | :a8:07 | | 1473 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1474 | 192.168.1.4 62537 typ host | | 1475 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1476 | 24.23.204.141 62537 typ srflx raddr | | 1477 | 192.168.1.4 rport 62537 | | 1478 | a=candidate:0 2 2113667326 | [RFC5245] | 1479 | 192.168.1.4 54721 typ host | | 1480 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1481 | 24.23.204.141 54721 typ srflx raddr | | 1482 | 192.168.1.4 rport 54721 | | 1483 | a=rtcp-fb:120 nack | [RFC5104] | 1484 | a=rtcp-fb:120 nack pli | [RFC5104] | 1485 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1486 | a=rtcp-rsize | [RFC5506] | 1487 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1488 | | -ice] | 1489 +--------------------------------------+----------------------------+ 1491 Table 13: 5.2.7 SDP Offer w/BUNDLE 1493 +--------------------------------------+----------------------------+ 1494 | SDP Contents | RFC#/Notes | 1495 +--------------------------------------+----------------------------+ 1496 | v=0 | [RFC4566] | 1497 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 1498 | s=- | [RFC4566] | 1499 | t=0 0 | [RFC4566] | 1500 | a=msid-semantic:WMS | [MSID] | 1501 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 1502 | | dle-negotiation] Bob | 1503 | | supports BUNDLE semantics. | 1504 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1505 | c=IN IP4 98.248.92.77 | [RFC4566] | 1506 | a=msid:ma ta | Identifies RTCMediaStream | 1507 | | ID (ma) and | 1508 | | RTCMediaStreamTrack ID | 1509 | | (ta) | 1510 | a=mid:audio | [RFC5888] Audio m=line | 1511 | | part of the BUNDLE group | 1512 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 1513 | | data | 1514 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1515 | | us] | 1516 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1517 | | us] | 1518 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1519 | hdrext:ssrc-audio-level | | 1520 | a=sendrecv | [RFC3264] | 1521 | a=setup:active | [RFC4145] - Bob carries | 1522 | | out DTLS Handshake in | 1523 | | parallel | 1524 | a=rtcp-fb:109 nack | [RFC5104] | 1525 | a=rtcp-mux | [RFC5761] | 1526 | a=ssrc:33333 cname:Q/1HmN4Xa5NWs1ao | [RFC5576] | 1527 | a=ice-ufrag:c300d85b | [RFC5245] | 1528 | a=ice- | [RFC5245] | 1529 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1530 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1531 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1532 | 9:a8:07 | | 1533 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1534 | 192.168.1.7 49203 typ host | | 1535 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1536 | 98.248.92.77 49203 typ srflx raddr | | 1537 | 192.168.1.7 rport 49203 | | 1538 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1539 | 192.168.1.7 60065 typ host | | 1540 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1541 | 98.248.92.77 60065 typ srflx raddr | | 1542 | 192.168.1.7 rport 60065 | | 1543 | a=rtcp-rsize | [RFC5506] | 1544 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1545 | | -ice] | 1546 | m=video 49203 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 1547 | c=IN IP4 98.248.92.77 | [RFC4566] | 1548 | a=mid:video | [RFC5888] Video m=line | 1549 | | part of the BUNDLE group | 1550 | | with the port from audio | 1551 | | line repeated | 1552 | a=msid:ma tb | Identifies RTCMediaStream | 1553 | | ID (ma) and | 1554 | | RTCMediaStreamTrack ID | 1555 | | (tb) | 1556 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] - Port for RTCP | 1557 | | data | 1558 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 1559 | a=sendrecv | [RFC3264] | 1560 | a=setup:active | [RFC4145] - Bob carries | 1561 | | out DTLS Handshake in | 1562 | | parallel | 1563 | a=rtcp-mux | [RFC5761] | 1564 | a=ssrc:44444 cname:Q/2AqlmN4Xa5NWs | [RFC5576] | 1565 | a=ice-ufrag:85bc300d | [RFC5245] | 1566 | a=ice- | [RFC5245] | 1567 | pwd:bd2de4e9991c325921d5d47efbabd9a2 | | 1568 | a=fingerprint:sha-1 41:49:83:4a:99:9 | [RFC5245] | 1569 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1570 | 9:a8:07 | | 1571 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - Candidate | 1572 | 192.168.1.7 49203 typ host | lines identical with the | 1573 | | audio m-line. | 1574 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1575 | 98.248.92.77 49203 typ srflx raddr | | 1576 | 192.168.1.7 rport 49203 | | 1577 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1578 | 192.168.1.7 60065 typ host | | 1579 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1580 | 98.248.92.77 60065 typ srflx raddr | | 1581 | 192.168.1.7 rport 60065 | | 1582 | a=rtcp-fb:120 nack | [RFC5104] | 1583 | a=rtcp-fb:120 nack pli | [RFC5104] | 1584 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1585 | a=rtcp-rsize | [RFC5506] | 1586 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1587 | | -ice] | 1588 +--------------------------------------+----------------------------+ 1590 Table 14: 5.2.7 SDP Answer w/BUNDLE 1592 +--------------------------------------+----------------------------+ 1593 | SDP Contents | RFC#/Notes | 1594 +--------------------------------------+----------------------------+ 1595 | v=0 | [RFC4566] | 1596 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1597 | s=- | [RFC4566] | 1598 | t=0 0 | [RFC4566] | 1599 | a=msid-semantic:WMS | [MSID] | 1600 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 1601 | | dle-negotiation] | 1602 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1603 | c=IN IP4 24.23.204.141 | [RFC4566] | 1604 | a=msid:ma ta | Identifies RTCMediaStream | 1605 | | ID (ma) and | 1606 | | RTCMediaStreamTrack ID | 1607 | | (ta) | 1608 | a=mid:audio | [RFC5888] - Port number | 1609 | | finalized as Bundle | 1610 | | Address. | 1611 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 1612 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1613 | | us] | 1614 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1615 | hdrext:ssrc-audio-level | | 1616 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1617 | | us] | 1618 | a=sendrecv | [RFC3264] | 1619 | a=setup:actpass | [RFC4145] - Alice can | 1620 | | perform DTLS before Answer | 1621 | | arrives | 1622 | a=rtcp-mux | [RFC5761] | 1623 | a=ssrc:11111 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 1624 | a=ice-ufrag:074c6550 | [RFC5245] | 1625 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1626 | f08a068 | | 1627 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1628 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1629 | 9:a8:07 | | 1630 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1631 | 192.168.1.4 54609 typ host | | 1632 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1633 | 24.23.204.141 54609 typ srflx raddr | | 1634 | 192.168.1.4 rport 54609 | | 1635 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1636 | 192.168.1.4 64678 typ host | | 1637 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1638 | 24.23.204.141 64678 typ srflx raddr | | 1639 | 192.168.1.4 rport 64678 | | 1640 | a=rtcp-fb:109 nack | [RFC5104] | 1641 | a=rtcp-rsize | [RFC5506] | 1642 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1643 | | -ice] | 1644 | m=video 54609 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 1645 | c=IN IP4 24.23.204.141 | [RFC4566] | 1646 | a=msid:ma tb | Identifies RTCMediaStream | 1647 | | ID (ma) and | 1648 | | RTCMediaStreamTrack ID | 1649 | | (tb) | 1650 | a=mid:video | [RFC5888] - Same Bundle | 1651 | | address from the audio | 1652 | | m=line | 1653 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 1654 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 1655 | a=sendrecv | [RFC3264] | 1656 | a=setup:actpass | [RFC4145] - Alice can | 1657 | | perform DTLS before Answer | 1658 | | arrives | 1659 | a=rtcp-mux | [RFC5761] | 1660 | a=ssrc:22222 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 1661 | a=ice-ufrag:074c6550 | [RFC5245] | 1662 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1663 | f08a068 | | 1664 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1665 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1666 | 9:a8:07 | | 1667 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1668 | 192.168.1.4 54609 typ host | | 1669 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1670 | 24.23.204.141 54609 typ srflx raddr | | 1671 | 192.168.1.4 rport 54609 | | 1672 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1673 | 192.168.1.4 64678 typ host | | 1674 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1675 | 24.23.204.141 64678 typ srflx raddr | | 1676 | 192.168.1.4 rport 64678 | | 1677 | a=rtcp-fb:120 nack | [RFC5104] | 1678 | a=rtcp-fb:120 nack pli | [RFC5104] | 1679 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1680 | a=rtcp-rsize | [RFC5506] | 1681 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1682 | | -ice] | 1683 +--------------------------------------+----------------------------+ 1685 Table 15: 5.2.7 SDP Offer for BAS 1687 5.2.8. Audio, Video and Data Session 1689 This example show-cases SDP for negotiating a session with Audio, 1690 Video and data streams between Alice and Bob with 1691 [draft-ietf-mmusic-sdp-bundle-negotiation] support known 1693 title Audio, Video, Data with BUNDLE support known 1695 Alice->Bob: Offer(Audio:Opus, Video:VP8, Data) 1696 note right of Alice 1697 Alice indicates BUNDLE support with identical address across all the m=lines. 1698 end note 1700 Bob->Alice: Answer(Audio:Opus Video:VP8, Data) 1701 note left of Bob 1702 Bob does the same 1703 end note 1704 Alice<->Bob: Two way Audio, Video and Data multiplexed 1706 +--------------------------------------+----------------------------+ 1707 | SDP Contents | RFC#/Notes | 1708 +--------------------------------------+----------------------------+ 1709 | v=0 | [RFC4566] | 1710 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1711 | s=- | [RFC4566] | 1712 | t=0 0 | [RFC4566] | 1713 | a=msid-semantic:WMS | [MSID] | 1714 | a=group:BUNDLE audio video data | [draft-ietf-mmusic-sdp-bun | 1715 | | dle-negotiation] | 1716 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1717 | c=IN IP4 24.23.204.141 | [RFC4566] | 1718 | a=msid:ma ta | Identifies RTCMediaStream | 1719 | | ID (ma) and | 1720 | | RTCMediaStreamTrack ID | 1721 | | (ta) | 1722 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 1723 | a=mid:audio | [RFC5888] | 1724 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1725 | | us] | 1726 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1727 | hdrext:ssrc-audio-level | | 1728 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1729 | | us] | 1730 | a=sendrecv | [RFC3264] | 1731 | a=setup:actpass | [RFC4145] | 1732 | a=rtcp-mux | [RFC5761] | 1733 | a=ice-ufrag:074c6550 | [RFC5245] | 1734 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1735 | f08a068 | | 1736 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1737 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1738 | 9:a8:07 | | 1739 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1740 | 192.168.1.4 54609 typ host | | 1741 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1742 | 24.23.204.141 54609 typ srflx raddr | | 1743 | 192.168.1.4 rport 54609 | | 1744 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1745 | 192.168.1.4 64678 typ host | | 1746 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1747 | 24.23.204.141 64678 typ srflx raddr | | 1748 | 192.168.1.4 rport 64678 | | 1749 | a=rtcp-fb:109 nack | [RFC5104] | 1750 | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 1751 | a=rtcp-rsize | [RFC5506] | 1752 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1753 | | -ice] | 1754 | m=video 54609 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 1755 | c=IN IP4 24.23.204.141 | [RFC4566] | 1756 | a=msid:ma tb | Identifies RTCMediaStream | 1757 | | ID (ma) and | 1758 | | RTCMediaStreamTrack ID | 1759 | | (tb) | 1760 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 1761 | a=mid:video | [RFC5888] | 1762 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 1763 | a=sendrecv | [RFC3264] | 1764 | a=setup:actpass | [RFC4145] | 1765 | a=rtcp-mux | [RFC5761] | 1766 | a=ice-ufrag:074c6550 | [RFC5245] | 1767 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1768 | f08a068 | | 1769 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1770 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1771 | 9:a8:07 | | 1772 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1773 | 192.168.1.4 54609 typ host | | 1774 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1775 | 24.23.204.141 54609 typ srflx raddr | | 1776 | 192.168.1.4 rport 54609 | | 1777 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1778 | 192.168.1.4 64678 typ host | | 1779 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1780 | 24.23.204.141 64678 typ srflx raddr | | 1781 | 192.168.1.4 rport 64678 | | 1782 | a=rtcp-fb:120 nack | [RFC5104] | 1783 | a=rtcp-fb:120 nack pli | [RFC5104] | 1784 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1785 | a=ssrc:22222 cname:Q/aoNWs11HmN4Xa5 | [RFC5576] | 1786 | a=rtcp-rsize | [RFC5506] | 1787 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1788 | | -ice] | 1789 | m=application 54609 DTLS/SCTP 5000 | [draft-ietf-rtcweb-data-ch | 1790 | | annel] | 1791 | c=IN IP4 24.23.204.141 | [RFC4566] | 1792 | a=mid:data | [RFC5888] | 1793 | a=sctpmap:5000 webrtc-DataChannel | [draft-ietf-mmusic-sctp-sd | 1794 | streams=1;label="channel | p] | 1795 | 1";subprotocol="chat"; | | 1796 | a=sendrecv | [RFC3264] | 1797 | a=setup:actpass | [RFC4145] | 1798 | a=ice-ufrag:074c6550 | [RFC5245] | 1799 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1800 | f08a068 | | 1801 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1802 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1803 | 9:a8:07 | | 1804 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1805 | 192.168.1.4 54609 typ host | | 1806 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1807 | 24.23.204.141 54609 typ srflx raddr | | 1808 | 192.168.1.4 rport 54609 | | 1809 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1810 | | -ice] | 1811 +--------------------------------------+----------------------------+ 1813 Table 16: 5.2.8 SDP Offer 1815 +--------------------------------------+----------------------------+ 1816 | SDP Contents | RFC#/Notes | 1817 +--------------------------------------+----------------------------+ 1818 | v=0 | [RFC4566] | 1819 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 1820 | | Information | 1821 | s=- | [RFC4566] | 1822 | t=0 0 | [RFC4566] | 1823 | a=msid-semantic:WMS | [MSID] | 1824 | a=group:BUNDLE audio video data | [draft-ietf-mmusic-sdp-bun | 1825 | | dle-negotiation] | 1826 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1827 | | -ice] Bob's trickle | 1828 | | support support is | 1829 | | indicated at the session | 1830 | | level | 1831 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1832 | c=IN IP4 98.248.92.77 | [RFC4566] | 1833 | a=msid:ma ta | Identifies RTCMediaStream | 1834 | | ID (ma) and | 1835 | | RTCMediaStreamTrack ID | 1836 | | (ta) | 1837 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 1838 | a=mid:audio | [RFC5888] | 1839 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1840 | | us] | 1841 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1842 | hdrext:ssrc-audio-level | | 1843 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1844 | | us] | 1845 | a=sendrecv | [RFC3264] | 1846 | a=setup:active | [RFC4145] | 1847 | a=rtcp-mux | [RFC5761] | 1848 | a=rtcp-fb:109 nack | [RFC5104] | 1849 | a=ice-ufrag:c300d85b | [RFC5245] | 1850 | a=ice- | [RFC5245] | 1851 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1852 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1853 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1854 | 9:a8:07 | | 1855 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1856 | 192.168.1.7 49203 typ host | | 1857 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1858 | 98.248.92.77 49203 typ srflx raddr | | 1859 | 192.168.1.7 rport 49203 | | 1860 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1861 | 192.168.1.7 60065 typ host | | 1862 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1863 | 98.248.92.77 60065 typ srflx raddr | | 1864 | 192.168.1.7 rport 60065 | | 1865 | a=ssrc:33333 cname:L/aoNWs11HmN4Xa5 | [RFC5576] | 1866 | a=rtcp-rsize | [RFC5506] | 1867 | m=video 49203 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 1868 | c=IN IP4 98.248.92.77 | [RFC4566] | 1869 | a=msid:ma tb | Identifies RTCMediaStream | 1870 | | ID (ma) and | 1871 | | RTCMediaStreamTrack ID | 1872 | | (tb) | 1873 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 1874 | a=mid:video | [RFC5888] | 1875 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 1876 | a=sendrecv | [RFC3264] | 1877 | a=setup:active | [RFC4145] | 1878 | a=rtcp-mux | [RFC5761] | 1879 | a=ice-ufrag:c300d85b | [RFC5245] | 1880 | a=ice- | [RFC5245] | 1881 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1882 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1883 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1884 | 9:a8:07 | | 1885 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1886 | 192.168.1.7 49203 typ host | | 1887 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1888 | 98.248.92.77 49203 typ srflx raddr | | 1889 | 192.168.1.7 rport 49203 | | 1890 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1891 | 192.168.1.7 60065 typ host | | 1892 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1893 | 98.248.92.77 60065 typ srflx raddr | | 1894 | 192.168.1.7 rport 60065 | | 1895 | a=rtcp-fb:120 nack | [RFC5104] | 1896 | a=rtcp-fb:120 nack pli | [RFC5104] | 1897 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1898 | a=ssrc:44444 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 1899 | a=rtcp-rsize | [RFC5506] | 1900 | m=application 49203 DTLS/SCTP 5000 | [draft-ietf-mmusic-sctp-sd | 1901 | | p] | 1902 | c=IN IP4 98.248.92.771 | [RFC4566] | 1903 | a=mid:data | [RFC5888] | 1904 | a=sctpmap:5000 webrtc-DataChannel | [draft-ietf-mmusic-sctp-sd | 1905 | streams=16;label="channel | p] | 1906 | 1";subprotocol="chat"; | | 1907 | a=setup:active | [RFC4145] | 1908 | a=sendrecv | [RFC3264] | 1909 | a=ice-ufrag:c300d85b | [RFC5245] | 1910 | a=ice- | [RFC5245] | 1911 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 1912 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1913 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1914 | 9:a8:07 | | 1915 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1916 | 192.168.1.7 49203 typ host | | 1917 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1918 | 98.248.92.77 49203 typ srflx raddr | | 1919 | 192.168.1.7 rport 49203 | | 1920 +--------------------------------------+----------------------------+ 1922 Table 17: 5.2.8 SDP Answer 1924 5.2.9. Two-Way Audio,Video w/BUNDLE Unsupported 1926 This use-case illustrates SDP Offer/Answer exchange when the far-end 1927 (Bob) either doesn't support media bundling or doesn't want to group 1928 m=lines over a single 5-tuple. 