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Please replace those with straight textual mentions of the documents in question. == There are 241 instances of lines with non-RFC6890-compliant IPv4 addresses in the document. If these are example addresses, they should be changed. == There are 200 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. 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? 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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 5, 2016 August 04, 2015 7 SDP for the WebRTC 8 draft-nandakumar-rtcweb-sdp-08 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 [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 5, 2016. 45 Copyright Notice 47 Copyright (c) 2015 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 . . . . . . . . . . . . . . . . . 5 66 5. WebRTC Session Description Examples . . . . . . . . . . . . . 6 67 5.1. Some Conventions . . . . . . . . . . . . . . . . . . . . 7 68 5.2. Basic Examples . . . . . . . . . . . . . . . . . . . . . 8 69 5.2.1. Audio Only Session . . . . . . . . . . . . . . . . . 8 70 5.2.2. Audio/Video Session . . . . . . . . . . . . . . . . . 11 71 5.2.3. Data Only Session . . . . . . . . . . . . . . . . . . 16 72 5.2.4. Audio Call On Hold . . . . . . . . . . . . . . . . . 19 73 5.2.5. Audio with DTMF Session . . . . . . . . . . . . . . . 23 74 5.2.6. One Way Audio/Video Session - Document Camera . . . . 27 75 5.2.7. Audio, Video Session with BUNDLE Support Unknown . . 31 76 5.2.8. Audio, Video and Data Session . . . . . . . . . . . . 38 77 5.2.9. Audio, Video Session with BUNDLE Unsupported . . . . 43 78 5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED) . . . . 47 79 5.2.11. Audio Only, Add Video to BUNDLE . . . . . . . . . . . 52 80 5.3. MultiResolution, RTX, FEC Examples . . . . . . . . . . . 59 81 5.3.1. Sendonly Simulcast Session with 2 cameras and 2 82 encodings per camera . . . . . . . . . . . . . . 59 83 5.3.2. Successful SVC Video Session . . . . . . . . . . . . 65 84 5.3.3. Successful Simulcast Video Session with 85 Retransmission . . . . . . . . . . . . . . . . . . . 70 86 5.3.4. Successful 1-way Simulcast Sessio with 2 resolutions 87 and RTX - One resolution rejected . . . . . . 74 88 5.3.5. Simulcast Video Session with Forward Error Correction 79 89 5.4. Others . . . . . . . . . . . . . . . . . . . . . . . . . 83 90 5.4.1. Audio Session - Voice Activity Detection . . . . . . 83 91 5.4.2. Audio Conference - Voice Activity Detection . . . . . 86 92 5.4.3. Successful legacy Interop Fallaback with bundle-only 90 93 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. Informative References . . . . . . . . . . . . . . . . . . . 100 98 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 104 100 1. Introduction 102 Javascript Session Exchange Protocol(JSEP) [I-D.ietf-rtcweb-jsep] 103 specifies a generic protocol needed to generate [RFC3264] Offers and 104 Answers negotiated between the WebRTC peers for setting up, updating 105 and tearing down a WebRTC session. For this purpose, SDP is used to 106 construct [RFC3264] Offers/Answers for describing (media and non- 107 media) streams as appropriate for the recipients of the session 108 description to participate in the session. 110 The remainder of this document is organized as follows: Sections 3 111 and 4 provides an overview of SDP and the Offer/Answer exchange 112 mechanism. Section 5 provides sample SDP generated for the most 113 common WebRTC use-cases. 115 2. Terminology 117 The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT", 118 "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be 119 interpreted as described in [RFC2119]. 121 3. SDP and the WebRTC 123 The purpose of this section is to provide a general overview of SDP 124 and its components. For a more in-depth understanding, the readers 125 are advised to refer to [RFC4566]. 127 The Session Description Protocol (SDP) [RFC4566] describes multimedia 128 sessions, which can contain audio, video, whiteboard, fax, modem, and 129 other streams. SDP provides a general purpose, standard 130 representation to describe various aspects of multimedia session such 131 as media capabilities, transport addresses and related metadata in a 132 transport agnostic manner, for the purposes of session announcement, 133 session invitation and parameter negotiation. 135 As of today SDP is widely used in the context of Session Initiation 136 Protocol [RFC3261], Real-time Transport Protocol [RFC3550] and Real- 137 time Streaming Protocol applications [RFC2326]. 139 Below figure introduces high-level breakup of SDP into components 140 that semantically describe a multimedia session, in our case, a 141 WebRTC session [WebRTC]. It by no means captures everything about 142 SDP and hence, should be used for informational purposes only. 144 +---------------------+ 145 | v= | 146 +---------------------+ 147 +---------------------+ +---------------------+ 148 ==== | Session Metadata | ===== | o= | 149 | +---------------------+ +---------------------- 150 | +---------------------+ 151 | | t= | 152 | +---------------------+ 153 | 154 | 155 | +---------------------+ 156 | | c= | 157 | +---------------------+ 158 | +---------------------+ 159 ==== | Network Description | ===== 160 | +---------------------+ 161 | +---------------------+ 162 | | a=candidate | 163 | +---------------------+ 164 | 165 | 166 | +---------------------+ 167 | | m= | 168 | +---------------------+ 169 | +---------------------+ +---------------------+ 170 ==== | Stream Description | ===== | a=rtpmap | 171 | +---------------------+ +---------------------- 172 | +---------------------+ 173 | | a=fmtp | 174 | +---------------------+ 175 | +---------------------+ 176 | | a=sendrecv.. | 177 | +---------------------+ 178 +---------------+ 179 | SEMANTIC | 180 | COMPONENTS OF | 181 | SDP | 182 +---------------+ 183 | +---------------------+ 184 | | a=crypto | 185 | +---------------------+ 186 | +---------------------+ +---------------------+ 187 ==== |Security Descriptions| =====| a=ice-frag | 188 | +---------------------+ +---------------------- 189 | +---------------------+ 190 | | a=ice-pwd | 191 | +---------------------+ 192 | +---------------------+ 193 | | a=fingerprint | 194 | +---------------------+ 195 | 196 | 197 | 198 | +---------------------+ 199 | | a=rtcp-fb | 200 | +---------------------+ 201 | +---------------------+ +---------------------+ 202 ==== | Qos,Grouping | | | 203 | Descriptions | =====| a=group | 204 +---------------------+ +---------------------- 205 +---------------------+ 206 | a=rtcpmux | 207 +---------------------+ 209 Figure 1: Semantic Components of SDP 211 [WebRTC] proposes JavaScript application to fully specify and control 212 the signaling plane of a multimedia session as described in the JSEP 213 specification [I-D.ietf-rtcweb-jsep]. JSEP provides mechanisms to 214 create session characterization and media definition information to 215 conduct the session based on SDP exchanges. 217 In this context, SDP serves two purposes: 219 1. Provide grammatical structure syntactically. 221 2. Semantically convey partipant's intention and capabilities 222 required to successfully negotiate a session. 224 4. Offer/Answer and the WebRTC 226 This section introduces SDP Offer/Answer Exchange mechanism mandated 227 by WebRTC for negotiating session capabilities while setting up, 228 updating and tearing down a WebRTC session. This section is 229 intentionally brief in nature and interested readers are recommended 230 to refer [RFC3264] for specific details on the protocol operation. 232 The Offer/Answer [RFC3264] model specifies rule for the bilateral 233 exchange of Session Description Protocol (SDP) messages for creation 234 of multimedia streams. It defines protocol with involved 235 participants exchanging desired session characteristics from each 236 others perspective constructed as SDP to negotiate the session 237 between them. 239 In the most basic form,the protocol operation begins by one of the 240 participants sending an initial SDP Offer describing its intent to 241 start a multimedia communication session. The participant receiving 242 the offer MAY generate an SDP Answer accepting the offer or it MAY 243 reject the offer. If the session is accepted the Offer/Answer model 244 guarantees a common view of the multimedia session between the 245 participants. 247 At any time, either participant MAY generate a new SDP offer that 248 updates the session in progress. 250 With in the context of WebRTC, the Offer/Answer model defines the 251 state-machinery for WebRTC peers to negotiate session descriptions 252 between them during the initial setup stages as well as for eventual 253 session updates. Javascript Session Establishment Protocol 254 specification [I-D.ietf-rtcweb-jsep] for WebRTC provides the 255 mechanism for generating [RFC3264] SDP Offers and Answers in order 256 for both sides of the session to agree upon details such as list of 257 media formats to be sent/received, bandwidth information, crypto 258 parameters, transport parameters, for example. 260 5. WebRTC Session Description Examples 262 A typical web based real-time multimedia communication session can be 263 characterized as below: 265 o It has zero or more Audio only, Video only or Audio/Video RTP 266 Sessions, 268 o MAY contain zero or more non-media data sessions, 270 o All the sessions are secured with DTLS-SRTP, 272 o Supports NAT traversal using ICE mechanism, 274 o Provides RTCP based feedback mechanisms, 276 o Sessions can be over IPv4-only, IPv6-only, dual-stack based 277 clients. 279 5.1. Some Conventions 281 The examples given in this document follow the conventions listed 282 below: 284 o In all the examples, Alice and Bob are assumed to be the WebRTC 285 peers. 287 o [I-D.ietf-mmusic-sdp-bundle-negotiation] support for multiplexing 288 several media streams over a single underlying transport is 289 assumed by default unless explicitly specified otherwise. 291 o Call-flow diagrams that accompany the use-cases capture only the 292 prominent aspects of the system behavior and intentionally is not 293 detailed to improve readability. 295 o Eventhough the call-flow diagrams shows SDP being exchanged 296 between the parties, it doesn't represent the only way an WebRTC 297 setup is expected to work. Other approaches may involve WebRTC 298 applications to exchange the media setup information via non-SDP 299 mechanisms as long as they confirm to the [I-D.ietf-rtcweb-jsep] 300 API specification. 302 o The SDP examples deviate from actual on-the-wire SDP notation in 303 several ways. This is done to facilitate readability and to 304 conform to the restrictions imposed by the RFC formatting rules. 306 * Any SDP line that is indented (compared to the initial line in 307 the SDP block) is a continuation of the preceding line. The 308 line break and indent are to be interpreted as a single space 309 character. 311 * Empty lines in any SDP example are inserted to make functional 312 divisions in the SDP clearer, and are not actually part of the 313 SDP syntax. 315 * Excepting the above two conventions, line endings are to be 316 interpreted as pairs (that is, an ASCII 13 followed by 317 an ASCII 10). 319 o Against each SDP line, pointers to the appropriate RFCs are 320 provided for further informational reference. Also an attempt has 321 been made to provide explanatory notes to enable better 322 understanding of the SDP usage, wherever appropriate. 324 o Following SDP details are common across all the use-cases defined 325 in this document unless mentioned otherwise. 327 * DTLS fingerprint for SRTP (a=fingerprint) 329 * RTP/RTCP Multiplexing (a=rtcp-mux) 331 * RTCP Feedback support (a=rtcp-fb) 333 * Host and server-reflexive candidate lines (a=candidate) 335 * SRTP Setup framework parameters (a=setup) 337 * RTCP attribute (a=rtcp) 339 * RTP header extension indicating audio-levels from client to the 340 mixer 342 For more details, readers are recommended to refer to 343 [I-D.ietf-rtcweb-jsep] specification. 345 o The term "Session" is used rather loosely in this document to 346 refer to either a "Communication Session" or a "RTP Session" or a 347 "RTP Stream" depending on the context. 349 o Payload type 109 is usually used for OPUS, 0 for PCMU, 8 for PCMA, 350 99 for H.264 and 120 for VP8 in most of the examples to maintain 351 uniformity. 353 o In the actual use the values that represent SSRCs, ICE candidate 354 foundations, WebRTC Mediastream and MediaStreamTrack Ids shall be 355 much larger and random than the ones shown in the examples. 357 [OPEN ISSUE-1]: SDP Examples for Data Channel, Simulcast, SVC are 358 still being discussed and doesn't represent the final solution. 360 5.2. Basic Examples 362 5.2.1. Audio Only Session 364 This common scenario shows SDP for secure two-way audio session with 365 Alice offering Opus, PCMU, PCMA and Bob accepting all the offered 366 audio codecs. 368 2-Way Audio Only Session 370 Alice Bob 371 | | 372 | | 373 | Offer(Audio:Opus,PCMU,PCMA) | 374 |------------------------------------>| 375 | | 376 | | 377 | Answer(Audio:Opus,PCMU,PCMA) | 378 |<------------------------------------| 379 | | 380 | | 381 |Two-way Opus Audio (preferred-codec) | 382 |.....................................