1930 On successful Offer/Answer exchange, Alice and Bob each end up using 1931 unique 5-tuple for audio and video media streams respectively. 1933 title 2-Way Secure Audio,Video with BUNDLE Unsupported 1935 Alice->Bob: Offer(Audio:Opus Video:VP8) 1936 note right of Alice 1937 Alice offers BUNDLE support with unique address for the audio and video m-line 1938 end note 1940 Bob->Alice: Answer(Audio:Opus Video:VP8) 1941 note left of Bob 1942 Bob uses unique addresses as well since he doesn't understand BUNDLE 1943 end note 1945 Alice <-> Bob: 2Way Call with Audio and Video on different addresses. 1947 +--------------------------------------+----------------------------+ 1948 | SDP Contents | RFC#/Notes | 1949 +--------------------------------------+----------------------------+ 1950 | v=0 | [RFC4566] | 1951 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1952 | s=- | [RFC4566] | 1953 | t=0 0 | [RFC4566] | 1954 | a=msid-semantic:WMS | [MSID] | 1955 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 1956 | | dle-negotiation] Alice | 1957 | | supports grouping of | 1958 | | m=lines under BUNDLE | 1959 | | semantics | 1960 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 1961 | | -ice] | 1962 | m=audio 55232 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 1963 | c=IN IP4 24.23.204.141 | [RFC4566] | 1964 | a=msid:ma ta | Identifies RTCMediaStream | 1965 | | ID (ma) and | 1966 | | RTCMediaStreamTrack ID | 1967 | | (ta) | 1968 | a=mid:audio | [RFC5888] Audio m=line | 1969 | | part of BUNDLE group with | 1970 | | a unique port number | 1971 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 1972 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 1973 | | us] | 1974 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1975 | hdrext:ssrc-audio-level | | 1976 | a=ptime:20 | [draft-ietf-payload-rtp-op | 1977 | | us] | 1978 | a=setup:actpass | [RFC4145] - Alice can | 1979 | | perform DTLS before Answer | 1980 | | arrives | 1981 | a=sendrecv | [RFC3264] | 1982 | a=rtcp-mux | [RFC5761] | 1983 | a=rtcp-fb:109 nack | [RFC5104] | 1984 | a=ssrc:11111 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 1985 | a=ice-ufrag:074c6550 | [RFC5245] | 1986 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 1987 | f08a068 | | 1988 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 1989 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 1990 | 9:a8:07 | | 1991 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1992 | 192.168.1.4 55232 typ host | | 1993 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 1994 | 24.23.204.141 55232 typ srflx raddr | | 1995 | 192.168.1.4 rport 55232 | | 1996 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 1997 | 192.168.1.4 64678 typ host | | 1998 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 1999 | 24.23.204.141 64678 typ srflx raddr | | 2000 | 192.168.1.4 rport 64678 | | 2001 | a=rtcp-rsize | [RFC5506] | 2002 | m=video 54332 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 2003 | c=IN IP4 24.23.204.141 | [RFC4566] | 2004 | a=msid:ma tb | Identifies RTCMediaStream | 2005 | | ID (ma) and | 2006 | | RTCMediaStreamTrack ID | 2007 | | (tb) | 2008 | a=mid:video | [RFC5888] Video m=line | 2009 | | part of the BUNDLE group | 2010 | | with a unique port number | 2011 | a=rtcp:54721 IN IP4 24.23.204.141 | [RFC3605] | 2012 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 2013 | a=sendrecv | [RFC3264] | 2014 | a=setup:actpass | [RFC4145] - Alice can | 2015 | | perform DTLS before Answer | 2016 | | arrives | 2017 | a=rtcp-mux | [RFC5761] | 2018 | a=ssrc:22222 cname:yvY7/EocUG1f0fcg | [RFC5576] | 2019 | a=ice-ufrag:7872093 | [RFC5245] | 2020 | a=ice-pwd:ee3474af08a068a28a397a4c3f | [RFC5245] | 2021 | 31747d1 | | 2022 | a=fingerprint:sha-1 6d:f7:c9:c7:70:9 | [RFC5245] | 2023 | d:1f:66:79:a8:07:99:41:49:83:4a:97:0 | | 2024 | e:1f:ef | | 2025 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2026 | 192.168.1.4 54332 typ host | | 2027 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2028 | 24.23.204.141 54332 typ srflx raddr | | 2029 | 192.168.1.4 rport 54332 | | 2030 | a=candidate:0 2 2113667326 | [RFC5245] | 2031 | 192.168.1.4 54721 typ host | | 2032 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2033 | 24.23.204.141 54721 typ srflx raddr | | 2034 | 192.168.1.4 rport 54721 | | 2035 | a=rtcp-fb:120 nack | [RFC5104] | 2036 | a=rtcp-fb:120 nack pli | [RFC5104] | 2037 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2038 | a=rtcp-rsize | [RFC5506] | 2039 +--------------------------------------+----------------------------+ 2041 Table 18: 5.2.9 SDP Offer w/BUNDLE 2043 +------------------------------------------+------------------------+ 2044 | SDP Contents | RFC#/Notes | 2045 +------------------------------------------+------------------------+ 2046 | v=0 | [RFC4566] | 2047 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 2048 | s=- | [RFC4566] | 2049 | t=0 0 | [RFC4566] | 2050 | a=msid-semantic:WMS | [MSID] | 2051 | a=ice-options:trickle | [draft-ivov-mmusic-tri | 2052 | | ckle-ice] | 2053 | m=audio 53214 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2054 | c=IN IP4 98.248.92.77 | [RFC4566] | 2055 | a=msid:ma ta | Identifies | 2056 | | RTCMediaStream ID (ma) | 2057 | | and | 2058 | | RTCMediaStreamTrack ID | 2059 | | (ta) | 2060 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2061 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rt | 2062 | | p-opus] | 2063 | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | 2064 | :ssrc-audio-level | | 2065 | a=ptime:20 | [draft-ietf-payload-rt | 2066 | | p-opus] | 2067 | a=setup:active | [RFC4145] - Bob | 2068 | | carries out DTLS | 2069 | | Handshake in parallel | 2070 | a=sendrecv | [RFC3264] | 2071 | a=rtcp-fb:109 nack | [RFC5104] | 2072 | a=ice-ufrag:c300d85b | [RFC5245] | 2073 | a=ice- | [RFC5245] | 2074 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2075 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e | [RFC5245] | 2076 | :1f:ef:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 2077 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2078 | 192.168.1.7 53214 typ host | | 2079 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2080 | 98.248.92.77 53214 typ srflx raddr | | 2081 | 192.168.1.7 rport 53214 | | 2082 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2083 | 192.168.1.7 60065 typ host | | 2084 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2085 | 98.248.92.77 60065 typ srflx raddr | | 2086 | 192.168.1.7 rport 60065 | | 2087 | a=rtcp-rsize | [RFC5506] | 2088 | m=video 58679 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 2089 | c=IN IP4 98.248.92.77 | [RFC4566] | 2090 | a=msid:ma tb | Identifies | 2091 | | RTCMediaStream ID (ma) | 2092 | | and | 2093 | | RTCMediaStreamTrack ID | 2094 | | (tb) | 2095 | a=rtcp:56507 IN IP4 98.248.92.77 | [RFC3605] | 2096 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp | 2097 | | 8] | 2098 | a=setup:active | [RFC4145] - Bob | 2099 | | carries out DTLS | 2100 | | Handshake in parallel | 2101 | a=sendrecv | [RFC3264] | 2102 | a=ice-ufrag:85bC300 | [RFC5245] | 2103 | a=ice- | [RFC5245] | 2104 | pwd:325921d5d47efbabd9a2de4e99bd291c | | 2105 | a=fingerprint:sha-1 9d:1f:66:79:a8:07:99 | [RFC5245] | 2106 | :41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7:70 | | 2107 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2108 | 192.168.1.7 58679 typ host | | 2109 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2110 | 98.248.92.77 58679 typ srflx raddr | | 2111 | 192.168.1.7 rport 58679 | | 2112 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2113 | 192.168.1.7 56607 typ host | | 2114 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2115 | 98.248.92.77 56607 typ srflx raddr | | 2116 | 192.168.1.7 rport 56607 | | 2117 | a=rtcp-fb:120 nack | [RFC5104] | 2118 | a=rtcp-fb:120 nack pli | [RFC5104] | 2119 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2120 | a=rtcp-rsize | [RFC5506] | 2121 +------------------------------------------+------------------------+ 2123 Table 19: 5.2.9 SDP Answer without BUNDLE 2125 5.2.10. Audio, Video BUNDLED but Data Not BUNDLED 2127 This example show-cases SDP for negotiating a session with Audio, 2128 Video and data streams between Alice and Bob but with data stream not 2129 part of the BUNDLE group. This is shown by assigning unique port for 2130 data media sections. 2132 title Audio, Video, with Data out of BUNDLE 2133 Alice->Bob: Offer(Audio:Opus, Video:VP8, Data (Not in BUNDLE) 2134 note right of Alice 2135 Alice wants to multiplex audio, video but not data 2136 end note 2138 Bob->Alice: Answer(Audio:Opus Video:VP8, Data) 2139 note left of Bob 2140 Bob does the same 2141 end note 2142 Alice<->Bob: Two way Audio, Video multiplexed except Data 2144 +--------------------------------------+----------------------------+ 2145 | SDP Contents | RFC#/Notes | 2146 +--------------------------------------+----------------------------+ 2147 | v=0 | [RFC4566] | 2148 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 2149 | s=- | [RFC4566] | 2150 | t=0 0 | [RFC4566] | 2151 | a=msid-semantic:WMS | [MSID] | 2152 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 2153 | | dle-negotiation] Alice | 2154 | | wants to BUNDLE only audio | 2155 | | and video media. | 2156 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2157 | | -ice] | 2158 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2159 | c=IN IP4 24.23.204.141 | [RFC4566] | 2160 | a=msid:ma ta | Identifies RTCMediaStream | 2161 | | ID (ma) and | 2162 | | RTCMediaStreamTrack ID | 2163 | | (ta) | 2164 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2165 | a=mid:audio | [RFC5888] | 2166 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2167 | | us] | 2168 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2169 | hdrext:ssrc-audio-level | | 2170 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2171 | | us] | 2172 | a=sendrecv | [RFC3264] | 2173 | a=setup:actpass | [RFC4145] | 2174 | a=rtcp-mux | [RFC5761] | 2175 | a=ice-ufrag:074c6550 | [RFC5245] | 2176 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 2177 | f08a068 | | 2178 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2179 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2180 | 9:a8:07 | | 2181 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2182 | 192.168.1.4 54609 typ host | | 2183 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2184 | 24.23.204.141 54609 typ srflx raddr | | 2185 | 192.168.1.4 rport 54609 | | 2186 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2187 | 192.168.1.4 64678 typ host | | 2188 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2189 | 24.23.204.141 64678 typ srflx raddr | | 2190 | 192.168.1.4 rport 64678 | | 2191 | a=rtcp-fb:109 nack | [RFC5104] | 2192 | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 2193 | a=rtcp-rsize | [RFC5506] | 2194 | m=video 54609 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 2195 | c=IN IP4 24.23.204.141 | [RFC4566] | 2196 | a=msid:ma tb | Identifies RTCMediaStream | 2197 | | ID (ma) and | 2198 | | RTCMediaStreamTrack ID | 2199 | | (tb) | 2200 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2201 | a=mid:video | [RFC5888] | 2202 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 2203 | a=sendrecv | [RFC3264] | 2204 | a=setup:actpass | [RFC4145] | 2205 | a=rtcp-mux | [RFC5761] | 2206 | a=ice-ufrag:074c6550 | [RFC5245] | 2207 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 2208 | f08a068 | | 2209 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2210 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2211 | 9:a8:07 | | 2212 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2213 | 192.168.1.4 54609 typ host | | 2214 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2215 | 24.23.204.141 54609 typ srflx raddr | | 2216 | 192.168.1.4 rport 54609 | | 2217 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2218 | 192.168.1.4 64678 typ host | | 2219 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2220 | 24.23.204.141 64678 typ srflx raddr | | 2221 | 192.168.1.4 rport 64678 | | 2222 | a=rtcp-fb:120 nack | [RFC5104] | 2223 | a=rtcp-fb:120 nack pli | [RFC5104] | 2224 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2225 | a=ssrc:22222 cname:Q/aoNWs11HmN4Xa5 | [RFC5576] | 2226 | a=rtcp-rsize | [RFC5506] | 2227 | m=application 10000 DTLS/SCTP 5000 | [draft-ietf-rtcweb-data-ch | 2228 | | annel] | 2229 | c=IN IP4 24.23.204.141 | [RFC4566] | 2230 | a=mid:data | [RFC5888] | 2231 | a=sctpmap:5000 webrtc-DataChannel | [draft-ietf-mmusic-sctp-sd | 2232 | streams=16;label="channel | p] | 2233 | 1";subprotocol="chat"; | | 2234 | a=sendrecv | [RFC3264] | 2235 | a=setup:actpass | [RFC4145] | 2236 | a=ice-ufrag:89819013 | [RFC5245] | 2237 | a=ice-pwd:1747d1ee3474af08a068a28a39 | [RFC5245] | 2238 | 7a4c3f3 | | 2239 | a=fingerprint:sha-1 0e:1f:ef:6d:f7:c | [RFC5245] | 2240 | 9:c7:70:99:41:49:83:4a:97:9d:1f:66:7 | | 2241 | 9:a8:07 | | 2242 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2243 | 192.168.1.4 10000 typ host | | 2244 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2245 | 24.23.204.141 10000 typ srflx raddr | | 2246 | 192.168.1.4 rport 10000 | | 2247 +--------------------------------------+----------------------------+ 2249 Table 20: 5.2.10 SDP Offer 2251 +--------------------------------------+----------------------------+ 2252 | SDP Contents | RFC#/Notes | 2253 +--------------------------------------+----------------------------+ 2254 | v=0 | [RFC4566] | 2255 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 2256 | | Information | 2257 | s=- | [RFC4566] | 2258 | t=0 0 | [RFC4566] | 2259 | a=msid-semantic:WMS | [MSID] | 2260 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 2261 | | dle-negotiation] | 2262 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2263 | | -ice] | 2264 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2265 | c=IN IP4 98.248.92.77 | [RFC4566] | 2266 | a=msid:ma ta | Identifies RTCMediaStream | 2267 | | ID (ma) and | 2268 | | RTCMediaStreamTrack ID | 2269 | | (ta) | 2270 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2271 | a=mid:audio | [RFC5888] | 2272 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2273 | | us] | 2274 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2275 | hdrext:ssrc-audio-level | | 2276 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2277 | | us] | 2278 | a=sendrecv | [RFC3264] | 2279 | a=setup:active | [RFC4145] | 2280 | a=rtcp-mux | [RFC5761] | 2281 | a=rtcp-fb:109 nack | [RFC5104] | 2282 | a=ice-ufrag:c300d85b | [RFC5245] | 2283 | a=ice- | [RFC5245] | 2284 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2285 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2286 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2287 | 9:a8:07 | | 2288 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2289 | 192.168.1.7 49203 typ host | | 2290 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2291 | 98.248.92.77 49203 typ srflx raddr | | 2292 | 192.168.1.7 rport 49203 | | 2293 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2294 | 192.168.1.7 60065 typ host | | 2295 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2296 | 98.248.92.77 60065 typ srflx raddr | | 2297 | 192.168.1.7 rport 60065 | | 2298 | a=ssrc:33333 cname:L/aoNWs11HmN4Xa5 | [RFC5576] | 2299 | a=rtcp-rsize | [RFC5506] | 2300 | m=video 49203 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 2301 | c=IN IP4 98.248.92.771 | [RFC4566] | 2302 | a=msid:ma tb | Identifies RTCMediaStream | 2303 | | ID (ma) and | 2304 | | RTCMediaStreamTrack ID | 2305 | | (tb) | 2306 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2307 | a=mid:video | [RFC5888] | 2308 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 2309 | a=sendrecv | [RFC3264] | 2310 | a=setup:active | [RFC4145] | 2311 | a=rtcp-mux | [RFC5761] | 2312 | a=ice-ufrag:c300d85b | [RFC5245] | 2313 | a=ice- | [RFC5245] | 2314 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2315 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2316 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2317 | 9:a8:07 | | 2318 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2319 | 192.168.1.7 49203 typ host | | 2320 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2321 | 98.248.92.77 49203 typ srflx raddr | | 2322 | 192.168.1.7 rport 49203 | | 2323 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2324 | 192.168.1.7 60065 typ host | | 2325 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2326 | 98.248.92.77 60065 typ srflx raddr | | 2327 | 192.168.1.7 rport 60065 | | 2328 | a=rtcp-fb:120 nack | [RFC5104] | 2329 | a=rtcp-fb:120 nack pli | [RFC5104] | 2330 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2331 | a=ssrc:44444 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 2332 | a=rtcp-rsize | [RFC5506] | 2333 | m=application 20000 DTLS/SCTP 5000 | [draft-ietf-mmusic-sctp-sd | 2334 | | p] | 2335 | c=IN IP4 98.248.92.77 | [RFC4566] | 2336 | a=mid:data | [RFC5888] | 2337 | a=sctpmap:5000 webrtc-DataChannel | [draft-ietf-mmusic-sctp-sd | 2338 | streams=1;label="channel | p] | 2339 | 1";subprotocol="chat"; | | 2340 | a=setup:active | [RFC4145] | 2341 | a=sendrecv | [RFC3264] | 2342 | a=ice-ufrag:991Ca2a5e | [RFC5245] | 2343 | a=ice- | [RFC5245] - Session Level | 2344 | pwd:921d5d47efbabd9a2de4e99bd291c325 | ICE password | 2345 | a=fingerprint:sha-1 6d:f7:c9:c7:70:9 | [RFC5245] | 2346 | d:1f:66:79:a8:07:99:41:49:83:4a:97:0 | | 2347 | e:1f:ef | | 2348 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2349 | 192.168.1.7 20000 typ host | | 2350 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2351 | 98.248.92.77 20000 typ srflx raddr | | 2352 | 192.168.1.7 rport 20000 | | 2353 +--------------------------------------+----------------------------+ 2355 Table 21: 5.2.10 SDP Answer 2357 5.2.11. Audio Only then Add Video and BUNDLE 2359 This example involves 2 Offer/Answer exchanges. First one setting up 2360 Audio-only session followed by an updated Offer/Answer exchange to 2361 add video stream to the ongoing session. Also the newly added video 2362 stream is BUNDLED with the audio stream. 2364 title Audio Only , Add Video and BUNDLE 2366 Alice->Bob: Offer(Audio:Opus) 2367 note right of Alice 2368 Alice indicates support for BUNDLE 2369 end note 2371 Bob->Alice: Answer(Audio:Opus) 2372 note left of Bob 2373 Bob also indicates support for BUNDLE 2374 end note 2375 Alice<->Bob: Two way Audio only session 2377 Alice->Bob: Updated Offer(Audio:Opus, Video:VP8) 2378 note right of Alice 2379 Alice adds video stream to BUNDLE with audio 2380 end note 2382 Bob->Alice: Updated Answer(Audio:Opus, Video:VP8) 2383 note left of Bob 2384 Bob also does the same 2385 end note 2386 Alice<->Bob: Two way Opus Audio and VP8 Video session 2388 +--------------------------------------+----------------------------+ 2389 | SDP Contents | RFC#/Notes | 2390 +--------------------------------------+----------------------------+ 2391 | v=0 | [RFC4566] | 2392 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 2393 | s=- | [RFC4566] | 2394 | t=0 0 | [RFC4566] | 2395 | a=msid-semantic:WMS | [MSID] | 2396 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 2397 | | dle-negotiation] Alice | 2398 | | wants to BUNDLE only audio | 2399 | | and video media. | 2400 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2401 | | -ice] | 2402 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2403 | c=IN IP4 24.23.204.141 | [RFC4566] | 2404 | a=msid:ma ta | Identifies RTCMediaStream | 2405 | | ID (ma) and | 2406 | | RTCMediaStreamTrack ID | 2407 | | (ta) | 2408 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2409 | a=mid:audio | [RFC5888] | 2410 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2411 | | us] | 2412 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2413 | hdrext:ssrc-audio-level | | 2414 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2415 | | us] | 2416 | a=sendrecv | [RFC3264] | 2417 | a=setup:actpass | [RFC4145] | 2418 | a=rtcp-mux | [RFC5761] | 2419 | a=ice-ufrag:074c6550 | [RFC5245] | 2420 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 2421 | f08a068 | | 2422 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2423 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2424 | 9:a8:07 | | 2425 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2426 | 192.168.1.4 54609 typ host | | 2427 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2428 | 24.23.204.141 54609 typ srflx raddr | | 2429 | 192.168.1.4 rport 54609 | | 2430 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2431 | 192.168.1.4 64678 typ host | | 2432 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2433 | 24.23.204.141 64678 typ srflx raddr | | 2434 | 192.168.1.4 rport 64678 | | 2435 | a=rtcp-fb:109 nack | [RFC5104] | 2436 | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 2437 | a=rtcp-rsize | [RFC5506] | 2438 +--------------------------------------+----------------------------+ 2440 Table 22: 5.2.11 SDP Offer 2442 +--------------------------------------+----------------------------+ 2443 | SDP Contents | RFC#/Notes | 2444 +--------------------------------------+----------------------------+ 2445 | v=0 | [RFC4566] | 2446 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 2447 | | Information | 2448 | s=- | [RFC4566] | 2449 | t=0 0 | [RFC4566] | 2450 | a=msid-semantic:WMS | [MSID] | 2451 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 2452 | | dle-negotiation] | 2453 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2454 | | -ice] | 2455 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2456 | c=IN IP4 98.248.92.77 | [RFC4566] | 2457 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2458 | hdrext:ssrc-audio-level | | 2459 | a=msid:ma ta | Identifies RTCMediaStream | 2460 | | ID (ma) and | 2461 | | RTCMediaStreamTrack ID | 2462 | | (ta) | 2463 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2464 | a=mid:audio | [RFC5888] | 2465 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2466 | | us] | 2467 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2468 | | us] | 2469 | a=sendrecv | [RFC3264] | 2470 | a=setup:active | [RFC4145] | 2471 | a=rtcp-mux | [RFC5761] | 2472 | a=rtcp-fb:109 nack | [RFC5104] | 2473 | a=ice-ufrag:c300d85b | [RFC5245] | 2474 | a=ice- | [RFC5245] | 2475 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2476 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2477 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2478 | 9:a8:07 | | 2479 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2480 | 192.168.1.7 49203 typ host | | 2481 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2482 | 98.248.92.77 49203 typ srflx raddr | | 2483 | 192.168.1.7 rport 49203 | | 2484 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2485 | 192.168.1.7 60065 typ host | | 2486 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2487 | 98.248.92.77 60065 typ srflx raddr | | 2488 | 192.168.1.7 rport 60065 | | 2489 | a=ssrc:33333 cname:L/aoNWs11HmN4Xa5 | [RFC5576] | 2490 | a=rtcp-rsize | [RFC5506] | 2491 +--------------------------------------+----------------------------+ 2493 Table 23: 5.2.10 SDP Answer 2495 +--------------------------------------+----------------------------+ 2496 | SDP Contents | RFC#/Notes | 2497 +--------------------------------------+----------------------------+ 2498 | v=1 | Version number incremented | 2499 | | [RFC4566] | 2500 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 2501 | s=- | [RFC4566] | 2502 | t=0 0 | [RFC4566] | 2503 | a=msid-semantic:WMS | [MSID] | 2504 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 2505 | | dle-negotiation] Alice | 2506 | | wants to BUNDLE only audio | 2507 | | and video media. | 2508 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2509 | | -ice] | 2510 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2511 | c=IN IP4 24.23.204.141 | [RFC4566] | 2512 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2513 | hdrext:ssrc-audio-level | | 2514 | a=msid:ma ta | Identifies RTCMediaStream | 2515 | | ID (ma) and | 2516 | | RTCMediaStreamTrack ID | 2517 | | (ta) | 2518 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2519 | a=mid:audio | [RFC5888] | 2520 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2521 | | us] | 2522 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2523 | | us] | 2524 | a=sendrecv | [RFC3264] | 2525 | a=setup:actpass | [RFC4145] | 2526 | a=rtcp-mux | [RFC5761] | 2527 | a=ice-ufrag:074c6550 | [RFC5245] | 2528 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 2529 | f08a068 | | 2530 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2531 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2532 | 9:a8:07 | | 2533 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2534 | 192.168.1.4 54609 typ host | | 2535 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2536 | 24.23.204.141 54609 typ srflx raddr | | 2537 | 192.168.1.4 rport 54609 | | 2538 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2539 | 192.168.1.4 64678 typ host | | 2540 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2541 | 24.23.204.141 64678 typ srflx raddr | | 2542 | 192.168.1.4 rport 64678 | | 2543 | a=rtcp-fb:109 nack | [RFC5104] | 2544 | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 2545 | a=rtcp-rsize | [RFC5506] | 2546 | m=video 54609 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 2547 | c=IN IP4 24.23.204.141 | [RFC4566] | 2548 | a=msid:ma tb | Identifies RTCMediaStream | 2549 | | ID (ma) and | 2550 | | RTCMediaStreamTrack ID | 2551 | | (tb) | 2552 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2553 | a=mid:video | [RFC5888] | 2554 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 2555 | a=sendrecv | [RFC3264] | 2556 | a=setup:actpass | [RFC4145] | 2557 | a=rtcp-mux | [RFC5761] | 2558 | a=ice-ufrag:074c6550 | [RFC5245] | 2559 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 2560 | f08a068 | | 2561 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2562 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2563 | 9:a8:07 | | 2564 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2565 | 192.168.1.4 54609 typ host | | 2566 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2567 | 24.23.204.141 54609 typ srflx raddr | | 2568 | 192.168.1.4 rport 54609 | | 2569 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2570 | 192.168.1.4 64678 typ host | | 2571 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2572 | 24.23.204.141 64678 typ srflx raddr | | 2573 | 192.168.1.4 rport 64678 | | 2574 | a=rtcp-fb:120 nack | [RFC5104] | 2575 | a=rtcp-fb:120 nack pli | [RFC5104] | 2576 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2577 | a=ssrc:22222 cname:Q/aoNWs11HmN4Xa5 | [RFC5576] | 2578 | a=rtcp-rsize | [RFC5506] | 2579 +--------------------------------------+----------------------------+ 2581 Table 24: 5.2.11 SDP Updated Offer 2583 +--------------------------------------+----------------------------+ 2584 | SDP Contents | RFC#/Notes | 2585 +--------------------------------------+----------------------------+ 2586 | v=1 | [RFC4566] Version number | 2587 | | incremented | 2588 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 2589 | | Information | 2590 | s=- | [RFC4566] | 2591 | t=0 0 | [RFC4566] | 2592 | a=msid-semantic:WMS | [MSID] | 2593 | a=group:BUNDLE audio video | [draft-ietf-mmusic-sdp-bun | 2594 | | dle-negotiation] | 2595 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2596 | | -ice] | 2597 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2598 | c=IN IP4 98.248.92.77 | [RFC4566] | 2599 | a=msid:ma ta | Identifies RTCMediaStream | 2600 | | ID (ma) and | 2601 | | RTCMediaStreamTrack ID | 2602 | | (ta) | 2603 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2604 | a=mid:audio | [RFC5888] | 2605 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2606 | | us] | 2607 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2608 | hdrext:ssrc-audio-level | | 2609 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2610 | | us] | 2611 | a=sendrecv | [RFC3264] | 2612 | a=setup:active | [RFC4145] | 2613 | a=rtcp-mux | [RFC5761] | 2614 | a=rtcp-fb:109 nack | [RFC5104] | 2615 | a=ice-ufrag:c300d85b | [RFC5245] | 2616 | a=ice- | [RFC5245] | 2617 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2618 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2619 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2620 | 9:a8:07 | | 2621 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2622 | 192.168.1.7 49203 typ host | | 2623 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2624 | 98.248.92.77 49203 typ srflx raddr | | 2625 | 192.168.1.7 rport 49203 | | 2626 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2627 | 192.168.1.7 60065 typ host | | 2628 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2629 | 98.248.92.77 60065 typ srflx raddr | | 2630 | 192.168.1.7 rport 60065 | | 2631 | a=ssrc:33333 cname:L/aoNWs11HmN4Xa5 | [RFC5576] | 2632 | a=rtcp-rsize | [RFC5506] | 2633 | m=video 49203 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 2634 | c=IN IP4 98.248.92.77 | [RFC4566] | 2635 | a=msid:ma tb | Identifies RTCMediaStream | 2636 | | ID (ma) and | 2637 | | RTCMediaStreamTrack ID | 2638 | | (tb) | 2639 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2640 | a=mid:video | [RFC5888] | 2641 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload-vp8] | 2642 | a=sendrecv | [RFC3264] | 2643 | a=setup:active | [RFC4145] | 2644 | a=rtcp-mux | [RFC5761] | 2645 | a=ice-ufrag:c300d85b | [RFC5245] | 2646 | a=ice- | [RFC5245] | 2647 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2648 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2649 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2650 | 9:a8:07 | | 2651 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2652 | 192.168.1.7 49203 typ host | | 2653 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2654 | 98.248.92.77 49203 typ srflx raddr | | 2655 | 192.168.1.7 rport 49203 | | 2656 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2657 | 192.168.1.7 60065 typ host | | 2658 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2659 | 98.248.92.77 60065 typ srflx raddr | | 2660 | 192.168.1.7 rport 60065 | | 2661 | a=rtcp-fb:120 nack | [RFC5104] | 2662 | a=rtcp-fb:120 nack pli | [RFC5104] | 2663 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2664 | a=ssrc:44444 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 2665 | a=rtcp-rsize | [RFC5506] | 2666 +--------------------------------------+----------------------------+ 2668 Table 25: 5.2.11 SDP Updated Answer 2670 5.3. MultiResolution, RTX, FEC Examples 2672 This section deals with scenarios related to multiresolution 2673 negotiation such as layered coding, simulcast, along with techniques 2674 that deal with providing robustness against transmission errors such 2675 as FEC and RTX. Also to note, meachnisms such as FEC and RTX could 2676 be envisioned in the above basic scenarios as well. 2678 5.3.1. Sendonly Simulcast w/2 cameras and 2 encodings per camera 2680 This SDP below shows Offer/Answer exchange with an audio and two 2681 video streams each of which can be sent at two different resolutions. 2683 One video stream supports VP8, while the other supports H.264. 2685 bundle-only framework is used along with BUNDLE grouping framework to 2686 enable multiplexing of all the 5 streams (1 audio stream + 4 video 2687 streams) over a single RTP Session. 