| 383 | | 384 | | 386 +----------------------------------+--------------------------------+ 387 | SDP Contents | RFC#/Notes | 388 +----------------------------------+--------------------------------+ 389 | v=0 | [RFC4566] | 390 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 391 | | Information | 392 | s=- | [RFC4566] | 393 | t=0 0 | [RFC4566] | 394 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 395 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 396 | | gotiation] | 397 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 398 | 109 0 8 | | 399 | c=IN IP4 24.23.204.141 | [RFC4566] | 400 | a=mid:audio | [RFC5888] | 401 | a=msid:ma ta | Identifies RTCMediaStream ID | 402 | | (ma) and RTCMediaStreamTrack | 403 | | ID (ta) | 404 | a=rtcp-mux | [RFC5761] - Alice can perform | 405 | | RTP/RTCP Muxing | 406 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 407 | 24.23.204.141 | | 408 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 409 | | Opus Codec 48khz, 2 channels | 410 | a=ptime:60 | [I-D.ietf-payload-rtp-opus] - | 411 | | Opus packetization of 60ms | 412 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 413 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 414 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Alice supports RTP | 415 | hdrext:ssrc-audio-level | header extension to indicate | 416 | | audio levels | 417 | a=sendrecv | [RFC3264] - Alice can send and | 418 | | recv audio | 419 | a=setup:actpass | [RFC4145] - Alice can perform | 420 | | DTLS before Answer arrives | 421 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 422 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | 423 | : 1f:66:79:a8:07 | | 424 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | 425 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | 426 | 474af08a068 | | 427 | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host Candidate | 428 | 192.168.1.4 54609 typ host | | 429 | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP Host | 430 | 192.168.1.4 54609 typ host | Candidate | 431 | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | 432 | 24.23.204.141 64678 typ srflx | Reflexive ICE Candidate | 433 | raddr 192.168.1.4 rport 54609 | | 434 | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | 435 | 24.23.204.141 64678 typ srflx | Reflexive Candidate | 436 | raddr 192.168.1.4 rport 54609 | | 437 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 438 | | RTCP feedback support | 439 | a=ssrc:12345 | [RFC5576] | 440 | cname:EocUG1f0fcg/yvY7 | | 441 | a=rtcp-rsize | [RFC5506] - Alice intends to | 442 | | use reduced size RTCP for this | 443 | | session | 444 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 445 +----------------------------------+--------------------------------+ 447 Table 1: 5.2.1 SDP Offer 449 +----------------------------------+--------------------------------+ 450 | SDP Contents | RFC#/Notes | 451 +----------------------------------+--------------------------------+ 452 | v=0 | [RFC4566] | 453 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 454 | | Information | 455 | s=- | [RFC4566] | 456 | t=0 0 | [RFC4566] | 457 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 458 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 459 | | gotiation] | 460 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 461 | 109 0 8 | | 462 | c=IN IP4 98.248.92.77 | [RFC4566] | 463 | a=mid:audio | [RFC5888] | 464 | a=msid:ma ta | Identifies RTCMediaStream ID | 465 | | (ma) and RTCMediaStreamTrack | 466 | | ID (ta) | 467 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 468 | | Opus Codec | 469 | a=ptime:60 | [I-D.ietf-payload-rtp-opus] | 470 | | Packetization of 60ms | 471 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 472 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 473 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] Bob supports audio | 474 | hdrext:ssrc-audio-level | level RTP header extension as | 475 | | well | 476 | a=sendrecv | [RFC3264] - Bob can send and | 477 | | recv audio | 478 | a=setup:active | [RFC4145] - Bob carries out | 479 | | DTLS Handshake in parallel | 480 | a=rtcp-mux | [RFC5761] - Bob can perform | 481 | | RTP/RTCP Muxing on port 49203 | 482 | a=fingerprint:sha-1 c9:c7:70:9d: | [RFC5245] - DTLS Fingerprint | 483 | 1f:66:79:a8:07:99:41:49:83:4a: | for SRTP | 484 | 97:0e:1f:ef:6d:f7 | | 485 | a=ice-ufrag:05067423 | [RFC5245] - ICE user fragment | 486 | a=ice-pwd:1747d1ee3474a28a397a4c | [RFC5245] - ICE password | 487 | 3f3af08a068 | parameter | 488 | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP/RTCP Host ICE | 489 | 192.168.1.7 49203 typ host | Candidate | 490 | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP/RTCP Server | 491 | 98.248.92.77 60654 typ srflx | Reflexive ICE Candidate | 492 | raddr 192.168.1.7 rport 49203 | | 493 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 494 | | RTCP feedback support | 495 | a=ssrc:54321 | [RFC5576] | 496 | cname:NWs1ao1HmN4Xa5/yvY7 | | 497 | a=rtcp-rsize | [RFC5506] - Bob intends to use | 498 | | reduced size RTCP for this | 499 | | session | 500 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 501 +----------------------------------+--------------------------------+ 503 Table 2: 5.2.1 SDP Answer 505 5.2.2. Audio/Video Session 507 Alice and Bob establish a two-way audio and video session with Opus 508 as the audio codec and H.264 as the video codec. 510 2-Way Audio,Video Session 512 Alice Bob 513 | | 514 | | 515 |Offer(Audio:Opus,PCMU,PCMA Video:H.264,VP8) | 516 |------------------------------------------->| 517 | | 518 | | 519 | Answer(Audio:Opus,Video:H.264) | 520 |<-------------------------------------------| 521 | | 522 | | 523 | Two-way Opus Audio, H.264 Video | 524 |............................................| 525 | | 527 +----------------------------------+--------------------------------+ 528 | SDP Contents | RFC#/Notes | 529 +----------------------------------+--------------------------------+ 530 | v=0 | [RFC4566] | 531 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 532 | | Information | 533 | s=- | [RFC4566] | 534 | t=0 0 | [RFC4566] | 535 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 536 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 537 | | gotiation] | 538 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 539 | 109 0 8 | | 540 | c=IN IP4 24.23.204.141 | [RFC4566] | 541 | a=mid:audio | [RFC5888] | 542 | a=msid:ma ta | Identifies RTCMediaStream ID | 543 | | (ma) and RTCMediaStreamTrack | 544 | | ID (ta) | 545 | a=rtcp-mux | [RFC5761] - Alice can perform | 546 | | RTP/RTCP Muxing | 547 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 548 | 24.23.204.141 | | 549 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 550 | | Opus Codec 48khz, 2 channels | 551 | a=ptime:60 | [I-D.ietf-payload-rtp-opus] - | 552 | | Opus packetization of 60ms | 553 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 554 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 555 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 556 | hdrext:ssrc-audio-level | | 557 | a=sendrecv | [RFC3264] - Alice can send and | 558 | | recv audio | 559 | a=setup:actpass | [RFC4145] - Alice can perform | 560 | | DTLS before Answer arrives | 561 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | 562 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | 563 | 474af08a068 | parameter | 564 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 565 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | 566 | : 1f:66:79:a8:07 | | 567 | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host Candidate | 568 | 192.168.1.4 54609 typ host | | 569 | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP Host | 570 | 192.168.1.4 54609 typ host | Candidate | 571 | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | 572 | 24.23.204.141 64678 typ srflx | Reflexive ICE Candidate | 573 | raddr 192.168.1.4 rport 54609 | | 574 | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | 575 | 24.23.204.141 64678 typ srflx | Reflexive Candidate. | 576 | raddr 192.168.1.4 rport 54609 | | 577 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 578 | | RTCP feedback support | 579 | a=ssrc:12345 | [RFC5576] | 580 | cname:EocUG1f0fcg/yvY7 | | 581 | a=rtcp-rsize | [RFC5506] - Alice intends to | 582 | | use reduced size RTCP for this | 583 | | session | 584 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 585 | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 586 | 99 120 | | 587 | c=IN IP4 24.23.204.141 | [RFC4566] | 588 | a=mid:video | [RFC5888] | 589 | a=msid:ma tb | Identifies RTCMediaStream ID | 590 | | (ma) and RTCMediaStreamTrack | 591 | | ID (tb) | 592 | a=rtcp-mux | [RFC5761] - Alice can perform | 593 | | RTP/RTCP Muxing | 594 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 595 | 24.23.204.141 | | 596 | a=rtpmap:99 H264/90000 | [RFC3984] - H.264 Video Codec | 597 | a=fmtp:99 profile-level- | [RFC3984] | 598 | id=4d0028;packetization-mode=1 | | 599 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] - VP8 | 600 | | video codec | 601 | a=sendrecv | [RFC3264] - Alice can send and | 602 | | recv video | 603 | a=setup:actpass | [RFC4145] - Alice can perform | 604 | | DTLS before Answer arrives | 605 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | 606 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | 607 | 474af08a068 | parameter | 608 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 609 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | 610 | 9d:1f:66:79:a8:07 | | 611 | a=candidate:0 1 UDP 2122194687 | [RFC5245] - RTP Host ICE | 612 | 192.168.1.4 54609 typ host | Candidate | 613 | a=candidate:0 2 UDP 2122194687 | [RFC5245] - RTCP Host | 614 | 192.168.1.4 54609 typ host | Candidate | 615 | a=candidate:1 1 UDP 1685987071 | [RFC5245] - RTP Server | 616 | 24.23.204.141 64678 typ srflx | Reflexive ICE Candidate | 617 | raddr 192.168.1.4 rport 54609 | | 618 | a=candidate:1 2 UDP 1685987071 | [RFC5245] - RTCP Server | 619 | 24.23.204.141 64678 typ srflx | Reflexive Candidate | 620 | raddr 192.168.1.4 rport 54609 | | 621 | a=rtcp-fb:99 nack | [RFC5104] - Indicates NACK | 622 | | RTCP feedback support | 623 | a=rtcp-fb:99 nack pli | [RFC5104] - Indicates support | 624 | | for Picture loss Indication | 625 | | and NACK | 626 | a=rtcp-fb:99 ccm fir | [RFC5104] - Full Intra Frame | 627 | | Request-Codec Control Message | 628 | | support | 629 | a=rtcp-fb:120 nack | [RFC5104] - Indicates NACK | 630 | | RTCP feedback support | 631 | a=rtcp-fb:120 nack pli | [RFC5104] - Indicates support | 632 | | for Picture loss Indication | 633 | | and NACK | 634 | a=rtcp-fb:120 ccm fir | [RFC5104] - Full Intra Frame | 635 | | Request-Codec Control Message | 636 | | support | 637 | a=ssrc:1366781083 | [RFC5576] | 638 | cname:EocUG1f0fcg/yvY7 | | 639 | a=rtcp-rsize | [RFC5506] - Alice intends to | 640 | | use reduced size RTCP for this | 641 | | session | 642 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 643 +----------------------------------+--------------------------------+ 645 Table 3: 5.2.2 SDP Offer 647 +----------------------------------+--------------------------------+ 648 | SDP Contents | RFC#/Notes | 649 +----------------------------------+--------------------------------+ 650 | v=0 | [RFC4566] | 651 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 652 | | Information | 653 | s=- | [RFC4566] | 654 | t=0 0 | [RFC4566] | 655 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 656 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 657 | | gotiation] | 658 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 659 | 109 | | 660 | c=IN IP4 98.248.92.77 | [RFC4566] | 661 | a=mid:audio | [RFC5888] | 662 | a=msid:ma ta | Identifies RTCMediaStream ID | 663 | | (ma) and RTCMediaStreamTrack | 664 | | ID (ta) | 665 | a=rtcp-mux | [RFC5761] - Bob can perform | 666 | | RTP/RTCP Muxing | 667 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 668 | | Bob accepts only Opus Codec | 669 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 670 | hdrext:ssrc-audio-level | | 671 | a=ptime:60 | [I-D.ietf-payload-rtp-opus] | 672 | a=sendrecv | [RFC3264] - Bob can send and | 673 | | recv audio | 674 | a=setup:active | [RFC4145] - Bob carries out | 675 | | DTLS Handshake in parallel | 676 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | 677 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | 678 | 7efbabd9a2 | | 679 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 680 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | 681 | 9d:1f:66:79:a8:07 | | 682 | a=candidate:0 1 UDP 3618095783 | [RFC5245] - RTP/RTCP Host ICE | 683 | 192.168.1.7 49203 typ host | Candidate | 684 | a=candidate:1 1 UDP 565689203 | [RFC5245] - RTP/RTCP Server | 685 | 98.248.92.77 60065 typ srflx | Reflexive ICE Candidate | 686 | raddr 192.168.1.7 rport 49203 | | 687 | a=ssrc:1366788312 | [RFC5576] | 688 | cname:1f0fcgEocUG/yvY7 | | 689 | a=rtcp-rsize | [RFC5506] - Bob intends to use | 690 | | reduced size RTCP for this | 691 | | session | 692 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 693 | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 694 | 99 | | 695 | c=IN IP4 98.248.92.77 | [RFC4566] | 696 | a=mid:video | [RFC5888] | 697 | a=msid:ma tb | Identifies RTCMediaStream ID | 698 | | (ma) and RTCMediaStreamTrack | 699 | | ID (tb) | 700 | a=rtpmap:99 H264/90000 | [RFC3984] - Bob accepts H.264 | 701 | | Video Codec. | 702 | a=fmtp:99 profile-level- | [RFC3984] | 703 | id=4d0028;packetization-mode=1 | | 704 | a=rtcp-mux | [RFC5761] - Bob can perform | 705 | | RTP/RTCP Muxing | 706 | a=sendrecv | [RFC3264] - Bob can send and | 707 | | recv video | 708 | a=setup:active | [RFC4145] - Bob carries out | 709 | | DTLS Handshake in parallel | 710 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | 711 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | 712 | 7efbabd9a2 | | 713 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 714 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | 715 | 9d:1f:66:79:a8:07 | | 716 | a=candidate:0 1 UDP 2113667327 | [RFC5245] - Host ICE Candidate | 717 | 192.168.1.7 49203 typ host | for Opus Stream | 718 | a=candidate:1 1 UDP 1694302207 | [RFC5245] - Server Reflexive | 719 | 98.248.92.77 60065 typ srflx | ICE Candidate for the above | 720 | raddr 192.168.1.7 rport 49203 | host candidate | 721 | [RFC5245] - Server Reflexive | a=rtcp-fb:99 nack | 722 | Candidate for the Second Host | | 723 | Candidate | | 724 | [RFC5104] - Indicates support | a=rtcp-fb:99 nack pli | 725 | for NACK based RTCP feedback | | 726 | [RFC5104] - Indicates support | a=rtcp-fb:99 ccm fir | 727 | for Picture loss Indication and | | 728 | NACK | | 729 | [RFC5104] - Full Intra Frame | a=ssrc:3229706345 | 730 | Request- Codec Control Message | cname:Q/NWs1ao1HmN4Xa5 | 731 | support | | 732 | [RFC5576] | a=rtcp-rsize | 733 | [RFC5506] - Bob intends to use | a=ice-options:trickle | 734 | reduced size RTCP for this | | 735 | session | | 736 | [I-D.ietf-mmusic-trickle-ice] | 737 +----------------------------------+--------------------------------+ 739 Table 4: 5.2.2 SDP Answer 741 5.2.3. Data Only Session 743 This scenario illustrates SDP negotiated to setup a data-only session 744 based on SCTP Data Channel, thus enabling use-cases such as file- 745 transfer for example. 