2689 title 1 Way Successful Simulcast w/BUNDLE 2691 note right of Alice 2692 Alice offers 2 sendonly video streams with 2 simulcast encodings per stream 2693 end note 2694 Alice->Bob: Offer(Audio:Opus,Video1:VP8,Video2:H.264) with bundle-only for video 2695 note left of Bob 2696 Bob accepts Alice's offer and 2 encodings per stream 2697 end note 2698 Alice->Bob: One-Way 1 Opus, 2 H.264 and 2 VP8 video streams, all mulitplexed 2699 +--------------------------------------+----------------------------+ 2700 | SDP Contents | RFC#/Notes | 2701 +--------------------------------------+----------------------------+ 2702 | v=0 | [RFC4566] | 2703 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 2704 | s=- | [RFC4566] | 2705 | t=0 0 | [RFC4566] | 2706 | a=msid-semantic:WMS | [MSID] | 2707 | a=group:BUNDLE m0 m1 m2 | [draft-ietf-mmusic-sdp-bun | 2708 | | dle-negotiation] Alice | 2709 | | supports grouping of | 2710 | | m=lines under BUNDLE | 2711 | | semantics | 2712 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2713 | | -ice] | 2714 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2715 | c=IN IP4 24.23.204.141 | [RFC4566] | 2716 | a=msid:ma ta | Identifies RTCMediaStream | 2717 | | ID (ma) and | 2718 | | RTCMediaStreamTrack ID | 2719 | | (ta) | 2720 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2721 | a=mid:m0 | [RFC5888] Audio m=line | 2722 | | part of BUNDLE group with | 2723 | | a unique port number | 2724 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2725 | | us] | 2726 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2727 | hdrext:ssrc-audio-level | | 2728 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2729 | | us] | 2730 | a=sendonly | [RFC3264] | 2731 | a=setup:actpass | [RFC4145] - Alice can | 2732 | | perform DTLS before Answer | 2733 | | arrives | 2734 | a=rtcp-mux | [RFC5761] | 2735 | a=rtcp-fb:109 nack | [RFC5104] | 2736 | a=ssrc:11111 EocUG1f0fcg | [RFC5576] | 2737 | a=ice-ufrag:074c6550 | [RFC5245] | 2738 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 2739 | f08a068 | | 2740 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2741 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2742 | 9:a8:07 | | 2743 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2744 | 192.168.1.4 54609 typ host | | 2745 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2746 | 24.23.204.141 54609 typ srflx raddr | | 2747 | 192.168.1.4 rport 54609 | | 2748 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2749 | 192.168.1.4 64678 typ host | | 2750 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2751 | 24.23.204.141 64678 typ srflx raddr | | 2752 | 192.168.1.4 rport 64678 | | 2753 | a=rtcp-rsize | [RFC5506] | 2754 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line | 2755 | | with port number set to | 2756 | | zero | 2757 | c=IN IP4 24.23.204.141 | [RFC4566] | 2758 | a=msid:ma tb | Identifies RTCMediaStream | 2759 | | ID (ma) and | 2760 | | RTCMediaStreamTrack ID | 2761 | | (tb) | 2762 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2763 | a=mid:m1 | [RFC5888] Video m=line | 2764 | | part of BUNDLE group | 2765 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 2766 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 2767 | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Encoding | 2768 | | -1 Resolution | 2769 | a=fmtp:98 max-fr=30 | [RFC4566] | 2770 | a=imageattr:100 [x=640,y=480] | [RFC6236] | 2771 | | Camera-1,Encoding-2 | 2772 | | Resolution | 2773 | a=fmtp:100 max-fr=15 | [RFC4566] | 2774 | a=simulcast: send 98;100 | [draft-westerlund-avtcore- | 2775 | | rtp-simulcast] | 2776 | a=ssrc:12345 cname:axzo1278npDlAzM73 | [RFC5576] [draft-rescorla- | 2777 | | avtcore-6222bis] | 2778 | | Camera-1,Encoding-1 SSRC | 2779 | | with Session CNAME | 2780 | a=ssrc:45678 cname:axzo1278npDlAzM73 | [RFC5576] [draft-rescorla- | 2781 | | avtcore-6222bis] | 2782 | | Camera-1,Encoding-2 SSRC | 2783 | | with Session CNAME | 2784 | a=sendonly | [RFC3264] - Send only | 2785 | | video stream | 2786 | a=rtcp-mux | [RFC5761] | 2787 | a=bundle-only | [draft-roach-mmusic-unifie | 2788 | | d-plan] | 2789 | a=rtcp-fb:98 nack | [RFC5104] | 2790 | a=rtcp-fb:98 nack pli | [RFC5104] | 2791 | a=rtcp-fb:98 ccm fir | [RFC5104] | 2792 | a=rtcp-fb:100 nack | [RFC5104] | 2793 | a=rtcp-fb:100 nack pli | [RFC5104] | 2794 | a=rtcp-fb:100 ccm fir | [RFC5104] | 2795 | a=rtcp-rsize | [RFC5506] | 2796 | m=video 0 UDP/TLS/RTP/SAVPF 101 102 | bundle-only video line | 2797 | | with port number set to | 2798 | | zero | 2799 | c=IN IP4 24.23.204.141 | [RFC4566] | 2800 | a=msid:ma tc | Identifies RTCMediaStream | 2801 | | ID (ma) and | 2802 | | RTCMediaStreamTrack ID | 2803 | | (tc) | 2804 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2805 | a=mid:m2 | [RFC5888] Video m=line | 2806 | | part of BUNDLE group | 2807 | a=rtpmap:101 H264/90000 | [RFC3984] | 2808 | a=rtpmap:102 H264/90000 | [RFC3984] | 2809 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding | 2810 | ;packetization-mode=1;max-fr=30 | -1 Resolution | 2811 | a=fmtp:102 profile-level-id=4d0028 | [RFC3984]Camera-1,Encoding | 2812 | ;packetization-mode=1;max-fr=15 | -2 Resolution | 2813 | a=simulcast: send 101;102 | [draft-westerlund-avtcore- | 2814 | | rtp-simulcast] | 2815 | a=ssrc:67890 cname:axzo1278npDlAzM73 | [RFC5576] [draft-rescorla- | 2816 | | avtcore-6222bis] | 2817 | | Camera-1,Encoding-1 SSRC | 2818 | | with Session CNAME | 2819 | a=ssrc:56789 cname:axzo1278npDlAzM73 | [RFC5576] [draft-rescorla- | 2820 | | avtcore-6222bis] | 2821 | | Camera-1,Encoding-2 SSRC | 2822 | | with Session CNAME | 2823 | a=sendonly | [RFC3264] - Send only | 2824 | | video stream | 2825 | a=rtcp-mux | [RFC5761] | 2826 | a=bundle-only | [draft-roach-mmusic-unifie | 2827 | | d-plan] | 2828 | a=rtcp-fb:101 nack | [RFC5104] | 2829 | a=rtcp-fb:101 nack pli | [RFC5104] | 2830 | a=rtcp-fb:101 ccm fir | [RFC5104] | 2831 | a=rtcp-fb:102 nack | [RFC5104] | 2832 | a=rtcp-fb:102 nack pli | [RFC5104] | 2833 | a=rtcp-fb:102 ccm fir | [RFC5104] | 2834 | a=rtcp-rsize | [RFC5506] | 2835 +--------------------------------------+----------------------------+ 2837 Table 26: 5.3.1 SDP Offer 2839 +--------------------------------------+----------------------------+ 2840 | SDP Contents | RFC#/Notes | 2841 +--------------------------------------+----------------------------+ 2842 | v=0 | [RFC4566] | 2843 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 2844 | s=- | [RFC4566] | 2845 | t=0 0 | [RFC4566] | 2846 | a=msid-semantic:WMS | [MSID] | 2847 | a=group:BUNDLE m0 m1 m2 | [draft-ietf-mmusic-sdp-bun | 2848 | | dle-negotiation] Alice | 2849 | | supports grouping of | 2850 | | m=lines under BUNDLE | 2851 | | semantics | 2852 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 2853 | | -ice] | 2854 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2855 | c=IN IP4 98.248.92.77 | [RFC4566] | 2856 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2857 | a=mid:m0 | [RFC5888] Audio m=line | 2858 | | part of BUNDLE group with | 2859 | | a unique port number | 2860 | a=msid:ma ta | Identifies RTCMediaStream | 2861 | | ID (ma) and | 2862 | | RTCMediaStreamTrack ID | 2863 | | (ta) | 2864 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 2865 | | us] | 2866 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2867 | hdrext:ssrc-audio-level | | 2868 | a=rtcp-fb:109 nack | [RFC5104] | 2869 | a=ptime:20 | [draft-ietf-payload-rtp-op | 2870 | | us] | 2871 | a=sendonly | [RFC3264] | 2872 | a=setup:active | [RFC4145] - Bob carries | 2873 | | out DTLS Handshake in | 2874 | | parallel | 2875 | a=rtcp-mux | [RFC5761] | 2876 | a=ssrc:22222 | [RFC5576] | 2877 | cname:y8/C90alEocUG1f0fcg | | 2878 | a=ice-ufrag:c300d85b | [RFC5245] | 2879 | a=ice- | [RFC5245] | 2880 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2881 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2882 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2883 | 9:a8:07 | | 2884 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2885 | 192.168.1.7 49203 typ host | | 2886 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2887 | 98.248.92.77 49203 typ srflx raddr | | 2888 | 192.168.1.4 rport 49203 | | 2889 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2890 | 192.168.1.7 64678 typ host | | 2891 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2892 | 98.248.92.77 60065 typ srflx raddr | | 2893 | 192.168.1.4 rport 60065 | | 2894 | a=rtcp-rsize | [RFC5506] | 2895 | m=video 49203 UDP/TLS/RTP/SAVPF 98 | BUNDLE accepted with port | 2896 | 100 | repeated from the audio | 2897 | | port | 2898 | c=IN IP4 98.248.92.77 | [RFC4566] | 2899 | a=msid:ma tb | Identifies RTCMediaStream | 2900 | | ID (ma) and | 2901 | | RTCMediaStreamTrack ID | 2902 | | (tb) | 2903 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2904 | a=mid:m1 | [RFC5888] Video m=line | 2905 | | part of BUNDLE group | 2906 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 2907 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 2908 | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Encoding | 2909 | | -1 Resolution | 2910 | a=fmtp:98 max-fr=30 | [RFC4566] | 2911 | a=imageattr:100 [x=640,y=480] | [RFC6236] | 2912 | | Camera-1,Encoding-2 | 2913 | | Resolution | 2914 | a=fmtp:100 max-fr=15 | [RFC4566] | 2915 | a=recvonly | [RFC3264] - receive only | 2916 | | video stream | 2917 | a=simulcast: recv 98;100 | [draft-westerlund-avtcore- | 2918 | | rtp-simulcast] | 2919 | a=ssrc:54321 cname:axzo1278npDlAzM73 | [RFC5576] | 2920 | a=ice-ufrag:c300d85b | [RFC5245] | 2921 | a=ice- | [RFC5245] | 2922 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2923 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2924 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2925 | 9:a8:07 | | 2926 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2927 | 192.168.1.7 49203 typ host | | 2928 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2929 | 98.248.92.77 49203 typ srflx raddr | | 2930 | 192.168.1.4 rport 49203 | | 2931 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2932 | 192.168.1.7 60065 typ host | | 2933 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2934 | 98.248.92.77 60065 typ srflx raddr | | 2935 | 192.168.1.4 rport 60065 | | 2936 | a=setup:active | [RFC4145] - Bob carries | 2937 | | out DTLS Handshake in | 2938 | | parallel | 2939 | a=rtcp-mux | [RFC5576] | 2940 | a=bundle-only | [draft-roach-mmusic-unifie | 2941 | | d-plan] | 2942 | a=rtcp-rsize | [RFC5506] | 2943 | m=video 54609 UDP/TLS/RTP/SAVPF 101 | BUNDLE accepted with port | 2944 | 102 | repeated from the audio | 2945 | | port | 2946 | c=IN IP4 98.248.92.77 | [RFC4566] | 2947 | a=rtcp:56503 IN IP4 98.248.92.77 | [RFC3605] | 2948 | a=msid:ma tc | Identifies RTCMediaStream | 2949 | | ID (ma) and | 2950 | | RTCMediaStreamTrack ID | 2951 | | (tc) | 2952 | a=mid:m2 | [RFC5888] Video m=line | 2953 | | part of BUNDLE group | 2954 | a=rtpmap:101 H264/90000 | [RFC3984] | 2955 | a=rtpmap:102 H264/90000 | [RFC3984] | 2956 | a=recvonly | [RFC3264] - Send only | 2957 | | video stream | 2958 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding | 2959 | ;packetization-mode=1;max-fr=30 | -1 Resolution | 2960 | a=fmtp:102 profile-level-id=4d0028 | [RFC3984]Camera-1,Encoding | 2961 | ;packetization-mode=1;max-fr=15 | -2 Resolution | 2962 | a=simulcast: recv 101;102 | [draft-westerlund-avtcore- | 2963 | | rtp-simulcast] | 2964 | a=ssrc:90876 cname:axzo1278npDlAzM73 | [RFC5576] | 2965 | a=ice-ufrag:ufrag:c300d85b | [RFC5245] | 2966 | a=ice- | [RFC5245] | 2967 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2968 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 2969 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 2970 | 9:a8:07 | | 2971 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2972 | 192.168.1.7 49203 typ host | | 2973 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2974 | 98.248.92.77 49203 typ srflx raddr | | 2975 | 192.168.1.7 rport 49203 | | 2976 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2977 | 192.168.1.7 60065 typ host | | 2978 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2979 | 98.248.92.77 60065 typ srflx raddr | | 2980 | 192.168.1.7 rport 60065 | | 2981 | a=setup:active | [RFC4145] - Bob carries | 2982 | | out DTLS Handshake in | 2983 | | parallel | 2984 | a=rtcp-mux | [RFC5576] | 2985 | a=bundle-only | [draft-roach-mmusic-unifie | 2986 | | d-plan] | 2987 | a=rtcp-rsize | [RFC5506] | 2988 +--------------------------------------+----------------------------+ 2990 Table 27: 5.3.1 SDP Anwer 2992 5.3.2. Successful SVC Video Stream 2994 This section shows an SDP Offer/Answer for a session with an audio 2995 and a single video stream. The video stream is layered coding at 3 2996 different resolutions based on [RFC5583]. The video m=line shows 3 2997 streams with last stream (payload 100) dependent on streams with 2998 payload 96 and 97 for decoding. 3000 title SVC Session - 3 Layers w/BUNDLE 3001 note right of Alice 3002 Alice offers 3 sendonly video stream with 3 layers of SVC 3003 end note 3004 Alice->Bob: Offer(Audio:Opus Video: H.264 SVC) bundle-only 3005 note left of Bob 3006 Bob accepts Alice's Offered Codec operation points 3007 end note 3008 Bob->Alice: Answer(Video: H.264) bundle-only 3009 Alice->Bob: One-Way H.264 Video with codec points as indicated by Bob. 3011 +---------------------------------------+---------------------------+ 3012 | SDP Contents | RFC#/Notes | 3013 +---------------------------------------+---------------------------+ 3014 | v=0 | [RFC4566] | 3015 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3016 | s=- | [RFC4566] | 3017 | t=0 0 | [RFC4566] | 3018 | a=msid-semantic:WMS | [MSID] | 3019 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bu | 3020 | | ndle-negotiation] Alice | 3021 | | supports grouping of | 3022 | | m=lines under BUNDLE | 3023 | | semantics | 3024 | a=ice-options:trickle | [draft-ivov-mmusic-trickl | 3025 | | e-ice] | 3026 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3027 | c=IN IP4 24.23.204.141 | [RFC4566] | 3028 | a=msid:ma ta | Identifies RTCMediaStream | 3029 | | ID (ma) and | 3030 | | RTCMediaStreamTrack ID | 3031 | | (ta) | 3032 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3033 | a=mid:m0 | [RFC5888] Audio m=line | 3034 | | part of BUNDLE group with | 3035 | | a unique port number | 3036 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-o | 3037 | | pus] | 3038 | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | 3039 | :ssrc-audio-level | | 3040 | a=ptime:20 | [draft-ietf-payload-rtp-o | 3041 | | pus] | 3042 | a=sendonly | [RFC3264] | 3043 | a=rtcp-fb:109 nack | [RFC5104] | 3044 | a=setup:actpass | [RFC4145] - Alice can | 3045 | | perform DTLS before | 3046 | | Answer arrives | 3047 | a=rtcp-mux | [RFC5761] | 3048 | a=ice-ufrag:074c6550 | [RFC5245] | 3049 | a=ice- | [RFC5245] | 3050 | pwd:a28a397a4c3f31747d1ee3474af08a068 | | 3051 | a=fingerprint:sha-1 99:41:49:83:4a:97 | [RFC5245] | 3052 | :0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:79: | | 3053 | a8:07 | | 3054 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3055 | 192.168.1.4 54609 typ host | | 3056 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3057 | 24.23.204.141 54609 typ srflx raddr | | 3058 | 192.168.1.4 rport 54609 | | 3059 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3060 | 192.168.1.4 64678 typ host | | 3061 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3062 | 24.23.204.141 64678 typ srflx raddr | | 3063 | 192.168.1.4 rport 64678 | | 3064 | a=ssrc:67890 cname:axzo1278npDlAzM73 | [RFC5576] | 3065 | a=rtcp-rsize | [RFC5506] | 3066 | m=video 0 UDP/TLS/RTP/SAVPF 96 97 100 | bundle-only video line | 3067 | | with port number set to | 3068 | | zero | 3069 | c=IN IP4 24.23.204.141 | [RFC4566] | 3070 | a=msid:ma tb | Identifies RTCMediaStream | 3071 | | ID (ma) and | 3072 | | RTCMediaStreamTrack ID | 3073 | | (tc) | 3074 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3075 | a=mid:m1 | [RFC5888] Audio m=line | 3076 | | part of BUNDLE group | 3077 | a=msid:ma tb | | 3078 | a=rtpmap:96 H264/90000 | [RFC3984] | 3079 | a=fmtp:96 profile-level-id=4d0028 | [RFC3984]H.264 Layer 1 | 3080 | ;packetization-mode=1;max-fr=30;max- | | 3081 | fs=8040 | | 3082 | a=rtpmap:97 H264/90000 | [RFC3984] | 3083 | a=fmtp:97 profile-level-id=4d0028 | [RFC3984] H.264 Layer 2 | 3084 | ;packetization-mode=1;max-fr=15;max- | | 3085 | fs=1200 | | 3086 | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | 3087 | a=fmtp:100 profile-level-id=4d0028 | [RFC3984] | 3088 | ;packetization-mode=1;max-fr=30;max- | | 3089 | fs=8040 | | 3090 | a=depend:100 lay m1:96,97; | [RFC5583]Layer 3 | 3091 | | dependent on layers 1 and | 3092 | | 2 | 3093 | a=sendonly | [RFC3264] - Send only | 3094 | | video stream | 3095 | a=rtcp-mux | [RFC5761] | 3096 | a=bundle-only | [draft-roach-mmusic-unifi | 3097 | | ed-plan] | 3098 | a=ssrc:1732846380 | [RFC5576] | 3099 | cname:axzo1278npDlAzM73 | | 3100 | a=ssrc:1732846381 | [RFC5576] | 3101 | cname:axzo1278npDlAzM73 | | 3102 | a=ssrc:1732846382 | [RFC5576] | 3103 | cname:axzo1278npDlAzM73 | | 3104 | a=rtcp-fb:* nack | [RFC5104] | 3105 | a=rtcp-fb:* nack pli | [RFC5104] | 3106 | a=rtcp-fb:* ccm fir | [RFC5104] | 3107 | a=rtcp-rsize | [RFC5506] | 3108 +---------------------------------------+---------------------------+ 3110 Table 28: 5.3.2 SDP Offer with SVC 3112 +---------------------------------------+---------------------------+ 3113 | SDP Contents | RFC#/Notes | 3114 +---------------------------------------+---------------------------+ 3115 | v=0 | [RFC4566] | 3116 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3117 | s=- | [RFC4566] | 3118 | t=0 0 | [RFC4566] | 3119 | a=msid-semantic:WMS | [MSID] | 3120 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bu | 3121 | | ndle-negotiation] Alice | 3122 | | supports grouping of | 3123 | | m=lines under BUNDLE | 3124 | | semantics | 3125 | a=ice-options:trickle | [draft-ivov-mmusic-trickl | 3126 | | e-ice] | 3127 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3128 | c=IN IP4 98.248.92.77 | [RFC4566] | 3129 | a=msid:ma ta | Identifies RTCMediaStream | 3130 | | ID (ma) and | 3131 | | RTCMediaStreamTrack ID | 3132 | | (ta) | 3133 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3134 | a=mid:m0 | [RFC5888] Audio m=line | 3135 | | part of BUNDLE group with | 3136 | | a unique port number | 3137 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-o | 3138 | | pus] | 3139 | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | 3140 | :ssrc-audio-level | | 3141 | a=ptime:20 | [draft-ietf-payload-rtp-o | 3142 | | pus] | 3143 | a=rtcp-fb:109 nack | [RFC5104] | 3144 | a=recvonly | [RFC3264] | 3145 | a=setup:active | [RFC4145] - Bob carries | 3146 | | out DTLS Handshake in | 3147 | | parallel | 3148 | a=rtcp-mux | [RFC5761] | 3149 | a=ice-ufrag:074c6550 | [RFC5245] | 3150 | a=ice- | [RFC5245] | 3151 | pwd:a28a397a4c3f31747d1ee3474af08a068 | | 3152 | a=fingerprint:sha-1 99:41:49:83:4a:97 | [RFC5245] | 3153 | :0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:79: | | 3154 | a8:07 | | 3155 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3156 | 192.168.1.7 54609 typ host | | 3157 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3158 | 98.248.92.77 49203 typ srflx raddr | | 3159 | 192.168.1.5 rport 49203 | | 3160 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3161 | 192.168.1.7 60065 typ host | | 3162 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3163 | 98.248.92.77 60065 typ srflx raddr | | 3164 | 192.168.1.5 rport 60065 | | 3165 | a=rtcp-rsize | [RFC5506] | 3166 | m=video 54609 UDP/TLS/RTP/SAVPF 96 | BUNDLE accepted Bundle | 3167 | 100 | address same as audio | 3168 | | m=line. | 3169 | c=IN IP4 98.248.92.77 | [RFC4566] | 3170 | a=msid:ma tb | Identifies RTCMediaStream | 3171 | | ID (ma) and | 3172 | | RTCMediaStreamTrack ID | 3173 | | (tb) | 3174 | a=rtcp:56503 IN IP4 98.248.92.77 | [RFC3605] | 3175 | a=mid:m1 | [RFC5888] Video m=line | 3176 | | part of BUNDLE group | 3177 | a=rtpmap:96 H264/90000 | [RFC3984] | 3178 | a=fmtp:96 profile-level-id=4d0028 | [RFC3984]H.264 Layer 1 | 3179 | ;packetization-mode=1;max-fr=30;max- | | 3180 | fs=8040 | | 3181 | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | 3182 | a=fmtp:100 profile-level-id=4d0028 | [RFC3984] | 3183 | ;packetization-mode=1;max-fr=30;max- | | 3184 | fs=8040 | | 3185 | a=depend:100 lay m1:96; | [RFC5583] Bob chooses 2 | 3186 | | Codec Operation points | 3187 | a=ice-ufrag:074c6550 | [RFC5245] | 3188 | a=ice- | [RFC5245] | 3189 | pwd:a28a397a4c3f31747d1ee3474af08a068 | | 3190 | a=fingerprint:sha-1 99:41:49:83:4a:97 | [RFC5245] | 3191 | :0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:79: | | 3192 | a8:07 | | 3193 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3194 | 192.168.1.5 54609 typ host | | 3195 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3196 | 24.23.204.142 54609 typ srflx raddr | | 3197 | 192.168.1.5 rport 54609 | | 3198 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3199 | 192.168.1.5 64678 typ host | | 3200 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3201 | 24.23.204.142 64678 typ srflx raddr | | 3202 | 192.168.1.5 rport 64678 | | 3203 | a=recvonly | [RFC3264] - Receive only | 3204 | | video stream | 3205 | a=setup:active | [RFC4145] - Bob carries | 3206 | | out DTLS Handshake in | 3207 | | parallel | 3208 | a=rtcp-mux | [RFC5761] | 3209 | a=bundle-only | [draft-roach-mmusic-unifi | 3210 | | ed-plan] | 3211 | a=ssrc:4638117328 | [RFC5576] | 3212 | cname:axzo1278npDlAzM73 | | 3213 | a=rtcp-rsize | [RFC5506] | 3214 +---------------------------------------+---------------------------+ 3216 Table 29: 5.3.2 SDP Answer with SVC 3218 5.3.3. Successful Simulcast Video Streams with Retransmisson 3220 This section shows an SDP Offer/Answer exchange for a simulcast 3221 scenario with 2 two resolutions and has [RFC4588] style re- 3222 transmission flows. 3224 title Simulcast Streams with Retransmission 3226 note right of Alice 3227 Alice offers single audio and simulcasted video stream 3228 end note 3229 Alice->Bob: Offer(Audio:Opus Video:VP8 with 2 resolutions and RTX Stream) bundle-only 3230 note left of Bob 3231 Bob accepts all the streams offered by Alice 3232 end note 3234 Bob->Alice: Answer(Audio:Opus Video:VP8 with 2 resolutions and RTX Stream) bundle-only 3236 Alice<->Bob: 2 Way Audio and Simulcast Video with RTX Streams 3238 +--------------------------------------+----------------------------+ 3239 | SDP Contents | RFC#/Notes | 3240 +--------------------------------------+----------------------------+ 3241 | v=0 | [RFC4566] | 3242 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3243 | s=- | [RFC4566] | 3244 | t=0 0 | [RFC4566] | 3245 | a=msid-semantic:WMS | [MSID] | 3246 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bun | 3247 | | dle-negotiation] Alice | 3248 | | supports grouping of | 3249 | | m=lines under BUNDLE | 3250 | | semantics | 3251 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3252 | | -ice] | 3253 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3254 | c=IN IP4 24.23.204.141 | [RFC4566] | 3255 | a=msid:ma ta | Identifies RTCMediaStream | 3256 | | ID (ma) and | 3257 | | RTCMediaStreamTrack ID | 3258 | | (ta) | 3259 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3260 | a=mid:m0 | [RFC5888] Audio m=line | 3261 | | part of BUNDLE group with | 3262 | | a unique port number | 3263 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 3264 | | us] | 3265 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3266 | hdrext:ssrc-audio-level | | 3267 | a=ptime:20 | [draft-ietf-payload-rtp-op | 3268 | | us] | 3269 | a=rtcp-fb:109 nack | [RFC5104] | 3270 | a=sendrecv | [RFC3264] | 3271 | a=setup:actpass | [RFC4145] - Alice can | 3272 | | perform DTLS before Answer | 3273 | | arrives | 3274 | a=rtcp-mux | [RFC5761] | 3275 | a=ssrc:11111 cname:EocUG1f0fcg/yvY7 | [RFC5576] | 3276 | a=ice-ufrag:074c6550 | [RFC5245] | 3277 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3278 | f08a068 | | 3279 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3280 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3281 | 9:a8:07 | | 3282 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3283 | 192.168.1.4 54609 typ host | | 3284 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3285 | 24.23.204.141 54609 typ srflx raddr | | 3286 | 192.168.1.4 rport 54609 | | 3287 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3288 | 192.168.1.4 64678 typ host | | 3289 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3290 | 24.23.204.141 64678 typ srflx raddr | | 3291 | 192.168.1.4 rport 64678 | | 3292 | a=rtcp-rsize | [RFC5506] | 3293 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line | 3294 | 101 103 | with port number set to | 3295 | | zero | 3296 | c=IN IP4 24.23.204.141 | [RFC4566] | 3297 | a=msid:ma tb | Identifies RTCMediaStream | 3298 | | ID (ma) and | 3299 | | RTCMediaStreamTrack ID | 3300 | | (tb) | 3301 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3302 | a=mid:m1 | [RFC5888] Audio m=line | 3303 | | part of BUNDLE group | 3304 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 3305 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 3306 | a=rtpmap:101 VP8/90000 | [draft-ietf-payload-vp8] | 3307 | a=rtpmap:103 VP8/90000 | [draft-ietf-payload-vp8] | 3308 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3309 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3310 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3311 | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | 3312 | a=simulast: send 98;100 | [draft-westerlund-avtcore- | 3313 | | rtp-simulcast] | 3314 | a=ssrc-group:FID 12345 34567 | [RFC5888] | 3315 | a=ssrc-group:FID 78990 90887 | [RFC5888] | 3316 | a=ssrc:12345 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3317 | a=ssrc:78990 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3318 | a=ssrc:34567 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3319 | a=ssrc:90887 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3320 | a=sendrecv | [RFC3264] | 3321 | a=rtcp-mux | [RFC5761] | 3322 | a=bundle-only | [draft-roach-mmusic-unifie | 3323 | | d-plan] | 3324 | a=rtcp-fb:* nack | [RFC5104] | 3325 | a=rtcp-fb:* nack pli | [RFC5104] | 3326 | a=rtcp-fb:* ccm fir | [RFC5104] | 3327 | a=rtcp-rsize | [RFC5506] | 3328 +--------------------------------------+----------------------------+ 3330 Table 30: 5.3.3 SDP Offer w/Simulcast, RTX 3332 +--------------------------------------+----------------------------+ 3333 | SDP Contents | RFC#/Notes | 3334 +--------------------------------------+----------------------------+ 3335 | v=0 | [RFC4566] | 3336 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3337 | s=- | [RFC4566] | 3338 | t=0 0 | [RFC4566] | 3339 | a=msid-semantic:WMS | [MSID] | 3340 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bun | 3341 | | dle-negotiation] Alice | 3342 | | supports grouping of | 3343 | | m=lines under BUNDLE | 3344 | | semantics | 3345 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3346 | | -ice] | 3347 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3348 | c=IN IP4 98.248.92.77 | [RFC4566] | 3349 | a=msid:ma ta | Identifies RTCMediaStream | 3350 | | ID (ma) and | 3351 | | RTCMediaStreamTrack ID | 3352 | | (ta) | 3353 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3354 | a=mid:m0 | [RFC5888] Audio m=line | 3355 | | part of BUNDLE group with | 3356 | | a unique port number | 3357 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 3358 | | us] | 3359 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3360 | hdrext:ssrc-audio-level | | 3361 | a=ptime:20 | [draft-ietf-payload-rtp-op | 3362 | | us] | 3363 | a=rtcp-fb:109 nack | [RFC5104] | 3364 | a=sendrecv | [RFC3264] | 3365 | a=setup:active | [RFC4145] | 3366 | a=rtcp-mux | [RFC5761] | 3367 | a=ssrc:33333 cname:L/HmN4Xa5NWs1ao1 | [RFC5576] | 3368 | a=ice-ufrag:074c6550 | [RFC5245] | 3369 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3370 | f08a068 | | 3371 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3372 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3373 | 9:a8:07 | | 3374 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3375 | 192.168.1.7 54609 typ host | | 3376 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3377 | 98.248.92.77 54609 typ srflx raddr | | 3378 | 192.168.1.7 rport 49203 | | 3379 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3380 | 192.168.1.7 64678 typ host | | 3381 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3382 | 98.248.92.77 64678 typ srflx raddr | | 3383 | 192.168.1.7 rport 60065 | | 3384 | a=rtcp-rsize | [RFC5506] | 3385 | m=video 49203 UDP/TLS/RTP/SAVPF 98 | BUNDLE accepted with | 3386 | 100 101 103 | Bundle address identical | 3387 | | to audio m-line | 3388 | c=IN IP4 98.248.92.77 | [RFC4566] | 3389 | a=msid:ma tb | Identifies RTCMediaStream | 3390 | | ID (ma) and | 3391 | | RTCMediaStreamTrack ID | 3392 | | (tb) | 3393 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3394 | a=mid:m1 | [RFC5888] Video m=line | 3395 | | part of BUNDLE group | 3396 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 3397 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 3398 | a=rtpmap:101 VP8/90000 | [draft-ietf-payload-vp8] | 3399 | a=rtpmap:103 VP8/90000 | [draft-ietf-payload-vp8] | 3400 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3401 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3402 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3403 | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | 3404 | a=ice-ufrag:074c6550 | [RFC5245] | 3405 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3406 | f08a068 | | 3407 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3408 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3409 | 9:a8:07 | | 3410 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3411 | 192.168.1.7 49203 typ host | | 3412 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3413 | 98.248.92.77 49203 typ srflx raddr | | 3414 | 192.168.1.7 rport 49203 | | 3415 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3416 | 192.168.1.7 60065 typ host | | 3417 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3418 | 98.248.92.772 60065 typ srflx raddr | | 3419 | 192.168.1.7 rport 60065 | | 3420 | a=simulcast: recv 98;100 | [draft-westerlund-avtcore- | 3421 | | rtp-simulcast] | 3422 | a=ssrc-group:FID 54321 88776 | [RFC5888] | 3423 | a=ssrc-group:FID 77656 12908 | [RFC5888] | 3424 | a=ssrc:54321 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576] | 3425 | a=ssrc:77656 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576] | 3426 | a=ssrc:88776 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576] | 3427 | a=ssrc:12908 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576] | 3428 | a=sendrecv | [RFC3264] | 3429 | a=setup:active | [RFC4145] - Bob carries | 3430 | | out DTLS Handshake in | 3431 | | parallel | 3432 | a=rtcp-mux | [RFC5761] | 3433 | a=bundle-only | [draft-roach-mmusic-unifie | 3434 | | d-plan] | 3435 | a=rtcp-fb:* nack | [RFC5104] | 3436 | a=rtcp-fb:* nack pli | [RFC5104] | 3437 | a=rtcp-fb:* ccm fir | [RFC5104] | 3438 | a=rtcp-rsize | [RFC5506] | 3439 +--------------------------------------+----------------------------+ 3441 Table 31: 5.3.3 SDP Answer w/Simulcast, RTX 3443 5.3.4. Successful 1-way Simulcast with 2 resolutions and RTX - One 3444 resolution rejected 3446 This section shows an SDP Offer/Answer exchange for a simulcast 3447 scenario with 2 two resolutions and has [RFC4588] style re- 3448 transmission flows. 3450 It also showcases when Bob rejects one of the Simulcast Video Stream 3451 which results in the rejection of the associated repair stream 3452 implicitly 3454 title Simulcast Streams with Retransmission Rejected 3456 note right of Alice 3457 Alice offers sendonly single audio and simulcasted video stream. 3458 end note 3459 Alice->Bob: Offer(Audio:Opus Video:VP8 with 2 resolutions and RTX Streams) bundle-only 3461 note left of Bob 3462 Bob accepts one simulcast,rtx and rejects the other 3463 end note 3464 Bob->Alice: Answer(Audio:Opus Video:VP8 with 1 resolution and the RTX Stream) bundle-only 3466 Alice->Bob: 1 Way Audio, Video Session 3467 note right of Alice 3468 Only 1 Video stream and its associated RTX stream 3469 is sent to Bob 3470 end note 3472 +--------------------------------------+----------------------------+ 3473 | SDP Contents | RFC#/Notes | 3474 +--------------------------------------+----------------------------+ 3475 | v=0 | [RFC4566] | 3476 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3477 | s=- | [RFC4566] | 3478 | t=0 0 | [RFC4566] | 3479 | a=msid-semantic:WMS | [MSID] | 3480 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bun | 3481 | | dle-negotiation] Alice | 3482 | | supports grouping of | 3483 | | m=lines under BUNDLE | 3484 | | semantics | 3485 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3486 | | -ice] | 3487 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3488 | c=IN IP4 24.23.204.141 | [RFC4566] | 3489 | a=msid:ma ta | Identifies RTCMediaStream | 3490 | | ID (ma) and | 3491 | | RTCMediaStreamTrack ID | 3492 | | (ta) | 3493 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3494 | a=mid:m0 | [RFC5888] Audio m=line | 3495 | | part of BUNDLE group with | 3496 | | a unique port number | 3497 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 3498 | | us] | 3499 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3500 | hdrext:ssrc-audio-level | | 3501 | a=ptime:20 | [draft-ietf-payload-rtp-op | 3502 | | us] | 3503 | a=rtcp-fb:109 nack | [RFC5104] | 3504 | a=sendonly | [RFC3264] | 3505 | a=setup:actpass | [RFC4145] - Alice can | 3506 | | perform DTLS before Answer | 3507 | | arrives | 3508 | a=rtcp-mux | [RFC5761] | 3509 | a=ssrc:11111 cname:LP/NWs1ao1HmN4Xa5 | [RFC5576] | 3510 | a=ice-ufrag:074c6550 | [RFC5245] | 3511 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3512 | f08a068 | | 3513 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3514 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3515 | 9:a8:07 | | 3516 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3517 | 192.168.1.4 54609 typ host | | 3518 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3519 | 24.23.204.141 54609 typ srflx raddr | | 3520 | 192.168.1.4 rport 54609 | | 3521 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3522 | 192.168.1.4 64678 typ host | | 3523 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3524 | 24.23.204.141 64678 typ srflx raddr | | 3525 | 192.168.1.4 rport 64678 | | 3526 | a=rtcp-rsize | [RFC5506] | 3527 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line | 3528 | 101 103 | with port number set to | 3529 | | zero | 3530 | c=IN IP4 24.23.204.141 | [RFC4566] | 3531 | a=msid:ma tb | Identifies RTCMediaStream | 3532 | | ID (ma) and | 3533 | | RTCMediaStreamTrack ID | 3534 | | (tb) | 3535 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3536 | a=mid:m1 | [RFC5888] Audio m=line | 3537 | | part of BUNDLE group | 3538 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 3539 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 3540 | a=rtpmap:101 VP8/90000 | [draft-ietf-payload-vp8] | 3541 | a=rtpmap:103 VP8/90000 | [draft-ietf-payload-vp8] | 3542 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3543 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3544 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3545 | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | 3546 | a=simulcast: send 98;100 | [draft-westerlund-avtcore- | 3547 | | rtp-simulcast] | 3548 | a=ssrc-group:FID 12345 34567 | [RFC5888] | 3549 | a=ssrc-group:FID 78990 90887 | [RFC5888] | 3550 | a=ssrc:12345 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3551 | a=ssrc:78990 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3552 | a=ssrc:34567 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3553 | a=ssrc:90887 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3554 | a=sendonly | [RFC3264] | 3555 | a=rtcp-mux | [RFC5761] | 3556 | a=bundle-only | [draft-roach-mmusic-unifie | 3557 | | d-plan] | 3558 | a=rtcp-fb:* nack | [RFC5104] | 3559 | a=rtcp-fb:* nack pli | [RFC5104] | 3560 | a=rtcp-fb:* ccm fir | [RFC5104] | 3561 | a=rtcp-rsize | [RFC5506] | 3562 +--------------------------------------+----------------------------+ 