747 2-Way DataChannel Session 749 Alice Bob 750 | | 751 | | 752 | | 753 | Offer(DataChannel) | 754 |-------------------------------->| 755 | | 756 | | 757 | Answer(DataChannel) | 758 |<--------------------------------| 759 | | 760 | | 761 | Two-way SCTP based DataChannel | 762 |.................................| 763 | | 764 | | 765 +----------------------------------+--------------------------------+ 766 | SDP Contents | RFC#/Notes | 767 +----------------------------------+--------------------------------+ 768 | v=0 | [RFC4566] | 769 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 770 | | Information | 771 | s=- | [RFC4566] | 772 | t=0 0 | [RFC4566] | 773 | a=group:BUNDLE data | [I-D.ietf-mmusic-sdp-bundle-ne | 774 | | gotiation] | 775 | a=ice-ufrag:074c6550 | [RFC5245] - Session Level ICE | 776 | | parameter | 777 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - Session Level ICE | 778 | 474af08a068 | parameter | 779 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Session DTLS | 780 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | Fingerprint for SRTP | 781 | 9d:1f:66:79:a8:07 | | 782 | m=application 56966 DTLS/SCTP | [I-D.ietf-rtcweb-data-channel] | 783 | 5000 | | 784 | c=IN IP4 24.23.204.141 | [RFC4566] | 785 | a=mid:data | [RFC5888] | 786 | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | 787 | DataChannel | | 788 | streams=16;label="channel 1"; | | 789 | subprotocol="chat"; | | 790 | a=setup:actpass | [RFC4145] - Alice can perform | 791 | | DTLS before Answer arrives | 792 | a=sendrecv | [RFC3264] - Alice can send and | 793 | | recv non-media data | 794 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 795 | 192.168.1.7 56966 typ host | | 796 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 797 | 24.23.204.141 56966 typ srflx | | 798 | raddr 192.168.1.7 rport 56966 | | 799 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 800 +----------------------------------+--------------------------------+ 802 Table 5: 5.2.3 SDP Offer 804 +----------------------------------+--------------------------------+ 805 | SDP Contents | RFC#/Notes | 806 +----------------------------------+--------------------------------+ 807 | v=0 | [RFC4566] | 808 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 809 | | Information | 810 | s=- | [RFC4566] | 811 | t=0 0 | [RFC4566] | 812 | a=group:BUNDLE data | [I-D.ietf-mmusic-sdp-bundle-ne | 813 | | gotiation] | 814 | m=application 55700 DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | 815 | 5000 | | 816 | c=IN IP4 98.248.92.771 | [RFC4566] | 817 | a=mid:data | [RFC5888] | 818 | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | 819 | DataChannel:5000 | | 820 | streams=1;label="channel 1" | | 821 | ;subprotocol="chat"; | | 822 | a=setup:active | [RFC4145] - Bob carries out | 823 | | DTLS Handshake in parallel | 824 | a=sendrecv | [RFC3264] - Bob can send and | 825 | | recv non-media data | 826 | a=ice-ufrag:c300d85b | [RFC5245] - Session Level ICE | 827 | | username frag | 828 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - Session Level ICE | 829 | 7efbabd9a2 | password | 830 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Session DTLS | 831 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | Fingerprint for SRTP | 832 | : 1f:66:79:a8:07 | | 833 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 834 | 192.168.1.7 55700 typ host | | 835 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 836 | 98.248.92.77 55700 typ srflx | | 837 | raddr 192.168.1.7 rport 55700 | | 838 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 839 +----------------------------------+--------------------------------+ 841 Table 6: 5.2.3 SDP Answer 843 5.2.4. Audio Call On Hold 845 Alice calls Bob, but when Bob answers he places Alice on hold by 846 setting the SDP direction attribute to a=sendonly in the Answer. 848 Audio On Hold 850 Alice Bob 851 | | 852 | | 853 | Offer(Audio:Opus) | 854 |-------------------------------->| 855 | | 856 | | 857 | Answer(Audio:Opus,a=sendonly) | 858 |<--------------------------------| 859 | | 860 | | 861 | One-way Opus Audio | 862 |.................................| 863 | | 864 | 866 +----------------------------------+--------------------------------+ 867 | SDP Contents | RFC#/Notes | 868 +----------------------------------+--------------------------------+ 869 | v=0 | [RFC4566] | 870 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 871 | | Information | 872 | s=- | [RFC4566] | 873 | t=0 0 | [RFC4566] | 874 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 875 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 876 | | gotiation] | 877 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 878 | 109 | | 879 | c=IN IP4 24.23.204.141 | [RFC4566] | 880 | a=mid:audio | [RFC5888] | 881 | a=msid:ma ta | Identifies RTCMediaStream ID | 882 | | (ma) and RTCMediaStreamTrack | 883 | | ID (ta) | 884 | a=rtcp-mux | [RFC5761] - Alice can perform | 885 | | RTP/RTCP Muxing | 886 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 887 | 24.23.204.141 | | 888 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 889 | | Opus Codec 48khz, 2 channels | 890 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 891 | hdrext:ssrc-audio-level | | 892 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] - | 893 | | Opus packetization of 20ms | 894 | a=sendrecv | [RFC3264] - Alice can send and | 895 | | recv audio | 896 | a=setup:actpass | [RFC4145] - Alice can perform | 897 | | DTLS before Answer arrives | 898 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | 899 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | 900 | 474af08a068 | | 901 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 902 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | 903 | 9d:1f:66:79:a8:07 | | 904 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 905 | 192.168.1.4 54609 typ host | | 906 | a=candidate:0 2 UDP 2113667327 | [RFC5245] | 907 | 192.168.1.4 54609 typ host | | 908 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 909 | 24.23.204.141 54609 typ srflx | | 910 | raddr 192.168.1.4 rport 54609 | | 911 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 912 | 24.23.204.141 54609 typ srflx | | 913 | raddr 192.168.1.4 rport 54609 | | 914 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 915 | | RTCP feedback support | 916 | a=ssrc:3229706345 | [RFC5576] | 917 | cname:Q/NWs1ao1HmN4Xa5 | | 918 | a=rtcp-rsize | [RFC5506] | 919 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 920 +----------------------------------+--------------------------------+ 922 Table 7: 5.2.4 SDP Offer 924 +----------------------------------+--------------------------------+ 925 | SDP Contents | RFC#/Notes | 926 +----------------------------------+--------------------------------+ 927 | v=0 | [RFC4566] | 928 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 929 | | Information | 930 | s=- | [RFC4566] | 931 | t=0 0 | [RFC4566] | 932 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 933 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 934 | | gotiation] | 935 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 936 | 109 | | 937 | c=IN IP4 98.248.92.77 | [RFC4566] | 938 | a=mid:audio | [RFC5888] | 939 | a=msid:ma ta | Identifies RTCMediaStream ID | 940 | | (ma) and RTCMediaStreamTrack | 941 | | ID (ta) | 942 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 943 | | Bob accepts Opus Codec | 944 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 945 | hdrext:ssrc-audio-level | | 946 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 947 | a=sendonly | [RFC3264] - Bob puts call On | 948 | | Hold | 949 | a=setup:active | [RFC4145] - Bob carries out | 950 | | DTLS Handshake in parallel | 951 | a=rtcp-mux | [RFC5761] - Bob can perform | 952 | | RTP/RTCP Muxing | 953 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | 954 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | 955 | 7efbabd9a2 | | 956 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 957 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | 958 | : 1f:66:79:a8:07 | | 959 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 960 | 192.168.1.7 49203 typ host | | 961 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 962 | 98.248.92.77 49203 typ srflx | | 963 | raddr 192.168.1.7 rport 49203 | | 964 | a=ssrc:1366781083 | [RFC5576] | 965 | cname:EocUG1f0fcg/yvY7 | | 966 | a=rtcp-rsize | [RFC5506] | 967 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 968 +----------------------------------+--------------------------------+ 970 Table 8: 5.2.4 SDP Answer 972 5.2.5. Audio with DTMF Session 974 In this example, Alice wishes to establish two separate audio 975 streams, one for normal audio and the other for telephone-events. 976 Alice offers first audio stream with three codecs and the other with 977 [RFC2833] tones (for DTMF). Bob accepts both the audio streams by 978 choosing Opus as the audio codec and telephone-event for the other 979 stream. 981 Audio Session with DTMF 983 Alice Bob 984 | | 985 | | 986 | | 987 | Offer(Audio:Opus,PCMU,PCMA Audio:telephone-event)| 988 |-------------------------------------------------->| 989 | | 990 | | 991 | Answer(Audio:Opus, Audio:telephone-event) | 992 |<--------------------------------------------------| 993 | | 994 | | 995 | Opus audio stream and telephone-event stream | 996 |...................................................| 997 | | 999 +----------------------------------+--------------------------------+ 1000 | SDP Contents | RFC#/Notes | 1001 +----------------------------------+--------------------------------+ 1002 | v=0 | [RFC4566] | 1003 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 1004 | | Information | 1005 | s=- | [RFC4566] | 1006 | t=0 0 | [RFC4566] | 1007 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1008 | a=group:BUNDLE audio dtmf | [I-D.ietf-mmusic-sdp-bundle-ne | 1009 | | gotiation] | 1010 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1011 | 109 0 8 | | 1012 | c=IN IP4 24.23.204.141 | [RFC4566] | 1013 | a=mid:audio | [RFC5888] | 1014 | a=msid:ma ta | Identifies RTCMediaStream ID | 1015 | | (ma) and RTCMediaStreamTrack | 1016 | | ID (ta) | 1017 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 1018 | 24.23.204.141 | | 1019 | a=rtcp-mux | [RFC5761] - Alice can perform | 1020 | | RTP/RTCP Muxing | 1021 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 1022 | | Opus Codec 48khz, 2 channels | 1023 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] - | 1024 | | Opus packetization of 20ms | 1025 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 1026 | a=rtpmap:8 PCMA/8000 | [RFC3551] PCMA Audio Codec | 1027 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1028 | hdrext:ssrc-audio-level | | 1029 | a=sendrecv | [RFC3264] - Alice can send and | 1030 | | recv audio | 1031 | a=setup:actpass | [RFC4145] - Alice can perform | 1032 | | DTLS before Answer arrives | 1033 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | 1034 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | 1035 | 474af08a068 | parameter | 1036 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 1037 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | for SRTP | 1038 | 9d:1f:66:79:a8:07 | | 1039 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1040 | 192.168.1.4 54609 typ host | | 1041 | a=candidate:0 2 UDP 2122194687 | [RFC5245] | 1042 | 192.168.1.4 54609 typ host | | 1043 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1044 | 24.23.204.141 54609 typ srflx | | 1045 | raddr 192.168.1.4 rport 54609 | | 1046 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 1047 | 24.23.204.141 54609 typ srflx | | 1048 | raddr 192.168.1.4 rport 54609 | | 1049 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 1050 | | RTCP feedback support | 1051 | a=ssrc:3229706345 | [RFC5576] | 1052 | cname:Q/NWs1ao1HmN4Xa5 | | 1053 | a=rtcp-rsize | [RFC5506] | 1054 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1055 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1056 | 126 | | 1057 | c=IN IP4 24.23.204.141 | [RFC4566] | 1058 | a=mid:dtmf | [RFC5888] | 1059 | a=msid:ma tb | Identifies RTCMediaStream ID | 1060 | | (ma) and RTCMediaStreamTrack | 1061 | | ID (tb) | 1062 | a=rtcp-mux | [RFC5761] | 1063 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 1064 | 24.23.204.141 | | 1065 | a=rtpmap:126 telephone- | [RFC2833] | 1066 | event/8000 | | 1067 | a=sendonly | [RFC3264] - Alice can send | 1068 | | DTMF Events | 1069 | a=setup:actpass | [RFC4145] - Alice can perform | 1070 | | DTLS before Answer arrives | 1071 | a=ice-ufrag:074c6550 | [RFC5245] - ICE user fragment | 1072 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] - ICE password | 1073 | 474af08a068 | parameter | 1074 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - DTLS Fingerprint | 1075 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | for SRTP | 1076 | : 1f:66:79:a8:07 | | 1077 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1078 | 192.168.1.4 54609 typ host | | 1079 | a=candidate:0 2 UDP 2122194687 | [RFC5245] | 1080 | 192.168.1.4 54609 typ host | | 1081 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1082 | 24.23.204.141 54609 typ srflx | | 1083 | raddr 192.168.1.4 rport 54609 | | 1084 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 1085 | 24.23.204.141 54609 typ srflx | | 1086 | raddr 192.168.1.4 rport 54609 | | 1087 | a=rtcp-fb:109 nack | [RFC5104] - Indicates NACK | 1088 | | RTCP feedback support | 1089 | a=ssrc:9032206345 | [RFC5576] | 1090 | cname:L/N9lk1ao1HmN4Xa5 | | 1091 | a=rtcp-rsize | [RFC5506] | 1092 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1093 +----------------------------------+--------------------------------+ 1095 Table 9: 5.2.5 SDP Offer 1097 +----------------------------------+--------------------------------+ 1098 | SDP Contents | RFC#/Notes | 1099 +----------------------------------+--------------------------------+ 1100 | v=0 | [RFC4566] | 1101 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 1102 | | Information | 1103 | s=- | [RFC4566] | 1104 | t=0 0 | [RFC4566] | 1105 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1106 | a=group:BUNDLE audio dtmf | [I-D.ietf-mmusic-sdp-bundle-ne | 1107 | | gotiation] | 1108 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1109 | 109 | | 1110 | c=IN IP4 98.248.92.77 | [RFC4566] | 1111 | a=mid:audio | [RFC5888] | 1112 | a=msid:ma ta | Identifies RTCMediaStream ID | 1113 | | (ma) and RTCMediaStreamTrack | 1114 | | ID (ta) | 1115 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 1116 | | Bob accepts Opus Codec | 1117 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1118 | hdrext:ssrc-audio-level | | 1119 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1120 | a=sendrecv | [RFC3264] - Bob can send and | 1121 | | receive Opus audio | 1122 | a=setup:active | [RFC4145] - Bob carries out | 1123 | | DTLS Handshake in parallel | 1124 | a=rtcp-mux | [RFC5761] - Bob can perform | 1125 | | RTP/RTCP Muxing on port 49203 | 1126 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | 1127 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | 1128 | 7efbabd9a2 | | 1129 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Fingerprint for | 1130 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | SRTP | 1131 | 9d:1f:66:79:a8:07 | | 1132 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1133 | 192.168.1.7 49203 typ host | | 1134 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1135 | 98.248.92.77 49203 typ srflx | | 1136 | raddr 192.168.1.7 rport 49203 | | 1137 | a=ssrc:0634322975 | [RFC5576] | 1138 | cname:Q/o1HmN4XNWs1aa5 | | 1139 | a=rtcp-rsize | [RFC5506] - Alice intends to | 1140 | | use reduced size RTCP for this | 1141 | | session | 1142 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1143 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1144 | 126 | | 1145 | c=IN IP4 98.248.92.77 | [RFC4566] | 1146 | a=mid:dtmf | [RFC5888] | 1147 | a=msid:ma tb | Identifies RTCMediaStream ID | 1148 | | (ma) and RTCMediaStreamTrack | 1149 | | ID (tb) | 1150 | a=rtpmap:126 telephone- | [RFC2833] | 1151 | event/8000 | | 1152 | a=recvonly | [RFC3264] - Alice can receive | 1153 | | DTMF events | 1154 | a=setup:active | [RFC4145] - Bob carries out | 1155 | | DTLS Handshake in parallel | 1156 | a=rtcp-mux | [RFC5761] - Alice can perform | 1157 | | RTP/RTCP Muxing on port 54690 | 1158 | a=ice-ufrag:c300d85b | [RFC5245] - ICE username frag | 1159 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] - ICE password | 1160 | 7efbabd9a2 | | 1161 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] - Fingerprint for | 1162 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | SRTP | 1163 | : 1f:66:79:a8:07 | | 1164 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1165 | 192.168.1.7 49203 typ host | | 1166 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 1167 | 98.248.92.77 49203 typ srflx | | 1168 | raddr 192.168.1.7 rport 49203 | | 1169 | a=ssrc:6345903220 | [RFC5576] | 1170 | cname:L/k1aN9lo1HmN4Xa5 | | 1171 | a=rtcp-rsize | [RFC5506] - Alice intends to | 1172 | | use reduced size RTCP for this | 1173 | | session | 1174 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1175 +----------------------------------+--------------------------------+ 1177 Table 10: 5.2.5 SDP Answer 1179 5.2.6. One Way Audio/Video Session - Document Camera 1181 In this scenario Alice and Bob engage in a 1 way audio and video 1182 session with Bob receiving Alice's audio and her presentation slides 1183 as video stream. 1185 One Way Audio & Video Session - Document Camera 1187 Alice Bob 1188 | | 1189 | | 1190 | | 1191 | Alice Offers sendonly audio and video streams. | 1192 | The video stream corresponds to her presentation | 1193 | | 1194 | Offer(Audio:Opus, Video: VP8) | 1195 |----------------------------------------------------->| 1196 | | 1197 | | 1198 | (Audio:Opus, Video: VP8) | 1199 |<-----------------------------------------------------| 1200 | | 1201 | | 1202 | One-way Opus Audio, VP8 Video | 1203 |......................................................| 1204 | Bob can hear Alice and see her presentation slides.| 1205 | | 1206 | | 1207 +----------------------------------+--------------------------------+ 1208 | SDP Contents | RFC#/Notes | 1209 +----------------------------------+--------------------------------+ 1210 | v=0 | [RFC4566] | 1211 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 1212 | s=- | [RFC4566] | 1213 | t=0 0 | [RFC4566] | 1214 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1215 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 1216 | | gotiation] | 1217 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1218 | 109 | | 1219 | c=IN IP4 24.23.204.141 | [RFC4566] | 1220 | a=mid:audio | [RFC5888] | 1221 | a=msid:ma ta | Identifies RTCMediaStream ID | 1222 | | (ma) and RTCMediaStreamTrack | 1223 | | ID (ta) | 1224 | a=rtcp-mux | [RFC5761] | 1225 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 1226 | 24.23.204.141 | | 1227 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1228 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1229 | hdrext:ssrc-audio-level | | 1230 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1231 | a=sendonly | [RFC3264] - Send only audio | 1232 | | stream | 1233 | a=setup:actpass | [RFC4145] - Alice can perform | 1234 | | DTLS before Answer arrives | 1235 | a=ice-ufrag:074c6550 | [RFC5245] | 1236 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1237 | 474af08a068 | | 1238 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1239 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1240 | 9d:1f:66:79:a8:07 | | 1241 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1242 | 24.23.204.141 54609 typ host | | 1243 | a=candidate:0 2 UDP 2122194687 | [RFC5104] | 1244 | 24.23.204.141 54609 typ host | | 1245 | a=rtcp-fb:109 nack | [RFC5104] | 1246 | a=ssrc:6345903220 | [RFC5576] | 1247 | cname:L/k1aN9lo1HmN4Xa5 | | 1248 | a=rtcp-rsize | [RFC5506] | 1249 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1250 | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1251 | 120 | | 1252 | c=IN IP4 24.23.204.141 | [RFC4566] | 1253 | a=mid:video | [RFC5888] | 1254 | a=msid:ma tb | Identifies RTCMediaStream ID | 1255 | | (ma) and RTCMediaStreamTrack | 1256 | | ID (tb) | 1257 | a=rtcp-mux | [RFC5761] | 1258 | a=rtcp:54609 IN IP4 | [RFC3605] - Port for RTCP data | 1259 | 24.23.204.141 | | 1260 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1261 | a=content:slides | [RFC4796] -Alice's | 1262 | | presentation video stream | 1263 | a=sendonly | [RFC3264] - Send only video | 1264 | | stream | 1265 | a=setup:actpass | [RFC4145] - Alice can perform | 1266 | | DTLS before Answer arrives | 1267 | a=ice-ufrag:074c6550 | [RFC5245] | 1268 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1269 | 474af08a068 | | 1270 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1271 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1272 | 9d:1f:66:79:a8:07 | | 1273 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1274 | 24.23.204.141 54609 typ host | | 1275 | a=candidate:0 2 UDP 2113667326 | [RFC5104] | 1276 | 24.23.204.141 54609 typ host | | 1277 | a=rtcp-fb:120 nack | [RFC5104] | 1278 | a=rtcp-fb:120 nack pli | [RFC5104] | 1279 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1280 | a=ssrc:3429951804 | [RFC5576] | 1281 | cname:Q/NWs1ao1HmN4Xa5 | | 1282 | a=rtcp-rsize | [RFC5506] | 1283 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1284 +----------------------------------+--------------------------------+ 1286 Table 11: 5.2.6 SDP Offer 1288 +----------------------------------+--------------------------------+ 1289 | SDP Contents | RFC#/Notes | 1290 +----------------------------------+--------------------------------+ 1291 | v=0 | [RFC4566] | 1292 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 1293 | s=- | [RFC4566] | 1294 | t=0 0 | [RFC4566] | 1295 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1296 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 1297 | | gotiation] | 1298 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1299 | 109 | | 1300 | c=IN IP4 98.248.92.77 | [RFC4566] | 1301 | a=mid:audio | [RFC5888] | 1302 | a=msid:ma ta | Identifies RTCMediaStream ID | 1303 | | (ma) and RTCMediaStreamTrack | 1304 | | ID (ta) | 1305 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1306 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1307 | hdrext:ssrc-audio-level | | 1308 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1309 | a=recvonly | [RFC3264] - Receive only audio | 1310 | | stream | 1311 | a=setup:active | [RFC4145] - Bob carries out | 1312 | | DTLS Handshake in parallel | 1313 | a=rtcp-mux | [RFC5761] | 1314 | a=ice-ufrag:c300d85b | [RFC5245] | 1315 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 1316 | 7efbabd9a2 | | 1317 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1318 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | 1319 | : 1f:66:79:a8:07 | | 1320 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1321 | 98.248.92.77 49203 typ host | | 1322 | a=ssrc:9513429804 | [RFC5576] | 1323 | cname:Q/o1HmNWs1aN4Xa5 | | 1324 | a=rtcp-rsize | [RFC5506] | 1325 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1326 | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1327 | 120 | | 1328 | c=IN IP4 98.248.92.77 | [RFC4566] | 1329 | a=mid:video | [RFC5888] | 1330 | a=msid:ma tb | Identifies RTCMediaStream ID | 1331 | | (ma) and RTCMediaStreamTrack | 1332 | | ID (tb) | 1333 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1334 | a=content:slides | [RFC4796] | 1335 | a=recvonly | [RFC3264] - Receive Only | 1336 | | Alice's presentation stream | 1337 | a=setup:active | [RFC4145] - Bob carries out | 1338 | | DTLS Handshake in parallel | 1339 | a=rtcp-mux | [RFC5761] | 1340 | a=ice-ufrag:c300d85b | [RFC5245] | 1341 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 1342 | 7efbabd9a2 | | 1343 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1344 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1345 | 9d:1f:66:79:a8:07 | | 1346 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 1347 | 98.248.92.77 49203 typ host | | 1348 | a=ssrc:1366781083 | [RFC5576] | 1349 | cname:EocUG1f0fcg/yvY7 | | 1350 | a=rtcp-rsize | [RFC5506] | 1351 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1352 +----------------------------------+--------------------------------+ 1354 Table 12: 5.2.6 SDP Answer 1356 5.2.7. Audio, Video Session with BUNDLE Support Unknown 1358 In this example, since Alice is unsure of the Bob's support of the 1359 BUNDLE framework, following 3 step procedures are performed in order 1360 to negotiate and setup a BUNDLE Address for the session 1362 o An SDP Offer, in which the Alice assigns unique addresses to each 1363 "m=" line in the BUNDLE group, and requests the Answerer to select 1364 the Offerer's BUNDLE address. 1366 o An SDP Answer, in which the Bob indicates its support for BUNDLE, 1367 and assigns its own BUNDLE address for the BUNDLED m= lines. 1369 o A subsequent SDP Offer from Alice, which is used to perform BUNDLE 1370 Address Synchronization (BAS). 1372 Once the Offer/Answer exchange completes, both Alice and Bob each end 1373 up using single RTP Session for both the Media Streams. 1375 Two-Way Secure Audio,Video with BUNDLE support unknown 1377 Alice Bob 1378 | | 1379 | | 1380 | Alice offers BUNDLE support with unique address | 1381 | for the audio and video m-line | 1382 | | 1383 | | 1384 | Offer(Audio:Opus Video:VP8) | 1385 |----------------------------------------------------->| 1386 | |Bob 1387 | |supports 1388 | |BUNDLE 1389 | Answer(Audio:Opus Video:VP8) | 1390 |<-----------------------------------------------------| 1391 | | 1392 | |Bob uses 1393 | |identical 1394 | |addresses 1395 | | 1396 | Updated Offer for Bundle Address Synchronization. | 1397 |----------------------------------------------------->| 1398 | | 1399 | | 1400 | Answer (Bob accepts the updated offer) | 1401 |<-----------------------------------------------------| 1402 | | 1403 | | 1404 | 2 Way Call with Audio and Video Multiplexed | 1405 |......................................................