3564 Table 32: 5.3.4 SDP Offer w/Simulcast, RTX 3566 +--------------------------------------+----------------------------+ 3567 | SDP Contents | RFC#/Notes | 3568 +--------------------------------------+----------------------------+ 3569 | v=0 | [RFC4566] | 3570 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3571 | s=- | [RFC4566] | 3572 | t=0 0 | [RFC4566] | 3573 | a=msid-semantic:WMS | [MSID] | 3574 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bun | 3575 | | dle-negotiation] Alice | 3576 | | supports grouping of | 3577 | | m=lines under BUNDLE | 3578 | | semantics | 3579 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3580 | | -ice] | 3581 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3582 | c=IN IP4 98.248.92.77 | [RFC4566] | 3583 | a=msid:ma ta | Identifies RTCMediaStream | 3584 | | ID (ma) and | 3585 | | RTCMediaStreamTrack ID | 3586 | | (ta) | 3587 | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | 3588 | a=mid:m0 | [RFC5888] Audio m=line | 3589 | | part of BUNDLE group with | 3590 | | a unique port number | 3591 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 3592 | | us] | 3593 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3594 | hdrext:ssrc-audio-level | | 3595 | a=ptime:20 | [draft-ietf-payload-rtp-op | 3596 | | us] | 3597 | a=recvonly | [RFC3264] | 3598 | a=setup:active | [RFC4145] - Bob carries | 3599 | | out DTLS Handshake in | 3600 | | parallel | 3601 | a=rtcp-mux | [RFC5761] | 3602 | a=ice-ufrag:074c6550 | [RFC5245] | 3603 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3604 | f08a068 | | 3605 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3606 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3607 | 9:a8:07 | | 3608 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3609 | 192.168.1.7 49203 typ host | | 3610 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3611 | 98.248.92.77 49203 typ srflx raddr | | 3612 | 192.168.1.7 rport 49203 | | 3613 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3614 | 192.168.1.7 60065 typ host | | 3615 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3616 | 98.248.92.77 60065 typ srflx raddr | | 3617 | 192.168.1.7 rport 60065 | | 3618 | a=rtcp-rsize | [RFC5506] | 3619 | m=video 49203 UDP/TLS/RTP/SAVPF 98 | BUNDLE accepted with | 3620 | 101 | Bundle address identical | 3621 | | to audio m-line | 3622 | c=IN IP4 98.248.92.77 | [RFC4566] | 3623 | a=msid:ma tb | Identifies RTCMediaStream | 3624 | | ID (ma) and | 3625 | | RTCMediaStreamTrack ID | 3626 | | (tb) | 3627 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3628 | a=mid:m1 | [RFC5888] Video m=line | 3629 | | part of BUNDLE group | 3630 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 3631 | a=rtpmap:101 VP8/90000 | [draft-ietf-payload-vp8] | 3632 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3633 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3634 | a=ice-ufrag:074c6550 | [RFC5245] | 3635 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3636 | f08a068 | | 3637 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3638 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3639 | 9:a8:07 | | 3640 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3641 | 192.168.1.7 49203 typ host | | 3642 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3643 | 98.248.92.77 49203 typ srflx raddr | | 3644 | 192.168.1.5 rport 49203 | | 3645 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3646 | 192.168.1.7 60065 typ host | | 3647 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3648 | 98.248.92.77 60065 typ srflx raddr | | 3649 | 192.168.1.5 rport 60065 | | 3650 | a=simulcast: recv 98 | [draft-westerlund-avtcore- | 3651 | | rtp-simulcast] | 3652 | a=ssrc:54321 cname:NWs1ao1HmN4Xa5 | [RFC5576] | 3653 | a=recvonly | [RFC3264] | 3654 | a=setup:active | [RFC4145] - Bob carries | 3655 | | out DTLS Handshake in | 3656 | | parallel | 3657 | a=rtcp-mux | [RFC5761] | 3658 | a=bundle-only | [draft-roach-mmusic-unifie | 3659 | | d-plan] | 3660 | a=rtcp-rsize | [RFC5506] | 3661 +--------------------------------------+----------------------------+ 3663 Table 33: 5.3.4 SDP Answer no Simulcast 3665 5.3.5. Simulcast Video Stream with Forward Error Correction 3667 This section shows an SDP Offer/Answer exchange for Simulcast video 3668 stream at two resolutions and and has [RFC5956] style FEC flows. 3670 On completion of Offer/Answer exchange we end up one audio stream, 2 3671 simulcast video streams and 2 associated FEC streams are sent over a 3672 single 5-tuple. 3674 title Simulcast Streams with Forward Error Correction 3676 note right of Alice 3677 Alice offers sendonly single audio and simulcasted video stream 3678 end note 3679 Alice->Bob: Offer(Audio:Opus Video:VP8 with 2 resolutions with FEC Streams) bundle-only 3681 note left of Bob 3682 Bob accepts simulcast stream as well as FEC streams 3683 end note 3684 Bob->Alice: Answer(Audio:Opus Video:VP8 with 2 resolutions with FEC Streams) bundle-only 3686 Alice->Bob: 1 Way Audio, Video Session 3687 note right of Alice 3688 Successful Session with 4 video streams (Simulcast + FEC) and 1 Audio Stream 3690 +--------------------------------------+----------------------------+ 3691 | SDP Contents | RFC#/Notes | 3692 +--------------------------------------+----------------------------+ 3693 | v=0 | [RFC4566] | 3694 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3695 | s=- | [RFC4566] | 3696 | t=0 0 | [RFC4566] | 3697 | a=msid-semantic:WMS | [MSID] | 3698 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bun | 3699 | | dle-negotiation] Alice | 3700 | | supports grouping of | 3701 | | m=lines under BUNDLE | 3702 | | semantics | 3703 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3704 | | -ice] | 3705 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3706 | c=IN IP4 24.23.204.141 | [RFC4566] | 3707 | a=msid:ma ta | Identifies RTCMediaStream | 3708 | | ID (ma) and | 3709 | | RTCMediaStreamTrack ID | 3710 | | (ta) | 3711 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3712 | a=mid:m0 | [RFC5888] Audio m=line | 3713 | | part of BUNDLE group with | 3714 | | a unique port number | 3715 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 3716 | | us] | 3717 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3718 | hdrext:ssrc-audio-level | | 3719 | a=ptime:20 | [draft-ietf-payload-rtp-op | 3720 | | us] | 3721 | a=rtcp-fb:109 nack | [RFC5104] | 3722 | a=sendrecv | [RFC3264] | 3723 | a=setup:actpass | [RFC4145] - Alice can | 3724 | | perform DTLS before Answer | 3725 | | arrives | 3726 | a=rtcp-mux | [RFC5761] | 3727 | a=ssrc:11111 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3728 | a=ice-ufrag:074c6550 | [RFC5245] | 3729 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3730 | f08a068 | | 3731 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3732 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3733 | 9:a8:07 | | 3734 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3735 | 192.168.1.4 54609 typ host | | 3736 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3737 | 24.23.204.141 54609 typ srflx raddr | | 3738 | 192.168.1.4 rport 54609 | | 3739 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3740 | 192.168.1.4 64678 typ host | | 3741 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3742 | 24.23.204.141 64678 typ srflx raddr | | 3743 | 192.168.1.4 rport 64678 | | 3744 | a=rtcp-rsize | [RFC5506] | 3745 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line | 3746 | 101 103 | with port number set to | 3747 | | zero | 3748 | c=IN IP4 24.23.204.141 | [RFC4566] | 3749 | a=msid:ma tb | Identifies RTCMediaStream | 3750 | | ID (ma) and | 3751 | | RTCMediaStreamTrack ID | 3752 | | (tb) | 3753 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3754 | a=mid:m1 | [RFC5888] Video m=line | 3755 | | part of BUNDLE group | 3756 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 3757 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 3758 | a=rtpmap:101 1d-interleaved- | [RFC5956] | 3759 | parityfec/90000 | | 3760 | a=rtpmap:103 1d-interleaved- | [RFC5956] | 3761 | parityfec/90000 | | 3762 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3763 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3764 | a=fmtp:101 L=5; D=10; repair- | [RFC5956] | 3765 | window=200000 | | 3766 | a=fmtp:103 L=5; D=10; repair- | [RFC5956] | 3767 | window=200000 | | 3768 | a=ssrc-group:SIMULCAST 12345 78990 | Simulcast group | 3769 | a=ssrc-group:FEC-FR 12345 34567 | [RFC5888] | 3770 | a=ssrc-group:FEC-FR 78990 90887 | [RFC5888] | 3771 | a=ssrc:12345 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3772 | a=ssrc:78990 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3773 | a=ssrc:34567 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3774 | a=ssrc:90887 cname:Q/NWs1ao1HmN4Xa5 | [RFC5576] | 3775 | a=sendrecv | [RFC3264] | 3776 | a=rtcp-mux | [RFC5761] | 3777 | a=bundle-only | [draft-roach-mmusic-unifie | 3778 | | d-plan] | 3779 | a=rtcp-fb:* nack | [RFC5104] | 3780 | a=rtcp-fb:* nack pli | [RFC5104] | 3781 | a=rtcp-fb:* ccm fir | [RFC5104] | 3782 | a=rtcp-rsize | [RFC5506] | 3783 +--------------------------------------+----------------------------+ 3785 Table 34: 5.3.5 SDP Offer 3787 +--------------------------------------+----------------------------+ 3788 | SDP Contents | RFC#/Notes | 3789 +--------------------------------------+----------------------------+ 3790 | v=0 | [RFC4566] | 3791 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3792 | s=- | [RFC4566] | 3793 | t=0 0 | [RFC4566] | 3794 | a=msid-semantic:WMS | [MSID] | 3795 | a=group:BUNDLE m0 m1 | [draft-ietf-mmusic-sdp-bun | 3796 | | dle-negotiation] Alice | 3797 | | supports grouping of | 3798 | | m=lines under BUNDLE | 3799 | | semantics | 3800 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3801 | | -ice] | 3802 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3803 | c=IN IP4 98.248.92.77 | [RFC4566] | 3804 | a=msid:ma ta | Identifies RTCMediaStream | 3805 | | ID (ma) and | 3806 | | RTCMediaStreamTrack ID | 3807 | | (ta) | 3808 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3809 | a=mid:m0 | [RFC5888] Audio m=line | 3810 | | part of BUNDLE group with | 3811 | | a unique port number | 3812 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 3813 | | us] | 3814 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3815 | hdrext:ssrc-audio-level | | 3816 | a=ptime:20 | [draft-ietf-payload-rtp-op | 3817 | | us] | 3818 | a=rtcp-fb:109 nack | [RFC5104] | 3819 | a=sendrecv | [RFC3264] | 3820 | a=setup:active | [RFC4145] - Bob carries | 3821 | | out DTLS Handshake in | 3822 | | parallel | 3823 | a=rtcp-mux | [RFC5761] | 3824 | a=ssrc:33333 cname:Y9/cZke09JAtpl98 | [RFC5576] | 3825 | a=ice-ufrag:074c6550 | [RFC5245] | 3826 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3827 | f08a068 | | 3828 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3829 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3830 | 9:a8:07 | | 3831 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3832 | 192.168.1.7 49203 typ host | | 3833 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3834 | 98.248.92.77 49203 typ srflx raddr | | 3835 | 192.168.1.7 rport 49203 | | 3836 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3837 | 192.168.1.7 60065 typ host | | 3838 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3839 | 98.248.92.77 60065 typ srflx raddr | | 3840 | 192.168.1.7 rport 60065 | | 3841 | a=rtcp-rsize | [RFC5506] | 3842 | m=video 49203 UDP/TLS/RTP/SAVPF 98 | BUNDLE accepted with | 3843 | 100 101 103 | Bundle Address identical | 3844 | | to audio m=line. | 3845 | c=IN IP4 98.248.92.77 | [RFC4566] | 3846 | a=msid:ma tb | Identifies RTCMediaStream | 3847 | | ID (ma) and | 3848 | | RTCMediaStreamTrack ID | 3849 | | (tb) | 3850 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3851 | a=mid:m1 | [RFC5888] Video m=line | 3852 | | part of BUNDLE group | 3853 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 3854 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 3855 | a=rtpmap:101 1d-interleaved- | [RFC5956] | 3856 | parityfec/90000 | | 3857 | a=rtpmap:103 1d-interleaved- | [RFC5956] | 3858 | parityfec/90000 | | 3859 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3860 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3861 | a=fmtp:101 L=5; D=10; repair- | [RFC5956] | 3862 | window=200000 | | 3863 | a=fmtp:103 L=5; D=10; repair- | [RFC5956] | 3864 | window=200000 | | 3865 | a=ssrc-group:SIMULCAST 54321 77656 | Simulcast group | 3866 | a=ssrc-group:FEC-FR 54321 88776 | [RFC5888] | 3867 | a=ssrc-group:FEC-FR 77656 12908 | [RFC5888] | 3868 | a=ssrc:54321 cname:Q/1HmN4Xa5CClapa | [RFC5576] | 3869 | a=ssrc:77656 cname:Q/1HmN4Xa5CClapa | [RFC5576] | 3870 | a=ssrc:88776 cname:Q/1HmN4Xa5CClapa | [RFC5576] | 3871 | a=ssrc:12908 cname:Q/1HmN4Xa5CClapa | [RFC5576] | 3872 | a=sendrecv | [RFC3264] | 3873 | a=setup:active | [RFC4145] - Bob carries | 3874 | | out DTLS Handshake in | 3875 | | parallel | 3876 | a=rtcp-mux | [RFC5761] | 3877 | a=bundle-only | [draft-roach-mmusic-unifie | 3878 | | d-plan] | 3879 | a=ice-ufrag:074c6550 | [RFC5245] | 3880 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3881 | f08a068 | | 3882 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3883 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3884 | 9:a8:07 | | 3885 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3886 | 192.168.1.7 49203 typ host | | 3887 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3888 | 98.248.92.77 49203 typ srflx raddr | | 3889 | 192.168.1.7 rport 49203 | | 3890 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3891 | 192.168.1.7 60065 typ host | | 3892 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3893 | 98.248.92.77 60065 typ srflx raddr | | 3894 | 192.168.1.7 rport 60065 | | 3895 | a=rtcp-fb:* nack | [RFC5104] | 3896 | a=rtcp-fb:* nack pli | [RFC5104] | 3897 | a=rtcp-fb:* ccm fir | [RFC5104] | 3898 | a=rtcp-rsize | [RFC5506] | 3899 +--------------------------------------+----------------------------+ 3901 Table 35: 5.3.5 SDP Answer 3903 5.4. Others 3905 The examples in the section provide SDP for a variety of scenarios 3906 related to RTP Header extension, Legacy Interop scenarios and more. 3908 5.4.1. Audio Session - Voice Activity Detection 3910 This example shows Alice indicating the support of the RTP header 3911 extension to include the audio-level of the audio sample carried in 3912 the RTP packet. 3914 title 2-Way Audio with VAD 3916 Alice->Bob: Offer(Audio:Opus,PCMU,PCMA) 3917 note right of Alice 3918 Alice indicates support for including audio-level 3919 end note 3920 Bob->Alice: Answer(Audio:Opus,PCMU,PCMA) 3921 note left of Bob 3922 Bob accepts and indicates his support as well 3923 end note 3924 Alice<->Bob: Two-way Opus Audio 3925 note right of Alice 3926 Per packet audio-level is included in the RTP header. 