| 1406 | | 1408 +----------------------------------+--------------------------------+ 1409 | SDP Contents | RFC#/Notes | 1410 +----------------------------------+--------------------------------+ 1411 | v=0 | [RFC4566] | 1412 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1413 | s=- | [RFC4566] | 1414 | t=0 0 | [RFC4566] | 1415 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1416 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 1417 | | gotiation] Alice supports | 1418 | | grouping of m=lines under | 1419 | | BUNDLE semantics | 1420 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1421 | 109 | | 1422 | c=IN IP4 24.23.204.141 | [RFC4566] | 1423 | a=mid:audio | [RFC5888] Audio m=line part of | 1424 | | BUNDLE group with a unique | 1425 | | port number | 1426 | a=msid:ma ta | Identifies RTCMediaStream ID | 1427 | | (ma) and RTCMediaStreamTrack | 1428 | | ID (ta) | 1429 | a=rtcp-mux | [RFC5761] | 1430 | a=rtcp:54609 IN IP4 | [RFC3605] | 1431 | 24.23.204.141 | | 1432 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1433 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1434 | hdrext:ssrc-audio-level | | 1435 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1436 | a=sendrecv | [RFC3264] | 1437 | a=setup:actpass | [RFC4145] - Alice can perform | 1438 | | DTLS before Answer arrives | 1439 | a=ssrc:11111 | [RFC5576] | 1440 | cname:EocUG1f0fcg/yvY7 | | 1441 | a=ice-ufrag:074c6550 | [RFC5245] | 1442 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1443 | 474af08a068 | | 1444 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1445 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1446 | 9d:1f:66:79:a8:07 | | 1447 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1448 | 192.168.1.4 54609 typ host | | 1449 | a=candidate:0 2 UDP 2122194687 | [RFC5245] | 1450 | 192.168.1.4 54609 typ host | | 1451 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1452 | 24.23.204.141 54609 typ srflx | | 1453 | raddr 192.168.1.4 rport 54609 | | 1454 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 1455 | 24.23.204.141 54609 typ srflx | | 1456 | raddr 192.168.1.4 rport 54609 | | 1457 | a=rtcp-fb:109 nack | [RFC5104] | 1458 | a=rtcp-rsize | [RFC5506] | 1459 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1460 | m=video 62537 UDP/TLS/RTP/SAVPF | [RFC4566] | 1461 | 120 | | 1462 | c=IN IP4 24.23.204.141 | [RFC4566] | 1463 | a=mid:video | [RFC5888] Video m=line part of | 1464 | | the Bundle group with a unique | 1465 | | port number | 1466 | a=msid:ma tb | Identifies RTCMediaStream ID | 1467 | | (ma) and RTCMediaStreamTrack | 1468 | | ID (tb) | 1469 | a=rtcp-mux | [RFC5761] | 1470 | a=rtcp:62537 IN IP4 | [RFC3605] - Port for RTCP data | 1471 | 24.23.204.141 | | 1472 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1473 | a=sendrecv | [RFC3264] | 1474 | a=setup:actpass | [RFC4145] - Alice can perform | 1475 | | DTLS before Answer arrives | 1476 | a=ssrc:22222 | [RFC5576] | 1477 | cname:Q/NWs1ao1HmN4Xa5 | | 1478 | a=ice-ufrag:6550074c | [RFC5245] | 1479 | a=ice-pwd:74af08a068a28a397a4c3f | [RFC5245] | 1480 | 31747d1ee34 | | 1481 | a=fingerprint:sha-1 1f:ef:6d:f7: | [RFC5245] | 1482 | c9:c7:70:9d:1f:66:99:41:49:83: | | 1483 | 4a:97:0e79:a8:07 | | 1484 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1485 | 192.168.1.4 62537 typ host | | 1486 | a=candidate:0 2 2122194687 | [RFC5245] | 1487 | 192.168.1.4 62537 typ host | | 1488 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1489 | 24.23.204.141 62537 typ srflx | | 1490 | raddr 192.168.1.4 rport 62537 | | 1491 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 1492 | 24.23.204.141 62537 typ srflx | | 1493 | raddr 192.168.1.4 rport 62537 | | 1494 | a=rtcp-fb:120 nack | [RFC5104] | 1495 | a=rtcp-fb:120 nack pli | [RFC5104] | 1496 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1497 | a=rtcp-rsize | [RFC5506] | 1498 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1499 +----------------------------------+--------------------------------+ 1501 Table 13: 5.2.7 SDP Offer w/BUNDLE 1503 +----------------------------------+--------------------------------+ 1504 | SDP Contents | RFC#/Notes | 1505 +----------------------------------+--------------------------------+ 1506 | v=0 | [RFC4566] | 1507 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 1508 | s=- | [RFC4566] | 1509 | t=0 0 | [RFC4566] | 1510 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1511 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 1512 | | gotiation] Bob supports BUNDLE | 1513 | | semantics. | 1514 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1515 | 109 | | 1516 | c=IN IP4 98.248.92.77 | [RFC4566] | 1517 | a=msid:ma ta | Identifies RTCMediaStream ID | 1518 | | (ma) and RTCMediaStreamTrack | 1519 | | ID (ta) | 1520 | a=mid:audio | [RFC5888] Audio m=line part of | 1521 | | the BUNDLE group | 1522 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1523 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1524 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1525 | hdrext:ssrc-audio-level | | 1526 | a=sendrecv | [RFC3264] | 1527 | a=setup:active | [RFC4145] - Bob carries out | 1528 | | DTLS Handshake in parallel | 1529 | a=rtcp-fb:109 nack | [RFC5104] | 1530 | a=rtcp-mux | [RFC5761] | 1531 | a=ssrc:33333 | [RFC5576] | 1532 | cname:Q/1HmN4Xa5NWs1ao | | 1533 | a=ice-ufrag:c300d85b | [RFC5245] | 1534 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 1535 | 7efbabd9a2 | | 1536 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1537 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1538 | 9d:1f:66:79:a8:07 | | 1539 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1540 | 192.168.1.7 49203 typ host | | 1541 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1542 | 98.248.92.77 49203 typ srflx | | 1543 | raddr 192.168.1.7 rport 49203 | | 1544 | a=rtcp-rsize | [RFC5506] | 1545 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1546 | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1547 | 120 | | 1548 | c=IN IP4 98.248.92.77 | [RFC4566] | 1549 | a=mid:video | [RFC5888] Video m=line part of | 1550 | | the BUNDLE group with the port | 1551 | | from audio line repeated | 1552 | a=msid:ma tb | Identifies RTCMediaStream ID | 1553 | | (ma) and RTCMediaStreamTrack | 1554 | | ID (tb) | 1555 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1556 | a=sendrecv | [RFC3264] | 1557 | a=setup:active | [RFC4145] - Bob carries out | 1558 | | DTLS Handshake in parallel | 1559 | a=rtcp-mux | [RFC5761] | 1560 | a=ssrc:44444 | [RFC5576] | 1561 | cname:Q/2AqlmN4Xa5NWs | | 1562 | a=ice-ufrag:85bc300d | [RFC5245] | 1563 | a=ice-pwd:bd2de4e9991c325921d5d4 | [RFC5245] | 1564 | 7efbabd9a2 | | 1565 | a=fingerprint:sha-1 41:49:83:4a: | [RFC5245] | 1566 | 99:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1567 | 9d:1f:66:79:a8:07 | | 1568 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1569 | 192.168.1.7 49203 typ host | | 1570 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1571 | 98.248.92.77 49203 typ srflx | | 1572 | raddr 192.168.1.7 rport 49203 | | 1573 | a=rtcp-fb:120 nack | [RFC5104] | 1574 | a=rtcp-fb:120 nack pli | [RFC5104] | 1575 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1576 | a=rtcp-rsize | [RFC5506] | 1577 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1578 +----------------------------------+--------------------------------+ 1580 Table 14: 5.2.7 SDP Answer w/BUNDLE 1582 +----------------------------------+--------------------------------+ 1583 | SDP Contents | RFC#/Notes | 1584 +----------------------------------+--------------------------------+ 1585 | v=0 | [RFC4566] | 1586 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1587 | s=- | [RFC4566] | 1588 | t=0 0 | [RFC4566] | 1589 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1590 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 1591 | | gotiation] | 1592 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1593 | 109 | | 1594 | c=IN IP4 24.23.204.141 | [RFC4566] | 1595 | a=msid:ma ta | Identifies RTCMediaStream ID | 1596 | | (ma) and RTCMediaStreamTrack | 1597 | | ID (ta) | 1598 | a=mid:audio | [RFC5888] - Port number | 1599 | | finalized as Bundle Address. | 1600 | a=rtcp-mux | [RFC5761] | 1601 | a=rtcp:54609 IN IP4 | [RFC3605] | 1602 | 24.23.204.141 | | 1603 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1604 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1605 | hdrext:ssrc-audio-level | | 1606 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1607 | a=sendrecv | [RFC3264] | 1608 | a=setup:actpass | [RFC4145] | 1609 | a=ssrc:11111 | [RFC5576] | 1610 | cname:EocUG1f0fcg/yvY7 | | 1611 | a=ice-ufrag:074c6550 | [RFC5245] | 1612 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1613 | 474af08a068 | | 1614 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1615 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1616 | 9d:1f:66:79:a8:07 | | 1617 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1618 | 192.168.1.4 54609 typ host | | 1619 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1620 | 24.23.204.141 54609 typ srflx | | 1621 | raddr 192.168.1.4 rport 54609 | | 1622 | a=rtcp-fb:109 nack | [RFC5104] | 1623 | a=rtcp-rsize | [RFC5506] | 1624 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1625 | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1626 | 120 | | 1627 | c=IN IP4 24.23.204.141 | [RFC4566] | 1628 | a=msid:ma tb | Identifies RTCMediaStream ID | 1629 | | (ma) and RTCMediaStreamTrack | 1630 | | ID (tb) | 1631 | a=mid:video | [RFC5888] | 1632 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1633 | a=sendrecv | [RFC3264] | 1634 | a=setup:actpass | [RFC4145] | 1635 | a=rtcp-mux | [RFC5761] | 1636 | a=ssrc:22222 | [RFC5576] | 1637 | cname:Q/NWs1ao1HmN4Xa5 | | 1638 | a=ice-ufrag:074c6550 | [RFC5245] | 1639 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1640 | 474af08a068 | | 1641 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1642 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1643 | 9d:1f:66:79:a8:07 | | 1644 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1645 | 192.168.1.4 54609 typ host | | 1646 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1647 | 24.23.204.141 54609 typ srflx | | 1648 | raddr 192.168.1.4 rport 54609 | | 1649 | a=rtcp-fb:120 nack | [RFC5104] | 1650 | a=rtcp-fb:120 nack pli | [RFC5104] | 1651 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1652 | a=rtcp-rsize | [RFC5506] | 1653 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1654 +----------------------------------+--------------------------------+ 1656 Table 15: 5.2.7 SDP Offer for BAS 1658 5.2.8. Audio, Video and Data Session 1660 This example shows SDP for negotiating a session with Audio, Video 1661 and data streams between Alice and Bob with BUNDLE support known. 1663 Audio,Video,Data with BUNDLE support known 1665 Alice Bob 1666 | | 1667 | | 1668 |Alice indicates BUNDLE support with | 1669 |identical address across all the m=lines | 1670 | | 1671 | | 1672 | Offer(Audio:Opus Video:VP8 Data) | 1673 |------------------------------------------->| 1674 | |Bob does 1675 | |the same 1676 | Answer(Audio:Opus,Video:VP8 Data) | 1677 |<-------------------------------------------| 1678 | | 1679 | | 1680 | | 1681 | Two-way Audio,Video, Data multiplexed | 1682 |............................................| 1683 | | 1684 | | 1686 +----------------------------------+--------------------------------+ 1687 | SDP Contents | RFC#/Notes | 1688 +----------------------------------+--------------------------------+ 1689 | v=0 | [RFC4566] | 1690 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1691 | s=- | [RFC4566] | 1692 | t=0 0 | [RFC4566] | 1693 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1694 | a=group:BUNDLE audio video data | [I-D.ietf-mmusic-sdp-bundle-ne | 1695 | | gotiation] | 1696 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1697 | 109 | | 1698 | c=IN IP4 24.23.204.141 | [RFC4566] | 1699 | a=msid:ma ta | Identifies RTCMediaStream ID | 1700 | | (ma) and RTCMediaStreamTrack | 1701 | | ID (ta) | 1702 | a=rtcp:54609 IN IP4 | [RFC3605] | 1703 | 24.23.204.141 | | 1704 | a=mid:audio | [RFC5888] | 1705 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1706 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1707 | hdrext:ssrc-audio-level | | 1708 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1709 | a=sendrecv | [RFC3264] | 1710 | a=setup:actpass | [RFC4145] | 1711 | a=rtcp-mux | [RFC5761] | 1712 | a=ice-ufrag:074c6550 | [RFC5245] | 1713 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1714 | 474af08a068 | | 1715 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1716 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1717 | 9d:1f:66:79:a8:07 | | 1718 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1719 | 192.168.1.4 54609 typ host | | 1720 | a=candidate:0 2 UDP 2122194687 | [RFC5245] | 1721 | 192.168.1.4 64678 typ host | | 1722 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1723 | 24.23.204.141 54609 typ srflx | | 1724 | raddr 192.168.1.4 rport 54609 | | 1725 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 1726 | 24.23.204.141 54609 typ srflx | | 1727 | raddr 192.168.1.4 rport 54609 | | 1728 | a=rtcp-fb:109 nack | [RFC5104] | 1729 | a=ssrc:11111 | [RFC5576] | 1730 | cname:Q/NWs1ao1HmN4Xa5 | | 1731 | a=rtcp-rsize | [RFC5506] | 1732 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1733 | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 1734 | 120 | | 1735 | c=IN IP4 24.23.204.141 | [RFC4566] | 1736 | a=msid:ma tb | Identifies RTCMediaStream ID | 1737 | | (ma) and RTCMediaStreamTrack | 1738 | | ID (tb) | 1739 | a=rtcp:54609 IN IP4 | [RFC3605] | 1740 | 24.23.204.141 | | 1741 | a=mid:video | [RFC5888] | 1742 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1743 | a=sendrecv | [RFC3264] | 1744 | a=setup:actpass | [RFC4145] | 1745 | a=rtcp-mux | [RFC5761] | 1746 | a=ice-ufrag:074c6550 | [RFC5245] | 1747 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1748 | 474af08a068 | | 1749 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1750 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1751 | 9d:1f:66:79:a8:07 | | 