3927 end note 3929 +--------------------------------------+----------------------------+ 3930 | SDP Contents | RFC#/Notes | 3931 +--------------------------------------+----------------------------+ 3932 | v=0 | [RFC4566] | 3933 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 3934 | s=- | [RFC4566] | 3935 | t=0 0 | [RFC4566] | 3936 | a=msid-semantic:WMS | [MSID] | 3937 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 3938 | | dle-negotiation] | 3939 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3940 | | -ice] | 3941 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3942 | 0 8 | | 3943 | c=IN IP4 24.23.204.141 | [RFC4566] | 3944 | a=mid:audio | [RFC5888] | 3945 | a=msid:ma ta | Identifies RTCMediaStream | 3946 | | ID (ma) and | 3947 | | RTCMediaStreamTrack ID | 3948 | | (ta) | 3949 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 3950 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3951 | hdrext:ssrc-audio-level | | 3952 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 3953 | | us] | 3954 | a=ptime:20 | [draft-ietf-payload-rtp-op | 3955 | | us] | 3956 | a=rtpmap:0 PCMU/8000 | [RFC3551] | 3957 | a=rtpmap:0 PCMA/8000 | [RFC3551] | 3958 | a=sendrecv | [RFC3264] | 3959 | a=setup:actpass | [RFC4145] | 3960 | a=rtcp-mux | [RFC5761] | 3961 | a=ice-ufrag:074c6550 | [RFC5245] | 3962 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 3963 | f08a068 | | 3964 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 3965 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 3966 | 9:a8:07 | | 3967 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3968 | 192.168.1.4 54609 typ host | | 3969 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3970 | 24.23.204.141 54609 typ srflx raddr | | 3971 | 192.168.1.4 rport 54609 | | 3972 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3973 | 192.168.1.4 64678 typ host | | 3974 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3975 | 24.23.204.141 64678 typ srflx raddr | | 3976 | 192.168.1.4 rport 64678 | | 3977 | a=rtcp-fb:* nack | [RFC5104] | 3978 | a=ssrc:11111 | [RFC5576] | 3979 | cname:QCL/1HmN4Xa5CClapa | | 3980 | a=rtcp-rsize | [RFC5506] | 3981 +--------------------------------------+----------------------------+ 3983 Table 36: 5.4.1 SDP Offer 3985 +--------------------------------------+----------------------------+ 3986 | SDP Contents | RFC#/Notes | 3987 +--------------------------------------+----------------------------+ 3988 | v=0 | [RFC4566] | 3989 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 3990 | | Information | 3991 | s=- | [RFC4566] | 3992 | t=0 0 | [RFC4566] | 3993 | a=msid-semantic:WMS | [MSID] | 3994 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 3995 | | dle-negotiation] | 3996 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 3997 | | -ice] | 3998 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 3999 | 0 98 | | 4000 | c=IN IP4 98.248.92.77 | [RFC4566] | 4001 | a=mid:audio | [RFC5888] | 4002 | a=msid:ma ta | Identifies RTCMediaStream | 4003 | | ID (ma) and | 4004 | | RTCMediaStreamTrack ID | 4005 | | (ta) | 4006 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 4007 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 4008 | hdrext:ssrc-audio-level | | 4009 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 4010 | | us] - Bob accepts only | 4011 | | Opus Codec | 4012 | a=ptime:20 | [draft-ietf-payload-rtp-op | 4013 | | us] | 4014 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 4015 | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | 4016 | a=rtcp-fb:* nack | [RFC5104] | 4017 | a=sendrecv | [RFC3264] - Bob can send | 4018 | | and recv audio | 4019 | a=setup:active | [RFC4145] - Bob carries | 4020 | | out DTLS Handshake in | 4021 | | parallel | 4022 | a=rtcp-mux | [RFC5761] - Bob can | 4023 | | perform RTP/RTCP Muxing on | 4024 | | port 49203 | 4025 | a=ice-ufrag:c300d85b | [RFC5245] | 4026 | a=ice- | [RFC5245] | 4027 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 4028 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 4029 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 4030 | 9:a8:07 | | 4031 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4032 | 192.168.1.7 49203 typ host | | 4033 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 4034 | 98.248.92.77 49203 typ srflx raddr | | 4035 | 192.168.1.7 rport 49203 | | 4036 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 4037 | 192.168.1.7 60065 typ host | | 4038 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4039 | 98.248.92.77 60065 typ srflx raddr | | 4040 | 192.168.1.7 rport 60065 | | 4041 | a=ssrc:1732846380 | [RFC5576] | 4042 | cname:EocUG1f0fcg/yvY7 | | 4043 | a=rtcp-rsize | [RFC5506] | 4044 +--------------------------------------+----------------------------+ 4046 Table 37: 5.4.1 SDP Answer 4048 5.4.2. Audio Conference - Voice Activity Detection 4050 This example shows SDP for RTP header extension that allows RTP-level 4051 mixers in audio conferences to deliver information about the audio 4052 level of individual participants. 4054 title Audio Conference with VAD Support 4056 Alice->Mixer: Offer(Audio:Opus,PCMU,PCMA) 4057 note right of Alice 4058 Alice indicates its interest to audio levels for the contributing sources 4059 end note 4060 Mixer->Alice: Answer(Audio:Opus,PCMU,PCMA) 4061 note left of Bob 4062 Mixer indicates it can provide audio-levels per CSRC 4063 end note 4064 Alice<->Mixer: Two-way Opus Audio 4065 note right of Alice 4066 Audio levels per CSRC is included in the RTP Header 4067 end note 4069 +--------------------------------------+----------------------------+ 4070 | SDP Contents | RFC#/Notes | 4071 +--------------------------------------+----------------------------+ 4072 | v=0 | [RFC4566] | 4073 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 4074 | | Information | 4075 | s=- | [RFC4566] | 4076 | t=0 0 | [RFC4566] | 4077 | a=msid-semantic:WMS | [MSID] | 4078 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 4079 | | dle-negotiation] | 4080 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 4081 | | -ice] | 4082 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4083 | 0 8 | | 4084 | c=IN IP4 24.23.204.141 | [RFC4566] | 4085 | a=mid:audio | [RFC5888] | 4086 | a=msid:ma ta | Identifies RTCMediaStream | 4087 | | ID (ma) and | 4088 | | RTCMediaStreamTrack ID | 4089 | | (ta) | 4090 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 4091 | a=extmap:1/recvonly urn:ietf:params | [RFC6465] | 4092 | :rtp-hdrext:csrc-audio-level | | 4093 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 4094 | hdrext:ssrc-audio-level | | 4095 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 4096 | | us] - Opus Codec 48khz, 2 | 4097 | | channels | 4098 | a=ptime:20 | [draft-ietf-payload-rtp-op | 4099 | | us] - Opus packetization | 4100 | | of 20ms | 4101 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 4102 | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | 4103 | a=rtcp-fb:* nack | [RFC5104] | 4104 | a=sendrecv | [RFC3264] - Alice can send | 4105 | | and recv audio | 4106 | a=setup:actpass | [RFC4145] - Alice can | 4107 | | perform DTLS before Answer | 4108 | | arrives | 4109 | a=rtcp-mux | [RFC5761] - Alice can | 4110 | | perform RTP/RTCP Muxing on | 4111 | | port 54609 | 4112 | a=ice-ufrag:074c6550 | [RFC5245] | 4113 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 4114 | f08a068 | | 4115 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 4116 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 4117 | 9:a8:07 | | 4118 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4119 | 192.168.1.4 54609 typ host | | 4120 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 4121 | 24.23.204.141 54609 typ srflx raddr | | 4122 | 192.168.1.4 rport 54609 | | 4123 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 4124 | 192.168.1.4 64678 typ host | | 4125 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4126 | 24.23.204.141 64678 typ srflx raddr | | 4127 | 192.168.1.4 rport 64678 | | 4128 | a=ssrc:11111 | [RFC5576] | 4129 | cname:QCL/1HmN4Xa5CClapa | | 4130 | a=rtcp-rsize | [RFC5506] | 4131 +--------------------------------------+----------------------------+ 4133 Table 38: 5.4.2 SDP Offer 4135 +--------------------------------------+----------------------------+ 4136 | SDP Contents | RFC#/Notes | 4137 +--------------------------------------+----------------------------+ 4138 | v=0 | [RFC4566] | 4139 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 4140 | | Information | 4141 | s=- | [RFC4566] | 4142 | t=0 0 | [RFC4566] | 4143 | a=msid-semantic:WMS | [MSID] | 4144 | a=group:BUNDLE audio | [draft-ietf-mmusic-sdp-bun | 4145 | | dle-negotiation] | 4146 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 4147 | | -ice] | 4148 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4149 | 0 98 | | 4150 | c=IN IP4 98.248.92.77 | [RFC4566] | 4151 | a=mid:audio | [RFC5888] | 4152 | a=msid:ma ta | Identifies RTCMediaStream | 4153 | | ID (ma) and | 4154 | | RTCMediaStreamTrack ID | 4155 | | (ta) | 4156 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 4157 | a=extmap:1/sendonly urn:ietf:params | [RFC6465] | 4158 | :rtp-hdrext:csrc-audio-level | | 4159 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 4160 | | us] - Bob accepts only | 4161 | | Opus Codec | 4162 | a=ptime:20 | [draft-ietf-payload-rtp-op | 4163 | | us] | 4164 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 4165 | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | 4166 | a=rtcp-fb:* nack | [RFC5104] | 4167 | a=sendrecv | [RFC3264] - Bob can send | 4168 | | and recv audio | 4169 | a=setup:active | [RFC4145] - Bob carries | 4170 | | out DTLS Handshake in | 4171 | | parallel | 4172 | a=rtcp-mux | [RFC5761] - Bob can | 4173 | | perform RTP/RTCP Muxing on | 4174 | | port 49203 | 4175 | a=ice-ufrag:c300d85b | [RFC5245] | 4176 | a=ice- | [RFC5245] | 4177 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 4178 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 4179 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 4180 | 9:a8:07 | | 4181 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4182 | 192.168.1.7 49203 typ host | | 4183 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 4184 | 98.248.92.77 49203 typ srflx raddr | | 4185 | 192.168.1.7 rport 49203 | | 4186 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 4187 | 192.168.1.7 60065 typ host | | 4188 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4189 | 98.248.92.77 60065 typ srflx raddr | | 4190 | 192.168.1.7 rport 60065 | | 4191 | a=ssrc:2222 cname:HmN4Xa5CC/lapa | [RFC5576] | 4192 | a=rtcp-rsize | [RFC5506] | 4193 +--------------------------------------+----------------------------+ 4195 Table 39: 5.4.2 SDP Answer 4197 5.4.3. Successful legacy Interop Fallaback with bundle-only 4199 In the scenario described below, Alice is a multi-stream capable 4200 WebRTC endpoint while Bob is a legacy VOIP end-point. The SDP Offer/ 4201 Answer exchange demonstrates successful session setup with fallback 4202 to audio only stream negotiated via bundle-only framework between the 4203 end-points. Specifically, 4205 o Offer from Alice describes 2 cameras via 2 video m=lines with both 4206 marked as bundle-only. 4208 o Since Bob doesnot recognize either BUNDLE mechanism or bundle-only 4209 attribute, he accepts only the audio stream from Alice. 4211 title Successful 2-Way WebRTC <-> VOIP Interop 4213 note right of Alice 4214 Alice is a multistream capable WebRTC end-point & Bob is behind a legacy VOIP system 4215 end note 4216 Alice->Bob: Offer(Audio:Opus Video: 2 VP8, 2 H2.64 Streams) with bundle-only offer 4217 note right of Alice 4218 Alice marks both the video streams as bundle-only 4219 end note 4220 Bob->Alice: Answer(Audio:Opus) 4221 note left of Bob 4222 Bob accepts only Audio stream since he doesn't recognize 4223 bundle-only streams 4224 end note 4225 Alice<->Bob: Two-way Opus Audio 4227 +--------------------------------------+----------------------------+ 4228 | SDP Contents | RFC#/Notes | 4229 +--------------------------------------+----------------------------+ 4230 | v=0 | [RFC4566] | 4231 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 4232 | s=- | [RFC4566] | 4233 | t=0 0 | [RFC4566] | 4234 | a=msid-semantic:WMS | [MSID] | 4235 | a=group:BUNDLE m0 m1 m2 | [draft-ietf-mmusic-sdp-bun | 4236 | | dle-negotiation] Alice | 4237 | | supports grouping of | 4238 | | m=lines under BUNDLE | 4239 | | semantics | 4240 | a=ice-options:trickle | [draft-ivov-mmusic-trickle | 4241 | | -ice] | 4242 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4243 | c=IN IP4 24.23.204.141 | [RFC4566] | 4244 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 4245 | a=mid:m0 | [RFC5888] Audio m=line | 4246 | | part of BUNDLE group with | 4247 | | a unique port number | 4248 | a=msid:ma ta | Identifies RTCMediaStream | 4249 | | ID (ma) and | 4250 | | RTCMediaStreamTrack ID | 4251 | | (ta) | 4252 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-rtp-op | 4253 | | us] | 4254 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 4255 | hdrext:ssrc-audio-level | | 4256 | a=ptime:20 | [draft-ietf-payload-rtp-op | 4257 | | us] | 4258 | a=rtcp-fb:109 nack | [RFC5104] | 4259 | a=sendrecv | [RFC3264] | 4260 | a=setup:actpass | [RFC4145] - Alice can | 4261 | | perform DTLS before Answer | 4262 | | arrives | 4263 | a=rtcp-mux | [RFC5761] | 4264 | a=ice-ufrag:074c6550 | [RFC5245] | 4265 | a=ice-pwd:a28a397a4c3f31747d1ee3474a | [RFC5245] | 4266 | f08a068 | | 4267 | a=fingerprint:sha-1 99:41:49:83:4a:9 | [RFC5245] | 4268 | 7:0e:1f:ef:6d:f7:c9:c7:70:9d:1f:66:7 | | 4269 | 9:a8:07 | | 4270 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4271 | 192.168.1.4 54609 typ host | | 4272 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 4273 | 24.23.204.141 54609 typ srflx raddr | | 4274 | 192.168.1.4 rport 54609 | | 4275 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 4276 | 192.168.1.4 64678 typ host | | 4277 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4278 | 24.23.204.141 64678 typ srflx raddr | | 4279 | 192.168.1.4 rport 64678 | | 4280 | a=ssrc:11111 cname:axzo1278npDlAzM73 | [RFC5576]E | 4281 | a=rtcp-rsize | [RFC5506] | 4282 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line | 4283 | | with port number set to | 4284 | | zero | 4285 | c=IN IP4 24.23.204.141 | [RFC4566] | 4286 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 4287 | a=mid:m1 | [RFC5888] Video m=line | 4288 | | part of BUNDLE group | 4289 | a=msid:ma tb | Identifies RTCMediaStream | 4290 | | ID (ma) and | 4291 | | RTCMediaStreamTrack ID | 4292 | | (tb) | 4293 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-vp8] | 4294 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-vp8] | 4295 | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Encoding | 4296 | | -1 Resolution | 4297 | a=fmtp:98 max-fr=30 | [RFC4566] | 4298 | a=imageattr:100 [x=640,y=480] | [RFC6236] | 4299 | | Camera-1,Encoding-2 | 4300 | | Resolution | 4301 | a=fmtp:100 max-fr=15 | [RFC4566] | 4302 | a=ssrc-group:SIMULCAST 12345 45678 | [RFC5576] | 4303 | a=ssrc:12345 cname:axzo1278npDlAzM73 | [RFC5576]E | 4304 | a=ssrc:45678 cname:axzo1278npDlAzM73 | [RFC5576] | 4305 | a=bundle-only | [draft-roach-mmusic-unifie | 4306 | | d-plan] | 4307 | a=rtcp-rsize | [RFC5506] | 4308 | m=video 0 UDP/TLS/RTP/SAVPF 101 103 | bundle-only video line | 4309 | | with port number set to | 4310 | | zero | 4311 | c=IN IP4 24.23.204.141 | [RFC4566] | 4312 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 4313 | a=mid:m2 | [RFC5888] Video m=line | 4314 | | part of BUNDLE group | 4315 | a=msid:ma tc | Identifies RTCMediaStream | 4316 | | ID (ma) and | 4317 | | RTCMediaStreamTrack ID | 4318 | | (tc) | 4319 | a=rtpmap:101 H264/90000 | [RFC3984] | 4320 | a=rtpmap:103 H264/90000 | [RFC3984] | 4321 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding | 4322 | ;packetization-mode=1;max-fr=30 | -1 Resolution | 4323 | a=fmtp:100 profile-level-id=4d0028 | [RFC3984]Camera-1,Encoding | 4324 | ;packetization-mode=1;max-fr=15 | -2 Resolution | 4325 | a=ssrc-group:SIMULCAST 67890 56789 | [RFC5576] | 4326 | a=ssrc:67890 cname:axzo1278npDlAzM73 | [RFC5576] | 4327 | a=ssrc:56789 cname:axzo1278npDlAzM73 | [RFC5576] | 4328 | a=bundle-only | [draft-roach-mmusic-unifie | 4329 | | d-plan] | 4330 | a=rtcp-rsize | [RFC5506] | 4331 +--------------------------------------+----------------------------+ 4333 Table 40: 5.4.3 SDP Simulcast bundle-only 4335 +-------------------------------------------+-----------------------+ 4336 | SDP Contents | RFC#/Notes | 4337 +-------------------------------------------+-----------------------+ 4338 | v=0 | [RFC4566] | 4339 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 4340 | s=- | [RFC4566] | 4341 | t=0 0 | [RFC4566] | 4342 | a=msid-semantic:WMS | [MSID] | 4343 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4344 | c=IN IP4 24.23.204.141 | [RFC4566] | 4345 | a=rtcp:60065 IN IP4 24.23.204.141 | [RFC3605] | 4346 | a=rtpmap:109 opus/48000/2 | [draft-ietf-payload-r | 4347 | | tp-opus] | 4348 | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | 4349 | :ssrc-audio-level | | 4350 | a=ptime:20 | [draft-ietf-payload-r | 4351 | | tp-opus] | 4352 | a=rtcp-fb:109 nack | [RFC5104] | 4353 | a=sendrecv | [RFC3264] | 4354 | a=setup:active | [RFC4145] - Bob | 4355 | | carries out DTLS | 4356 | | Handshake in parallel | 4357 | a=ice-ufrag:ufrag:c300d85b | [RFC5245] | 4358 | a=ice- | [RFC5245] | 4359 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 4360 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e: | [RFC5245] | 4361 | 1f:ef:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 4362 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4363 | 192.168.1.7 49203 typ host | | 4364 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 4365 | 98.248.92.77 49203 typ srflx raddr | | 4366 | 192.168.1.7 rport 49203 | | 4367 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 4368 | 192.168.1.7 60065 typ host | | 4369 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4370 | 98.248.92.77 60065 typ srflx raddr | | 4371 | 192.168.1.7 rport 60065 | | 4372 | a=rtcp-rsize | [RFC5506] | 4373 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | 4374 | | bundle-only and hence | 4375 | | rejects the video | 4376 | | stream | 4377 | c=IN IP4 98.248.92.77 | [RFC4566] | 4378 | a=rtpmap:98 VP8/90000 | [draft-ietf-payload-v | 4379 | | p8] | 4380 | a=rtpmap:100 VP8/90000 | [draft-ietf-payload-v | 4381 | | p8] | 4382 | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Enc | 4383 | | oding-1 Resolution | 4384 | a=fmtp:98 max-fr=30 | [RFC4566] | 4385 | a=imageattr:100 [x=640,y=480] | [RFC6236] | 4386 | | Camera-1,Encoding-2 | 4387 | | Resolution | 4388 | a=fmtp:100 max-fr=15 | [RFC4566] | 4389 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | 4390 | | bundle-only and hence | 4391 | | rejects the video | 4392 | | stream | 4393 | c=IN IP4 98.248.92.77 | [RFC4566] | 4394 | a=rtpmap:101 H264/90000 | [RFC3984] | 4395 | a=rtpmap:103 H264/90000 | [RFC3984] | 4396 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Enc | 4397 | ;packetization-mode=1;max-fr=30 | oding-1 Resolution | 4398 | a=fmtp:100 profile-level-id=4d0028 | [RFC3984]Camera-1,Enc | 4399 | ;packetization-mode=1;max-fr=15 | oding-2 Resolution | 4400 +-------------------------------------------+-----------------------+ 4402 Table 41: 5.4.3 SDP Anwer 4404 5.4.4. Legacy Interop with RTP/AVP profile 4406 In this section, we attempt to provide session descriptions 4407 showcasing inter-operability between a WebRTC end-point and a Legacy 4408 VOIP end-point. The ideas included in here are not fully baked into 4409 the standards and might be controversial in nature. The hope here is 4410 to demonstrate a plausible SDP composition to enchance seamless 4411 inter-operability between the aforementioned communication systems. 4413 In the scenario desribed below, Alice sends [RFC3264] Offer with two 4414 sets of media descriptions per media type. 4416 One set that correponds to [WebRTC] compliant UDP/TLS/RTP/SAVPF 4417 based audio and video descriptions. 4419 Another set with RTP/AVP based audio and video descriptions for 4420 the legacy Interop purposes. 4422 Also to note, Alice includes session level DTLS information and 4423 media level RTCP feedback information as applicable to both the 4424 sets of media descriptions 4426 On the other hand, Bob being a Legacy VOIP end-point, recognizes only 4427 the media descriptions with RTP/AVP as the application protocol. The 4428 security and fedback requirements for the session are either handled 4429 by a intermediate gateway or with some combination of Bob's 4430 capabilities and the intermediate gateway. 4432 title Successful 2-Way WebRTC <-> VOIP Interop 4433 note right of Alice 4434 Alice is on a WebRTC end-point & Bob is behind a legacy VOIP system 4435 end note 4436 Alice->Bob: Offer(Audio:Opus Video:VP8) 4437 note right of Alice 4438 Alice includes 2 copies of media descriptions 4439 1. WebRTC compliant media description (UDP/TLS/RTP/SAVPF) 4440 2. Legacy compliant media description (RTP/AVP) 4441 end note 4442 Bob->Alice: Answer(Audio:Opus Video:VP8) 4443 note right of Bob 4444 Bob recognizes"legacy compliant" media description from Alice. 4445 and accepts the same. 4446 end note 4447 Alice->Bob: Two-way Opus Audio, VP8 Video 4448 note right of Alice 4449 Session also suports RTP/RTCP Mux, RTCP feedback (nack,pli) 4450 end note 4451 +---------------------------------------------+---------------------+ 4452 | SDP Contents | RFC#/Notes | 4453 +---------------------------------------------+---------------------+ 4454 | v=0 | [RFC4566] | 4455 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 4456 | s=- | [RFC4566] | 4457 | t=0 0 | [RFC4566] | 4458 | a=ice-ufrag:074c6550 | [RFC5245] | 4459 | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a068 | [RFC5245] | 4460 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f | [RFC5245] | 4461 | :ef:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 4462 | a=rtcp-rsize | [RFC5506] | 4463 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4464 | c=IN IP4 24.23.204.141 | [RFC4566] | 4465 | a=rtpmap:109 opus/48000 | | 4466 | a=ptime:20 | | 4467 | a=sendrecv | [RFC3264] | 4468 | a=rtcp-mux | [RFC5761] | 4469 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4470 | 54609 typ host | | 4471 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 4472 | 24.23.204.141 54609 typ srflx raddr | | 4473 | 192.168.1.4 rport 54609 | | 4474 | a=candidate:0 2 UDP 2113667326 192.168.1.4 | [RFC5245] | 4475 | 64678 typ host | | 4476 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4477 | 24.23.204.141 64678 typ srflx raddr | | 4478 | 192.168.1.4 rport 64678 | | 4479 | a=rtcp-fb:109 nack | [RFC5104] | 4480 | m=video 62537 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 4481 | c=IN IP4 24.23.204.141 | [RFC4566] | 4482 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload | 4483 | | -vp8] | 4484 | a=sendrecv | [RFC3264] | 4485 | a=rtcp-mux | [RFC5761] | 4486 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4487 | 62537 typ host | | 4488 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 4489 | 24.23.204.141 62537 typ srflx raddr | | 4490 | 192.168.1.4 rport 62537 | | 4491 | a=candidate:0 2 2113667326 192.168.1.4 | [RFC5245] | 4492 | 54721 typ host | | 4493 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4494 | 24.23.204.141 54721 typ srflx raddr | | 4495 | 192.168.1.4 rport 54721 | | 4496 | a=rtcp-fb:120 nack pli | [RFC5104] | 4497 | a=rtcp-fb:120 ccm fir | [RFC5104] | 4498 | --------------- | These set of media | 4499 | | descriptions are | 4500 | | for Legacy Inter-op | 4501 | | purposes | 4502 | m=audio 54732 RTP/AVP 109 | [RFC4566]Alice | 4503 | | includes RTP/AVP | 4504 | | audio stream | 4505 | | description | 4506 | c=IN IP4 24.23.204.141 | [RFC4566] | 4507 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f | [RFC5245] | 4508 | :7f:7d:f9:c9:c7:70:9d:1f:66:79:a8:07 | | 4509 | a=rtpmap:109 opus/48000 | | 4510 | a=ptime:20 | | 4511 | a=sendrecv | [RFC3264] | 4512 | a=rtcp-mux | [RFC5761]Alice | 4513 | | still includes | 4514 | | RTP/RTCP Mux | 4515 | | support | 4516 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4517 | 54732 typ host | | 4518 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 4519 | 24.23.204.141 54732 typ srflx raddr | | 4520 | 192.168.1.4 rport 54732 | | 4521 | a=candidate:0 2 UDP 2113667326 192.168.1.4 | [RFC5245] | 4522 | 64678 typ host | | 4523 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4524 | 24.23.204.141 64678 typ srflx raddr | | 4525 | 192.168.1.4 rport 64678 | | 4526 | a=rtcp-fb:109 nack | [RFC5104]She adds | 4527 | | her intent for NACK | 4528 | | RTCP feedback | 4529 | | support | 4530 | m=video 62445 RTP/AVP 120 | [RFC4566]Alice | 4531 | | includes RTP/AVP | 4532 | | video stream | 4533 | | description | 4534 | c=IN IP4 24.23.204.141 | [RFC4566] | 4535 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f | [RFC5245] | 4536 | :ef:7d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 4537 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload | 4538 | | -vp8] | 4539 | a=sendrecv | [RFC3264] | 4540 | a=rtcp-mux | [RFC5761]Alice | 4541 | | intends to perform | 4542 | | RTP/RTCP Mux | 4543 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4544 | 62445 typ host | | 4545 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 4546 | 24.23.204.141 62537 typ srflx raddr | | 4547 | 192.168.1.4 rport 62445 | | 4548 | a=candidate:0 2 2113667326 192.168.1.4 | [RFC5245] | 4549 | 54721 typ host | | 4550 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4551 | 24.23.204.141 54721 typ srflx raddr | | 4552 | 192.168.1.4 rport 54721 | | 4553 | a=rtcp-fb:120 nack pli | [RFC5104] Alice | 4554 | | indicates support | 4555 | | for Picture loss | 4556 | | Indication and NACK | 4557 | | RTCP feedback | 4558 | a=rtcp-fb:120 ccm fir | [RFC5104] | 4559 +---------------------------------------------+---------------------+ 4561 Table 42: 5.4.5 SDP Offer 4563 +---------------------------------------------+---------------------+ 4564 | SDP Contents | RFC#/Notes | 4565 +---------------------------------------------+---------------------+ 4566 | v=0 | [RFC4566] | 4567 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 4568 | s=- | [RFC4566] | 4569 | t=0 0 | [RFC4566] | 4570 | a=ice-ufrag:c300d85b | [RFC5245] | 4571 | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 | [RFC5245] | 4572 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f | [RFC5245] | 4573 | :ef:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 4574 | m=audio 49203 RTP/AVP 109 | [RFC4566] Bob | 4575 | | accepts RTP/AVP | 4576 | | based audio stream | 4577 | c=IN IP4 98.248.92.77 | [RFC4566] | 4578 | a=rtpmap:109 opus/48000 | | 4579 | a=ptime:20 | | 4580 | a=sendrecv | [RFC3264] | 4581 | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245] | 4582 | 49203 typ host | | 4583 | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245] | 4584 | 49203 typ srflx raddr 192.168.1.7 rport | | 4585 | 49203 | | 4586 | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245] | 4587 | 60065 typ host | | 4588 | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245] | 4589 | 60065 typ srflx raddr 192.168.1.7 rport | | 4590 | 60065 | | 4591 | m=video 63130 RTP/SAVP 120 | [RFC4566] Bob | 4592 | | accepts RTP/AVP | 4593 | | based video stram | 4594 | c=IN IP4 98.248.92.771 | [RFC4566] | 4595 | a=rtpmap:120 VP8/90000 | [draft-ietf-payload | 4596 | | -vp8] | 4597 | a=sendrecv | [RFC3264] | 4598 | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245] | 4599 | 63130 typ host | | 4600 | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245] | 4601 | 63130 typ srflx raddr 192.168.1.7 rport | | 4602 | 63130 | | 4603 | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245] | 4604 | 56607 typ host | | 4605 | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245] | 4606 | 56607 typ srflx raddr 192.168.1.7 rport | | 4607 | 56607 | | 4608 +---------------------------------------------+---------------------+ 4610 Table 43: 5.4.5 SDP Answer 4612 6. IANA Considerations 4614 This document requires no actions from IANA. 4616 7. Acknowledgments 4618 We would like to thanks Justin Uberti, Chris Flo for his detailed 4619 review and inputs. 4621 8. Change Log 4623 [RFC EDITOR NOTE: Please remove this section when publishing] 4625 Changes from draft-nandakumar-rtcweb-sdp-04 4627 o Interim version of the draft to avert expiry 4629 o Corrected placement of c= line as per RFC4566 4631 o Updated simulcast SDP to reflect draft-westerlund-avtcore-rtp- 4632 simulcast-04 4634 Changes from draft-nandakumar-rtcweb-sdp-03 4636 o Aligned more closely with JSEP version -05 4638 o Added Conventions to help readability 4640 o Add more examples to clarify BUNDLE use-cases 4642 Changes from draft-nandakumar-rtcweb-sdp-02 4644 o Major refactoring was done to group the examples in to categories 4646 o SDP was updated through out to reflect JSEP-04 style of defining 4647 attributes per m=line than at the session level. 4649 o Added 8 new examples. 4651 o Updated references for Trickle, Unified Plan 4653 o Add section to explain the syntax conventions followed in the 4654 examples. 4656 Changes from draft-nandakumar-rtcweb-sdp-01 4658 o Updated references to OPUS RTP Payload Specification. 4660 o Updated BUNDLE examples based on the latest draft-ietf-mmusic-sdp- 4661 bundle-negotiation. 4663 o Added examples for multiple audio and video flows based on Unified 4664 Plan. 4666 o Added new examples for RTX and FEC streams 4668 o Updated Simulcast and SVC examples 4670 Changes from draft-nandakumar-rtcweb-sdp-00 4672 o Fixed editorial comments on the mailing list. 4674 o Updated Data-channel SDP information based on draft-ietf-mmusic- 4675 sctp-sdp. 4677 o Updated BUNDLE examples based on draft-ietf-mmusic-sdp-bundle- 4678 negotiation. 4680 o Added examples for few more BUNDLE variants 4682 o Added new examples for Simulcast and SVC 4684 9. References 4686 9.1. Normative References 4688 [RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model 4689 with Session Description Protocol (SDP)", RFC 3264, June 4690 2002. 4692 [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session 4693 Description Protocol", RFC 4566, July 2006. 4695 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 4696 Requirement Levels", BCP 14, RFC 2119, March 1997. 4698 9.2. Informative References 4700 [RFC5245] Rosenberg, J., "Interactive Connectivity Establishment 4701 (ICE): A Protocol for Network Address Translator (NAT) 4702 Traversal for Offer/Answer Protocols", RFC 5245, July 4703 2006. 4705 [WebRTC] W3C, "WebRTC 1.0: Real-time Communication Between 4706 Browsers", 4707 , . 4709 [JSEP] Uberti, J. and C. Jennigs, "Javascript Session 4710 Establishment Protocol", draft-ietf-rtcweb-jsep (work in 4711 progress), December 2012. 4713 [MSID] Alvestrand, H., "Cross Session Stream Identification in 4714 the Session Description Protocol", draft-ietf-mmusic-msid 4715 (work in progress), January 2014. 4717 [RFC5506] Johansson, I., "Support for Reduced-Size Real-Time 4718 Transport Control Protocol (RTCP): Opportunities and 4719 Consequences", RFC 5506, April 2009. 4721 [RFC3551] Schulzrinne, H. and S. Casner, "RTP Profile for Audio and 4722 Video Conferences with Minimal Control", RFC 3551, July 4723 2003. 4725 [RFC3952] Duric, A. and S. Andersen, "Real-time Transport Protocol 4726 (RTP) Payload Format for internet Low Bit Rate Codec 4727 (iLBC) Speech", RFC 3952, December 2004. 4729 [RFC4796] Hautakorpi, J. and G. Camarillo, "The Session Description 4730 Protocol (SDP) Content Attribute", RFC 4796, February 4731 2007. 4733 [RFC5761] Perkins, C. and M. Westerlund, "Multiplexing RTP Data and 4734 Control Packets on a Single Port", RFC 5761, April 2010. 4736 [RFC3556] Casner, S., "Session Description Protocol (SDP) Bandwidth 4737 Modifiers for RTP Control Protocol (RTCP) Bandwidth", RFC 4738 3556, July 2003. 4740 [RFC5104] Wenger, S., Chandra, U., Westerlund, M., and B. Burman, 4741 "Codec Control Messages in the RTP Audio-Visual Profile 4742 with Feedback (AVPF)", RFC 5104, February 2008. 4744 [RFC4588] Rey, J., Leon, D., Miyazaki, A., Varsa, V., and R. 4745 Hakenberg, "RTP Retransmission Payload Format", RFC 4588, 4746 July 2006. 4748 [RFC5956] Begen, A., "Forward Error Correction Grouping Semantics in 4749 the Session Description Protocol", RFC 5956, September 4750 2010. 4752 [RFC5888] Camarillo, G. and H. Schulzrinne, "RTP Payload Format for 4753 H.264 Video", RFC 5888, June 2010. 4755 [RFC6236] Johansson, I. and K. Jung, "Negotiation of Generic Image 4756 Attributes in the Session Description Protocol (SDP)", RFC 4757 6236, May 2011. 4759 [draft-ietf-payload-rtp-opus] 4760 Spittka, J., Vos, K., and JM. Valin, "RTP Payload Format 4761 for Opus Speech and Audio Codec", draft-ietf-payload-rtp- 4762 opus-00 (work in progress), July 2012. 4764 [draft-ietf-payload-vp8] 4765 Westin, P., Lundin, H., Glover, M., Uberti, J., and F. 4766 Galligan, "RTP Payload Format for VP8 Video", draft-ietf- 4767 payload-vp8-05 (work in progress), August 2012. 4769 [RFC3984] Wenger, S., Hannuksela, M., Stockhammer, T., Westerlund, 4770 M., and D. Singer, "RTP Payload Format for H.264 Video", 4771 RFC 3984, February 2005. 4773 [RFC5583] Schierl, T. and S. Wenger, "Signaling Media Decoding 4774 Dependency in the Session Description Protocol (SDP)", RFC 4775 5583, July 2009. 4777 [RFC5576] Lennox, J., Ott, J., and T. Schierl, "Source-Specific 4778 Media Attributes in the Session Description Protocol 4779 (SDP)", RFC 5576, June 2009. 4781 [draft-ietf-rtcweb-data-channel] 4782 Jesup, R., Loreto, S., and M. Tuexen, "RTCWeb Datagram 4783 Connection", draft-ietf-rtcweb-data-channel-01 (work in 4784 progress), September 2012. 4786 [draft-ietf-mmusic-sctp-sdp] 4787 Loreto, S. and G. Camarillo, "Stream Control Transmission 4788 Protocol (SCTP)-Based Media Transport in the Session 4789 Description Protocol (SDP)", draft-ietf-mmusic-sctp-sdp-03 4790 (work in progress), September 2012. 4792 [draft-ietf-mmusic-sdp-bundle-negotiation] 4793 Holmberg, C., Alvestrand, H., and C. Jennings, 4794 "Multiplexing Negotiation Using Session Description 4795 Protocol (SDP) Port Numbers", draft-ietf-mmusic-sdp- 4796 bundle-negotiation-04 (work in progress), February 2013. 4798 [draft-roach-mmusic-unified-plan] 4799 Roach, A., Uberti, J., and M. Thomson, "A Unified Plan for 4800 Using SDP with Large Numbers of Media Flows", draft-roach- 4801 mmusic-unified-plan (work in progress), July 2013. 4803 [draft-westerlund-avtcore-rtp-simulcast] 4804 Westerlund, M., Burman, B., and S. Nandakumar, "Using 4805 Simulcast in RTP Sessions.", draft-westerlund-avtcore-rtp- 4806 simulcast (work in progress), July 2014. 4808 [draft-ivov-mmusic-trickle-ice] 4809 Roach, A., Uberti, J., and M. Thomson, "A Unified Plan for 4810 Using SDP with Large Numbers of Media Flows", draft-ivov- 4811 mmusic-trickle-ice-01 (work in progress), July 2013. 4813 [draft-lennox-mmusic-sdp-source-selection] 4814 Lennox, J. and H. Schulzrinne, "Multiplexing Negotiation 4815 Using Session Description Protocol (SDP) Port Numbers", 4816 draft-lennox-mmusic-sdp-source-selection-05 (work in 4817 progress), October 2012. 4819 [draft-rescorla-avtcore-6222bis] 4820 Rescorla, E. and A. Begen, "Guidelines for Choosing RTP 4821 Control Protocol (RTCP) Canonical Names (CNAMEs)", draft- 4822 rescorla-avtcore-6222bis-00 (work in progress), October 4823 2012. 4825 [RFC3550] Schulzrinne, H., Schulzrinne, S., Frederick, R., and V. 4826 Jacobson, "RTP: A Transport Protocol for Real-Time 4827 Applications", RFC 2326, July 2003. 4829 [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, 4830 A., Peterson, J., Sparks, R., Handley, M., and E. 4831 Schooler, "SIP: Session Initiation Protocol", RFC 3261, 4832 June 2002. 4834 [RFC2326] Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time 4835 Streaming Protocol (RTSP)", RFC 2326, April 1998. 4837 [RFC3605] Huitema, C., "Real Time Control Protocol (RTCP) attribute 4838 in Session Description Protocol (SDP)", RFC 4145, October 4839 2003. 4841 [RFC4145] Fischl, J., Tschofenig, H., and E. Rescorla, "Framework 4842 for Establishing a Secure Real-time Transport Protocol 4843 (SRTP) Security Context Using Datagram Transport Layer 4844 Security (DTLS)", RFC 4145, May 2010. 4846 [RFC2833] Schulzrinne, H. and S. Petrack, "RTP Payload for DTMF 4847 Digits, Telephony Tones and Telephony Signals", RFC 2833, 4848 May 2000. 4850 [RFC6464] Lennox, J., Ivov, E., and E. Marocco, "A Real-time 4851 Transport Protocol (RTP) Header Extension for Client-to- 4852 Mixer Audio Level Indication", RFC 6464, December 2011. 4854 [RFC6465] Ivov, E., Marocco, E., and J. Lennox, "A Real-time 4855 Transport Protocol (RTP) Header Extension for Mixer-to- 4856 Client Audio Level Indication", RFC 6465, December 2011. 4858 Authors' Addresses 4860 Suhas Nandakumar 4861 Cisco 4862 170 West Tasman Drive 4863 San Jose, CA 95134 4864 USA 4866 Email: snandaku@cisco.com 4868 Cullen Jennings 4869 Cisco 4870 170 West Tasman Drive 4871 San Jose, CA 95134 4872 USA 4874 Phone: +1 408 421-9990 4875 Email: fluffy@cisco.com