1752 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1753 | 192.168.1.4 54609 typ host | | 1754 | a=candidate:0 2 UDP 2122194687 | [RFC5245] | 1755 | 192.168.1.4 54609 typ host | | 1756 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1757 | 24.23.204.141 54609 typ srflx | | 1758 | raddr 192.168.1.4 rport 54609 | | 1759 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 1760 | 24.23.204.141 54609 typ srflx | | 1761 | raddr 192.168.1.4 rport 54609 | | 1762 | a=rtcp-fb:120 nack | [RFC5104] | 1763 | a=rtcp-fb:120 nack pli | [RFC5104] | 1764 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1765 | a=ssrc:22222 | [RFC5576] | 1766 | cname:Q/aoNWs11HmN4Xa5 | | 1767 | a=rtcp-rsize | [RFC5506] | 1768 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1769 | m=application 54609 DTLS/SCTP | [I-D.ietf-rtcweb-data-channel] | 1770 | 5000 | | 1771 | c=IN IP4 24.23.204.141 | [RFC4566] | 1772 | a=mid:data | [RFC5888] | 1773 | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | 1774 | DataChannel | | 1775 | streams=1;label="channel 1"; | | 1776 | subprotocol="chat"; | | 1777 | a=sendrecv | [RFC3264] | 1778 | a=setup:actpass | [RFC4145] | 1779 | a=ice-ufrag:074c6550 | [RFC5245] | 1780 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1781 | 474af08a068 | | 1782 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1783 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1784 | 9d:1f:66:79:a8:07 | | 1785 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1786 | 192.168.1.4 54609 typ host | | 1787 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1788 | 24.23.204.141 54609 typ srflx | | 1789 | raddr 192.168.1.4 rport 54609 | | 1790 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1791 +----------------------------------+--------------------------------+ 1793 Table 16: 5.2.8 SDP Offer 1795 +----------------------------------+--------------------------------+ 1796 | SDP Contents | RFC#/Notes | 1797 +----------------------------------+--------------------------------+ 1798 | v=0 | [RFC4566] | 1799 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 1800 | | Information | 1801 | s=- | [RFC4566] | 1802 | t=0 0 | [RFC4566] | 1803 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1804 | a=group:BUNDLE audio video data | [I-D.ietf-mmusic-sdp-bundle-ne | 1805 | | gotiation] | 1806 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1807 | | Bob's trickle support support | 1808 | | is indicated at the session | 1809 | | level | 1810 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1811 | 109 | | 1812 | c=IN IP4 98.248.92.77 | [RFC4566] | 1813 | a=msid:ma ta | Identifies RTCMediaStream ID | 1814 | | (ma) and RTCMediaStreamTrack | 1815 | | ID (ta) | 1816 | a=mid:audio | [RFC5888] | 1817 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1818 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1819 | hdrext:ssrc-audio-level | | 1820 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1821 | a=sendrecv | [RFC3264] | 1822 | a=setup:active | [RFC4145] | 1823 | a=rtcp-mux | [RFC5761] | 1824 | a=rtcp-fb:109 nack | [RFC5104] | 1825 | a=ice-ufrag:c300d85b | [RFC5245] | 1826 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 1827 | 7efbabd9a2 | | 1828 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1829 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1830 | 9d:1f:66:79:a8:07 | | 1831 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1832 | 192.168.1.7 49203 typ host | | 1833 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1834 | 98.248.92.77 49203 typ srflx | | 1835 | raddr 192.168.1.7 rport 49203 | | 1836 | a=ssrc:33333 | [RFC5576] | 1837 | cname:L/aoNWs11HmN4Xa5 | | 1838 | a=rtcp-rsize | [RFC5506] | 1839 | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 1840 | 120 | | 1841 | c=IN IP4 98.248.92.77 | [RFC4566] | 1842 | a=msid:ma tb | Identifies RTCMediaStream ID | 1843 | | (ma) and RTCMediaStreamTrack | 1844 | | ID (tb) | 1845 | a=mid:video | [RFC5888] | 1846 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1847 | a=sendrecv | [RFC3264] | 1848 | a=setup:active | [RFC4145] | 1849 | a=rtcp-mux | [RFC5761] | 1850 | a=ice-ufrag:c300d85b | [RFC5245] | 1851 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 1852 | 7efbabd9a2 | | 1853 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1854 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1855 | 9d:1f:66:79:a8:07 | | 1856 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1857 | 192.168.1.7 49203 typ host | | 1858 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1859 | 98.248.92.77 49203 typ srflx | | 1860 | raddr 192.168.1.7 rport 49203 | | 1861 | a=rtcp-fb:120 nack | [RFC5104] | 1862 | a=rtcp-fb:120 nack pli | [RFC5104] | 1863 | a=rtcp-fb:120 ccm fir | [RFC5104] | 1864 | a=ssrc:44444 | [RFC5576] | 1865 | cname:EocUG1f0fcg/yvY7 | | 1866 | a=rtcp-rsize | [RFC5506] | 1867 | m=application 49203 DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | 1868 | 5000 | | 1869 | c=IN IP4 98.248.92.771 | [RFC4566] | 1870 | a=mid:data | [RFC5888] | 1871 | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | 1872 | DataChannel | | 1873 | streams=16;label="channel 1"; | | 1874 | subprotocol="chat"; | | 1875 | a=setup:active | [RFC4145] | 1876 | a=sendrecv | [RFC3264] | 1877 | a=ice-ufrag:c300d85b | [RFC5245] | 1878 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 1879 | 7efbabd9a2 | | 1880 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1881 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 1882 | 9d:1f:66:79:a8:07 | | 1883 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1884 | 192.168.1.7 49203 typ host | | 1885 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1886 | 98.248.92.77 49203 typ srflx | | 1887 | raddr 192.168.1.7 rport 49203 | | 1888 +----------------------------------+--------------------------------+ 1890 Table 17: 5.2.8 SDP Answer 1892 5.2.9. Audio, Video Session with BUNDLE Unsupported 1894 This use-case illustrates SDP Offer/Answer exchange where the far-end 1895 (Bob) either doesn't support media bundling or doesn't want to group 1896 m=lines over a single 5-tuple. 1898 On successful Offer/Answer exchange, Alice and Bob each end up using 1899 unique 5-tuple for audio and video media streams respectively. 1901 Two-Way Secure Audio,Video with BUNDLE Unsupported 1903 Alice Bob 1904 | | 1905 | | 1906 | Alice offers BUNDLE support with unique address | 1907 | for the audio and video m-line | 1908 | | 1909 | | 1910 | Offer(Audio:Opus Video:VP8) | 1911 |----------------------------------------------------->| 1912 | |Bob 1913 | |doesn't 1914 | |support 1915 | |BUNDLE 1916 | Answer(Audio:Opus Video:VP8) | 1917 |<-----------------------------------------------------| 1918 | |Bob uses 1919 | |unique 1920 | |addresses 1921 | |across the 1922 | |m=lines 1923 | | 1924 |2Way Call with Audio and Video on different 5-tuples | 1925 |......................................................| 1926 | | 1927 | | 1929 +----------------------------------+--------------------------------+ 1930 | SDP Contents | RFC#/Notes | 1931 +----------------------------------+--------------------------------+ 1932 | v=0 | [RFC4566] | 1933 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 1934 | s=- | [RFC4566] | 1935 | t=0 0 | [RFC4566] | 1936 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 1937 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 1938 | | gotiation] Alice supports | 1939 | | grouping of m=lines under | 1940 | | BUNDLE semantics | 1941 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 1942 | m=audio 55232 UDP/TLS/RTP/SAVPF | [RFC4566] | 1943 | 109 | | 1944 | c=IN IP4 24.23.204.141 | [RFC4566] | 1945 | a=msid:ma ta | Identifies RTCMediaStream ID | 1946 | | (ma) and RTCMediaStreamTrack | 1947 | | ID (ta) | 1948 | a=mid:audio | [RFC5888] Audio m=line part of | 1949 | | BUNDLE group with a unique | 1950 | | port number | 1951 | a=rtcp:55232 IN IP4 | [RFC3605] | 1952 | 24.23.204.141 | | 1953 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 1954 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 1955 | hdrext:ssrc-audio-level | | 1956 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 1957 | a=setup:actpass | [RFC4145] - Alice can perform | 1958 | | DTLS before Answer arrives | 1959 | a=sendrecv | [RFC3264] | 1960 | a=rtcp-mux | [RFC5761] | 1961 | a=rtcp-fb:109 nack | [RFC5104] | 1962 | a=ssrc:11111 | [RFC5576] | 1963 | cname:EocUG1f0fcg/yvY7 | | 1964 | a=ice-ufrag:074c6550 | [RFC5245] | 1965 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 1966 | 474af08a068 | | 1967 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 1968 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | 1969 | : 1f:66:79:a8:07 | | 1970 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 1971 | 192.168.1.4 55232 typ host | | 1972 | a=candidate:0 2 UDP 2122194687 | [RFC5245] | 1973 | 192.168.1.4 55232 typ host | | 1974 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 1975 | 24.23.204.141 55232 typ srflx | | 1976 | raddr 192.168.1.4 rport 55232 | | 1977 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 1978 | 24.23.204.141 55232 typ srflx | | 1979 | raddr 192.168.1.4 rport 55232 | | 1980 | a=rtcp-rsize | [RFC5506] | 1981 | m=video 54332 UDP/TLS/RTP/SAVPF | [RFC4566] | 1982 | 120 | | 1983 | c=IN IP4 24.23.204.141 | [RFC4566] | 1984 | a=msid:ma tb | Identifies RTCMediaStream ID | 1985 | | (ma) and RTCMediaStreamTrack | 1986 | | ID (tb) | 1987 | a=mid:video | [RFC5888] Video m=line part of | 1988 | | the BUNDLE group with a unique | 1989 | | port number | 1990 | a=rtcp:54332 IN IP4 | [RFC3605] | 1991 | 24.23.204.141 | | 1992 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 1993 | a=sendrecv | [RFC3264] | 1994 | a=setup:actpass | [RFC4145] - Alice can perform | 1995 | | DTLS before Answer arrives | 1996 | a=rtcp-mux | [RFC5761] | 1997 | a=ssrc:22222 | [RFC5576] | 1998 | cname:yvY7/EocUG1f0fcg | | 1999 | a=ice-ufrag:7872093 | [RFC5245] | 2000 | a=ice-pwd:ee3474af08a068a28a397a | [RFC5245] | 2001 | 4c3f31747d1 | | 2002 | a=fingerprint:sha-1 6d:f7:c9:c7: | [RFC5245] | 2003 | 70:9d:1f:66:79:a8:07:99:41: | | 2004 | 49:83:4a:97:0e:1f:ef | | 2005 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 2006 | 192.168.1.4 54332 typ host | | 2007 | a=candidate:0 2 2122194687 | [RFC5245] | 2008 | 192.168.1.4 54332 typ host | | 2009 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 2010 | 24.23.204.141 54332 typ srflx | | 2011 | raddr 192.168.1.4 rport 54332 | | 2012 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 2013 | 24.23.204.141 54332 typ srflx | | 2014 | raddr 192.168.1.4 rport 54332 | | 2015 | a=rtcp-fb:120 nack | [RFC5104] | 2016 | a=rtcp-fb:120 nack pli | [RFC5104] | 2017 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2018 | a=rtcp-rsize | [RFC5506] | 2019 +----------------------------------+--------------------------------+ 2021 Table 18: 5.2.9 SDP Offer w/BUNDLE 2023 +---------------------------------------+---------------------------+ 2024 | SDP Contents | RFC#/Notes | 2025 +---------------------------------------+---------------------------+ 2026 | v=0 | [RFC4566] | 2027 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 2028 | s=- | [RFC4566] | 2029 | t=0 0 | [RFC4566] | 2030 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2031 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle- | 2032 | | ice] | 2033 | m=audio 53214 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2034 | c=IN IP4 98.248.92.77 | [RFC4566] | 2035 | a=msid:ma ta | Identifies RTCMediaStream | 2036 | | ID (ma) and | 2037 | | RTCMediaStreamTrack ID | 2038 | | (ta) | 2039 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2040 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opu | 2041 | | s] | 2042 | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | 2043 | :ssrc-audio-level | | 2044 | a=ptime:20 | [I-D.ietf-payload-rtp-opu | 2045 | | s] | 2046 | a=setup:active | [RFC4145] - Bob carries | 2047 | | out DTLS Handshake in | 2048 | | parallel | 2049 | a=sendrecv | [RFC3264] | 2050 | a=rtcp-fb:109 nack | [RFC5104] | 2051 | a=ice-ufrag:c300d85b | [RFC5245] | 2052 | a=ice- | [RFC5245] | 2053 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 2054 | a=fingerprint:sha-1 99:41:49:83:4a:97 | [RFC5245] | 2055 | :0e:1f:ef:6d:f7:c9:c7:70: | | 2056 | 9d:1f:66:79:a8:07 | | 2057 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 2058 | 192.168.1.7 53214 typ host | | 2059 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 2060 | 98.248.92.77 53214 typ srflx raddr | | 2061 | 192.168.1.7 rport 53214 | | 2062 | a=candidate:0 2 UDP 2122194687 | [RFC5245] | 2063 | 192.168.1.7 60065 typ host | | 2064 | a=candidate:1 2 UDP 1685987071 | [RFC5245] | 2065 | 98.248.92.77 60065 typ srflx raddr | | 2066 | 192.168.1.7 rport 60065 | | 2067 | a=rtcp-rsize | [RFC5506] | 2068 | m=video 58679 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 2069 | c=IN IP4 98.248.92.77 | [RFC4566] | 2070 | a=msid:ma tb | Identifies RTCMediaStream | 2071 | | ID (ma) and | 2072 | | RTCMediaStreamTrack ID | 2073 | | (tb) | 2074 | a=rtcp:56507 IN IP4 98.248.92.77 | [RFC3605] | 2075 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 2076 | a=setup:active | [RFC4145] - Bob carries | 2077 | | out DTLS Handshake in | 2078 | | parallel | 2079 | a=sendrecv | [RFC3264] | 2080 | a=ice-ufrag:85bC300 | [RFC5245] | 2081 | a=ice- | [RFC5245] | 2082 | pwd:325921d5d47efbabd9a2de4e99bd291c | | 2083 | a=fingerprint:sha-1 9d:1f:66:79:a8:07 | [RFC5245] | 2084 | :99:41:49:83:4a:97:0e:1f: | | 2085 | ef:6d:f7:c9:c7:70 | | 2086 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 2087 | 192.168.1.7 58679 typ host | | 2088 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 2089 | 98.248.92.77 58679 typ srflx raddr | | 2090 | 192.168.1.7 rport 58679 | | 2091 | a=candidate:0 1 UDP 2122194687 | [RFC5245] | 2092 | 192.168.1.7 56507 typ host | | 2093 | a=candidate:1 1 UDP 1685987071 | [RFC5245] | 2094 | 98.248.92.77 56507 typ srflx raddr | | 2095 | 192.168.1.7 rport 58679 | | 2096 | a=rtcp-fb:120 nack | [RFC5104] | 2097 | a=rtcp-fb:120 nack pli | [RFC5104] | 2098 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2099 | a=rtcp-rsize | [RFC5506] | 2100 +---------------------------------------+---------------------------+ 2102 Table 19: 5.2.9 SDP Answer without BUNDLE 2104 5.2.10. Audio, Video BUNDLED, but Data (Not BUNDLED) 2106 This example show-cases SDP for negotiating a session with Audio, 2107 Video and data streams between Alice and Bob with data stream not 2108 being part of the BUNDLE group. This is shown by assigning unique 2109 port for data media sections. 2111 Audio, Video, with Data (Not in BUNDLE) 2113 Alice Bob 2114 | | 2115 | | 2116 |Alice wants to multiplex audio, video but not data | 2117 | | 2118 | | 2119 | Offer(Audio:Opus Video:VP8, Data(not in BUNDLE)) | 2120 |----------------------------------------------------->| 2121 | | 2122 | | 2123 | Answer(Audio:Opus Video:VP8, Data) | 2124 |<-----------------------------------------------------| 2125 | | 2126 | | 2127 |2 Way Call with Audio, Video Multiplexed except data | 2128 |......................................................| 2129 | | 2131 +----------------------------------+--------------------------------+ 2132 | SDP Contents | RFC#/Notes | 2133 +----------------------------------+--------------------------------+ 2134 | v=0 | [RFC4566] | 2135 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 2136 | s=- | [RFC4566] | 2137 | t=0 0 | [RFC4566] | 2138 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2139 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 2140 | | gotiation] Alice wants to | 2141 | | BUNDLE only audio and video | 2142 | | media. | 2143 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 2144 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 2145 | 109 | | 2146 | c=IN IP4 24.23.204.141 | [RFC4566] | 2147 | a=msid:ma ta | Identifies RTCMediaStream ID | 2148 | | (ma) and RTCMediaStreamTrack | 2149 | | ID (ta) | 2150 | a=rtcp:54609 IN IP4 | [RFC3605] | 2151 | 24.23.204.141 | | 2152 | a=mid:audio | [RFC5888] | 2153 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2154 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2155 | hdrext:ssrc-audio-level | | 2156 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2157 | a=sendrecv | [RFC3264] | 2158 | a=setup:actpass | [RFC4145] | 2159 | a=rtcp-mux | [RFC5761] | 2160 | a=ice-ufrag:074c6550 | [RFC5245] | 2161 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 2162 | 474af08a068 | | 2163 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2164 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2165 | 9d:1f:66:79:a8:07 | | 2166 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2167 | 192.168.1.4 54609 typ host | | 2168 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2169 | 192.168.1.4 54609 typ host | | 2170 | a=rtcp-fb:109 nack | [RFC5104] | 2171 | a=ssrc:11111 | [RFC5576] | 2172 | cname:Q/NWs1ao1HmN4Xa5 | | 2173 | a=rtcp-rsize | [RFC5506] | 2174 | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 2175 | 120 | | 2176 | c=IN IP4 24.23.204.141 | [RFC4566] | 2177 | a=msid:ma tb | Identifies RTCMediaStream ID | 2178 | | (ma) and RTCMediaStreamTrack | 2179 | | ID (tb) | 2180 | a=rtcp:54609 IN IP4 | [RFC3605] | 2181 | 24.23.204.141 | | 2182 | a=mid:video | [RFC5888] | 2183 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 2184 | a=sendrecv | [RFC3264] | 2185 | a=setup:actpass | [RFC4145] | 2186 | a=rtcp-mux | [RFC5761] | 2187 | a=ice-ufrag:074c6550 | [RFC5245] | 2188 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 2189 | 474af08a068 | | 2190 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2191 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2192 | 9d:1f:66:79:a8:07 | | 2193 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2194 | 192.168.1.4 54609 typ host | | 2195 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2196 | 192.168.1.4 54609 typ host | | 2197 | a=rtcp-fb:120 nack | [RFC5104] | 2198 | a=rtcp-fb:120 nack pli | [RFC5104] | 2199 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2200 | a=ssrc:22222 | [RFC5576] | 2201 | cname:Q/aoNWs11HmN4Xa5 | | 2202 | a=rtcp-rsize | [RFC5506] | 2203 | m=application 10000 DTLS/SCTP | [I-D.ietf-rtcweb-data-channel] | 2204 | 5000 | | 2205 | c=IN IP4 24.23.204.141 | [RFC4566] | 2206 | a=mid:data | [RFC5888] | 2207 | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | 2208 | DataChannel | | 2209 | streams=16;label="channel 1"; | | 2210 | subprotocol="chat"; | | 2211 | a=sendrecv | [RFC3264] | 2212 | a=setup:actpass | [RFC4145] | 2213 | a=ice-ufrag:89819013 | [RFC5245] | 2214 | a=ice-pwd:1747d1ee3474af08a068a2 | [RFC5245] | 2215 | 8a397a4c3f3 | | 2216 | a=fingerprint:sha-1 0e:1f:ef:6d: | [RFC5245] | 2217 | f7:c9:c7:70:99:41:49:83:4a:97: | | 2218 | 9d:1f:66:79:a8:07 | | 2219 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2220 | 192.168.1.4 10000 typ host | | 2221 +----------------------------------+--------------------------------+ 2223 Table 20: 5.2.10 SDP Offer 2225 +----------------------------------+--------------------------------+ 2226 | SDP Contents | RFC#/Notes | 2227 +----------------------------------+--------------------------------+ 2228 | v=0 | [RFC4566] | 2229 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 2230 | | Information | 2231 | s=- | [RFC4566] | 2232 | t=0 0 | [RFC4566] | 2233 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2234 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 2235 | | gotiation] | 2236 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 2237 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 2238 | 109 | | 2239 | c=IN IP4 98.248.92.77 | [RFC4566] | 2240 | a=msid:ma ta | Identifies RTCMediaStream ID | 2241 | | (ma) and RTCMediaStreamTrack | 2242 | | ID (ta) | 2243 | a=mid:audio | [RFC5888] | 2244 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2245 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2246 | hdrext:ssrc-audio-level | | 2247 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2248 | a=sendrecv | [RFC3264] | 2249 | a=setup:active | [RFC4145] | 2250 | a=rtcp-mux | [RFC5761] | 2251 | a=rtcp-fb:109 nack | [RFC5104] | 2252 | a=ice-ufrag:c300d85b | [RFC5245] | 2253 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 2254 | 7efbabd9a2 | | 2255 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2256 | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | 2257 | 70:9d:1f:66:79:a8:07 | | 2258 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2259 | 192.168.1.7 49203 typ host | | 2260 | a=ssrc:33333 | [RFC5576] | 2261 | cname:L/aoNWs11HmN4Xa5 | | 2262 | a=rtcp-rsize | [RFC5506] | 2263 | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 2264 | 120 | | 2265 | c=IN IP4 98.248.92.771 | [RFC4566] | 2266 | a=msid:ma tb | Identifies RTCMediaStream ID | 2267 | | (ma) and RTCMediaStreamTrack | 2268 | | ID (tb) | 2269 | a=mid:video | [RFC5888] | 2270 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 2271 | a=sendrecv | [RFC3264] | 2272 | a=setup:active | [RFC4145] | 2273 | a=rtcp-mux | [RFC5761] | 2274 | a=ice-ufrag:c300d85b | [RFC5245] | 2275 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 2276 | 7efbabd9a2 | | 2277 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2278 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2279 | 9d:1f:66:79:a8:07 | | 2280 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2281 | 192.168.1.7 49203 typ host | | 2282 | a=rtcp-fb:120 nack | [RFC5104] | 2283 | a=rtcp-fb:120 nack pli | [RFC5104] | 2284 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2285 | a=ssrc:44444 | [RFC5576] | 2286 | cname:EocUG1f0fcg/yvY7 | | 2287 | a=rtcp-rsize | [RFC5506] | 2288 | m=application 20000 DTLS/SCTP | [I-D.ietf-mmusic-sctp-sdp] | 2289 | 5000 | | 2290 | c=IN IP4 98.248.92.77 | [RFC4566] | 2291 | a=mid:data | [RFC5888] | 2292 | a=sctpmap:5000 webrtc- | [I-D.ietf-mmusic-sctp-sdp] | 2293 | DataChannel | | 2294 | streams=1;label="channel 1"; | | 2295 | subprotocol="chat"; | | 2296 | a=setup:active | [RFC4145] | 2297 | a=sendrecv | [RFC3264] | 2298 | a=ice-ufrag:991Ca2a5e | [RFC5245] | 2299 | a=ice-pwd:921d5d47efbabd9a2de4e9 | [RFC5245] | 2300 | 9bd291c325 | | 2301 | a=fingerprint:sha-1 6d:f7:c9:c7: | [RFC5245] | 2302 | 70:9d:1f:66:79:a8:07:99:41:49: | | 2303 | 83:4a:97:0e:1f:ef | | 2304 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2305 | 192.168.1.7 20000 typ host | | 2306 +----------------------------------+--------------------------------+ 2308 Table 21: 5.2.10 SDP Answer 2310 5.2.11. Audio Only, Add Video to BUNDLE 2312 This example involves 2 Offer/Answer exchanges. First one setting up 2313 Audio-only session followed by an updated Offer/Answer exchange to 2314 add video stream to the ongoing session. Also the newly added video 2315 stream is BUNDLED with the audio stream. 2317 Audio Only , Add Video and BUNDLE 2319 Alice Bob 2320 | | 2321 | | 2322 | Alice indicates support for BUNDLE | 2323 | | 2324 | Offer(Audio:Opus) | 2325 |----------------------------------------------------->| 2326 | |Bob 2327 | |supports 2328 | |BUNDLE 2329 | Answer(Audio:Opus) | 2330 |<-----------------------------------------------------| 2331 | |Alice adds 2332 | |video stream 2333 | Updated Offer(Audio:Opus, Video:VP8) |to BUNDLE 2334 |----------------------------------------------------->| 2335 | | 2336 | |Bob accepts 2337 | Updated Answer(Audio:Opus, Video:VP8) | 2338 |<-----------------------------------------------------| 2339 | | 2340 | 2Way Call with Audio and Video Multiplexed | 2341 |......................................................| 2342 | | 2343 | | 2345 +----------------------------------+--------------------------------+ 2346 | SDP Contents | RFC#/Notes | 2347 +----------------------------------+--------------------------------+ 2348 | v=0 | [RFC4566] | 2349 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 2350 | s=- | [RFC4566] | 2351 | t=0 0 | [RFC4566] | 2352 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2353 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 2354 | | gotiation] Alice wants to | 2355 | | BUNDLE only audio and video | 2356 | | media. | 2357 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 2358 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 2359 | 109 | | 2360 | c=IN IP4 24.23.204.141 | [RFC4566] | 2361 | a=msid:ma ta | Identifies RTCMediaStream ID | 2362 | | (ma) and RTCMediaStreamTrack | 2363 | | ID (ta) | 2364 | a=rtcp:64678 IN IP4 | [RFC3605] | 2365 | 24.23.204.141 | | 2366 | a=mid:audio | [RFC5888] | 2367 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2368 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2369 | hdrext:ssrc-audio-level | | 2370 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2371 | a=sendrecv | [RFC3264] | 2372 | a=setup:actpass | [RFC4145] | 2373 | a=rtcp-mux | [RFC5761] | 2374 | a=ice-ufrag:074c6550 | [RFC5245] | 2375 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 2376 | 474af08a068 | | 2377 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2378 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2379 | 9d:1f:66:79:a8:07 | | 2380 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2381 | 192.168.1.4 54609 typ host | | 2382 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2383 | 24.23.204.141 54609 typ srflx | | 2384 | raddr 192.168.1.4 rport 54609 | | 2385 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2386 | 192.168.1.4 64678 typ host | | 2387 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2388 | 24.23.204.141 64678 typ srflx | | 2389 | raddr 192.168.1.4 rport 64678 | | 2390 | a=rtcp-fb:109 nack | [RFC5104] | 2391 | a=ssrc:11111 | [RFC5576] | 2392 | cname:Q/NWs1ao1HmN4Xa5 | | 2393 | a=rtcp-rsize | [RFC5506] | 2394 +----------------------------------+--------------------------------+ 2396 Table 22: 5.2.11 SDP Offer 2398 +----------------------------------+--------------------------------+ 2399 | SDP Contents | RFC#/Notes | 2400 +----------------------------------+--------------------------------+ 2401 | v=0 | [RFC4566] | 2402 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 2403 | | Information | 2404 | s=- | [RFC4566] | 2405 | t=0 0 | [RFC4566] | 2406 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2407 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 2408 | | gotiation] | 2409 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 2410 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 2411 | 109 | | 2412 | c=IN IP4 98.248.92.77 | [RFC4566] | 2413 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2414 | hdrext:ssrc-audio-level | | 2415 | a=msid:ma ta | Identifies RTCMediaStream ID | 2416 | | (ma) and RTCMediaStreamTrack | 2417 | | ID (ta) | 2418 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2419 | a=mid:audio | [RFC5888] | 2420 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2421 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2422 | a=sendrecv | [RFC3264] | 2423 | a=setup:active | [RFC4145] | 2424 | a=rtcp-mux | [RFC5761] | 2425 | a=rtcp-fb:109 nack | [RFC5104] | 2426 | a=ice-ufrag:c300d85b | [RFC5245] | 2427 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 2428 | 7efbabd9a2 | | 2429 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2430 | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | 2431 | 70:9d:1f:66:79:a8:07 | | 2432 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2433 | 192.168.1.7 49203 typ host | | 2434 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2435 | 98.248.92.77 49203 typ srflx | | 2436 | raddr 192.168.1.7 rport 49203 | | 2437 | a=ssrc:33333 | [RFC5576] | 2438 | cname:L/aoNWs11HmN4Xa5 | | 2439 | a=rtcp-rsize | [RFC5506] | 2440 +----------------------------------+--------------------------------+ 2442 Table 23: 5.2.10 SDP Answer 2444 +----------------------------------+--------------------------------+ 2445 | SDP Contents | RFC#/Notes | 2446 +----------------------------------+--------------------------------+ 2447 | v=1 | Version number incremented | 2448 | | [RFC4566] | 2449 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 2450 | s=- | [RFC4566] | 2451 | t=0 0 | [RFC4566] | 2452 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2453 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 2454 | | gotiation] Alice wants to | 2455 | | BUNDLE only audio and video | 2456 | | media. | 2457 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 2458 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 2459 | 109 | | 2460 | c=IN IP4 24.23.204.141 | [RFC4566] | 2461 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2462 | hdrext:ssrc-audio-level | | 2463 | a=msid:ma ta | Identifies RTCMediaStream ID | 2464 | | (ma) and RTCMediaStreamTrack | 2465 | | ID (ta) | 2466 | a=rtcp:64678 IN IP4 | [RFC3605] | 2467 | 24.23.204.141 | | 2468 | a=mid:audio | [RFC5888] | 2469 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2470 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2471 | a=sendrecv | [RFC3264] | 2472 | a=setup:actpass | [RFC4145] | 2473 | a=rtcp-mux | [RFC5761] | 2474 | a=ice-ufrag:074c6550 | [RFC5245] | 2475 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 2476 | 474af08a068 | | 2477 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2478 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | 2479 | : 1f:66:79:a8:07 | | 2480 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2481 | 192.168.1.4 54609 typ host | | 2482 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2483 | 24.23.204.141 54609 typ srflx | | 2484 | raddr 192.168.1.4 rport 54609 | | 2485 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2486 | 192.168.1.4 64678 typ host | | 2487 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2488 | 24.23.204.141 64678 typ srflx | | 2489 | raddr 192.168.1.4 rport 64678 | | 2490 | a=rtcp-fb:109 nack | [RFC5104] | 2491 | a=ssrc:11111 | [RFC5576] | 2492 | cname:Q/NWs1ao1HmN4Xa5 | | 2493 | a=rtcp-rsize | [RFC5506] | 2494 | m=video 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 2495 | 120 | | 2496 | c=IN IP4 24.23.204.141 | [RFC4566] | 2497 | a=msid:ma tb | Identifies RTCMediaStream ID | 2498 | | (ma) and RTCMediaStreamTrack | 2499 | | ID (tb) | 2500 | a=rtcp:64678 IN IP4 | [RFC3605] | 2501 | 24.23.204.141 | | 2502 | a=mid:video | [RFC5888] | 2503 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 2504 | a=sendrecv | [RFC3264] | 2505 | a=setup:actpass | [RFC4145] | 2506 | a=rtcp-mux | [RFC5761] | 2507 | a=ice-ufrag:074c6550 | [RFC5245] | 2508 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 2509 | 474af08a068 | | 2510 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2511 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2512 | 9d:1f:66:79:a8:07 | | 2513 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2514 | 192.168.1.4 54609 typ host | | 2515 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2516 | 24.23.204.141 54609 typ srflx | | 2517 | raddr 192.168.1.4 rport 54609 | | 2518 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2519 | 192.168.1.4 64678 typ host | | 2520 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2521 | 24.23.204.141 64678 typ srflx | | 2522 | raddr 192.168.1.4 rport 64678 | | 2523 | a=rtcp-fb:120 nack | [RFC5104] | 2524 | a=rtcp-fb:120 nack pli | [RFC5104] | 2525 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2526 | a=ssrc:22222 | [RFC5576] | 2527 | cname:Q/aoNWs11HmN4Xa5 | | 2528 | a=rtcp-rsize | [RFC5506] | 2529 +----------------------------------+--------------------------------+ 2531 Table 24: 5.2.11 SDP Updated Offer 2533 +----------------------------------+--------------------------------+ 2534 | SDP Contents | RFC#/Notes | 2535 +----------------------------------+--------------------------------+ 2536 | v=1 | [RFC4566] Version number | 2537 | | incremented | 2538 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 2539 | | Information | 2540 | s=- | [RFC4566] | 2541 | t=0 0 | [RFC4566] | 2542 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2543 | a=group:BUNDLE audio video | [I-D.ietf-mmusic-sdp-bundle-ne | 2544 | | gotiation] | 2545 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 2546 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 2547 | 109 | | 2548 | c=IN IP4 98.248.92.77 | [RFC4566] | 2549 | a=msid:ma ta | Identifies RTCMediaStream ID | 2550 | | (ma) and RTCMediaStreamTrack | 2551 | | ID (ta) | 2552 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2553 | a=mid:audio | [RFC5888] | 2554 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2555 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2556 | hdrext:ssrc-audio-level | | 2557 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2558 | a=sendrecv | [RFC3264] | 2559 | a=setup:active | [RFC4145] | 2560 | a=rtcp-mux | [RFC5761] | 2561 | a=rtcp-fb:109 nack | [RFC5104] | 2562 | a=ice-ufrag:c300d85b | [RFC5245] | 2563 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 2564 | 7efbabd9a2 | | 2565 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2566 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2567 | 9d:1f:66:79:a8:07 | | 2568 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2569 | 192.168.1.7 49203 typ host | | 2570 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2571 | 98.248.92.77 49203 typ srflx | | 2572 | raddr 192.168.1.7 rport 49203 | | 2573 | a=ssrc:33333 | [RFC5576] | 2574 | cname:L/aoNWs11HmN4Xa5 | | 2575 | a=rtcp-rsize | [RFC5506] | 2576 | m=video 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 2577 | 120 | | 2578 | c=IN IP4 98.248.92.77 | [RFC4566] | 2579 | a=msid:ma tb | Identifies RTCMediaStream ID | 2580 | | (ma) and RTCMediaStreamTrack | 2581 | | ID (tb) | 2582 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2583 | a=mid:video | [RFC5888] | 2584 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload-vp8] | 2585 | a=sendrecv | [RFC3264] | 2586 | a=setup:active | [RFC4145] | 2587 | a=rtcp-mux | [RFC5761] | 2588 | a=ice-ufrag:c300d85b | [RFC5245] | 2589 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 2590 | 7efbabd9a2 | | 2591 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2592 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2593 | 9d:1f:66:79:a8:07 | | 2594 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2595 | 192.168.1.7 49203 typ host | | 2596 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 2597 | 98.248.92.77 49203 typ srflx | | 2598 | raddr 192.168.1.7 rport 49203 | | 2599 | a=rtcp-fb:120 nack | [RFC5104] | 2600 | a=rtcp-fb:120 nack pli | [RFC5104] | 2601 | a=rtcp-fb:120 ccm fir | [RFC5104] | 2602 | a=ssrc:44444 | [RFC5576] | 2603 | cname:EocUG1f0fcg/yvY7 | | 2604 | a=rtcp-rsize | [RFC5506] | 2605 +----------------------------------+--------------------------------+ 2607 Table 25: 5.2.11 SDP Updated Answer 2609 5.3. MultiResolution, RTX, FEC Examples 2611 This section deals with scenarios related to multi-source, multi- 2612 stream negotiation such as layered coding, simulcast, along with 2613 techniques that deal with providing robustness against transmission 2614 errors such as FEC and RTX. Also to note, mechanisms such as FEC and 2615 RTX could be envisioned in the above basic scenarios as well. 2617 5.3.1. Sendonly Simulcast Session with 2 cameras and 2 encodings per 2618 camera 2620 The SDP below shows Offer/Answer exchange with one audio and two 2621 video sources. Each of the video source can be sent at two different 2622 resolutions. 2624 One video source corresponds to VP8 encoding, while the other 2625 corresponds to H.264 encoding. 2627 bundle-only framework is used along with BUNDLE grouping framework to 2628 enable multiplexing of all the 5 streams (1 audio stream + 4 video 2629 streams) over a single RTP Session. 2631 1 Way Successful Simulcast w/BUNDLE 2633 Alice Bob 2634 | | 2635 | | 2636 | Alice offers 2 sendonly video sources | 2637 | with 2 simulcast encodings per source | 2638 | and bundle-only for video | 2639 | | 2640 | | 2641 | Offer(Audio:Opus,Video1:VP8,Video2:H.264) | 2642 |------------------------------------------------>| 2643 | | 2644 | | 2645 | Answer(Audio:Opus Video1:VP8,Video2:H.264) | 2646 |<------------------------------------------------| 2647 | | 2648 |One-Way 1 Opus, 2 H.264 and 2 VP8 video streams, | 2649 | all multiplexed | 2650 |.................................................| 2651 | | 2652 | | 2654 +-------------------------------------+-----------------------------+ 2655 | SDP Contents | RFC#/Notes | 2656 +-------------------------------------+-----------------------------+ 2657 | v=0 | [RFC4566] | 2658 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 2659 | s=- | [RFC4566] | 2660 | t=0 0 | [RFC4566] | 2661 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2662 | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | 2663 | | -negotiation] Alice | 2664 | | supports grouping of | 2665 | | m=lines under BUNDLE | 2666 | | semantics | 2667 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | 2668 | | e] | 2669 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2670 | c=IN IP4 24.23.204.141 | [RFC4566] | 2671 | a=msid:ma ta | Identifies RTCMediaStream | 2672 | | ID (ma) and | 2673 | | RTCMediaStreamTrack ID (ta) | 2674 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2675 | a=mid:m0 | [RFC5888] | 2676 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2677 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2678 | hdrext:ssrc-audio-level | | 2679 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2680 | a=sendonly | [RFC3264] | 2681 | a=setup:actpass | [RFC4145] | 2682 | a=rtcp-mux | [RFC5761] | 2683 | a=rtcp-fb:109 nack | [RFC5104] | 2684 | a=ssrc:11111 C90alEocUG1f0fcg | [RFC5576] | 2685 | a=ice-ufrag:074c6550 | [RFC5245] | 2686 | a=ice-pwd:a28a397a4c3f31747d1ee3474 | [RFC5245] | 2687 | af08a068 | | 2688 | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | 2689 | 97:0e:1f:ef:6d:f7:c9:c7:70: | | 2690 | 9d:1f:66:79:a8:07 | | 2691 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2692 | 192.168.1.4 54609 typ host | | 2693 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2694 | 24.23.204.141 54609 typ srflx raddr | | 2695 | 192.168.1.4 rport 54609 | | 2696 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2697 | 192.168.1.4 64678 typ host | | 2698 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2699 | 24.23.204.141 64678 typ srflx raddr | | 2700 | 192.168.1.4 rport 64678 | | 2701 | a=rtcp-rsize | [RFC5506] | 2702 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line with | 2703 | | port number set to zero | 2704 | c=IN IP4 24.23.204.141 | [RFC4566] | 2705 | a=msid:ma tb | Identifies RTCMediaStream | 2706 | | ID (ma) and | 2707 | | RTCMediaStreamTrack ID (tb) | 2708 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2709 | a=mid:m1 | [RFC5888] Video m=line part | 2710 | | of BUNDLE group | 2711 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 2712 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 2713 | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Encoding- | 2714 | | 1 Resolution | 2715 | a=fmtp:98 max-fr=30 | [RFC4566] | 2716 | a=imageattr:100 [x=640,y=480] | [RFC6236] | 2717 | | Camera-1,Encoding-2 | 2718 | | Resolution | 2719 | a=fmtp:100 max-fr=15 | [RFC4566] | 2720 | a=simulcast: send 98;100 | [I-D.ietf-mmusic-sdp-simulc | 2721 | | ast] Alice can send 2 | 2722 | | resolutions | 2723 | a=ssrc:12345 | [RFC5576] [RFC7022] | 2724 | cname:axzo1278npDlAzM73 | Camera-1,Encoding-1 SSRC | 2725 | | with Session CNAME | 2726 | a=ssrc:45678 | [RFC5576] [RFC7022] | 2727 | cname:axzo1278npDlAzM73 | Camera-1,Encoding-2 SSRC | 2728 | | with Session CNAME | 2729 | a=sendonly | [RFC3264] - Send only video | 2730 | | stream | 2731 | a=rtcp-mux | [RFC5761] | 2732 | a=bundle-only | [UNIFIED-PLAN] | 2733 | a=rtcp-fb:98 nack | [RFC5104] | 2734 | a=rtcp-fb:98 nack pli | [RFC5104] | 2735 | a=rtcp-fb:98 ccm fir | [RFC5104] | 2736 | a=rtcp-fb:100 nack | [RFC5104] | 2737 | a=rtcp-fb:100 nack pli | [RFC5104] | 2738 | a=rtcp-fb:100 ccm fir | [RFC5104] | 2739 | a=rtcp-rsize | [RFC5506] | 2740 | m=video 0 UDP/TLS/RTP/SAVPF 101 102 | bundle-only video line with | 2741 | | port number set to zero | 2742 | c=IN IP4 24.23.204.141 | [RFC4566] | 2743 | a=msid:ma tc | Identifies RTCMediaStream | 2744 | | ID (ma) and | 2745 | | RTCMediaStreamTrack ID (tc) | 2746 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 2747 | a=mid:m2 | [RFC5888] Video m=line part | 2748 | | of BUNDLE group | 2749 | a=rtpmap:101 H264/90000 | [RFC3984] | 2750 | a=rtpmap:102 H264/90000 | [RFC3984] | 2751 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding- | 2752 | ;packetization-mode=1;max-fr=30 | 1 Resolution | 2753 | a=fmtp:102 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding- | 2754 | ;packetization-mode=1;max-fr=15 | 2 Resolution | 2755 | a=simulcast: send 101;102 | [I-D.ietf-mmusic-sdp-simulc | 2756 | | ast] | 2757 | a=ssrc:67890 | [RFC5576] [RFC7022] | 2758 | cname:axzo1278npDlAzM73 | Camera-2,Encoding-1 SSRC | 2759 | | with Session CNAME | 2760 | a=ssrc:56789 | [RFC5576] [RFC7022] | 2761 | cname:axzo1278npDlAzM73 | Camera-2,Encoding-2 SSRC | 2762 | | with Session CNAME | 2763 | a=sendonly | [RFC3264] - Send only video | 2764 | | stream | 2765 | a=rtcp-mux | [RFC5761] | 2766 | a=bundle-only | [UNIFIED-PLAN] | 2767 | a=rtcp-fb:101 nack | [RFC5104] | 2768 | a=rtcp-fb:101 nack pli | [RFC5104] | 2769 | a=rtcp-fb:101 ccm fir | [RFC5104] | 2770 | a=rtcp-fb:102 nack | [RFC5104] | 2771 | a=rtcp-fb:102 nack pli | [RFC5104] | 2772 | a=rtcp-fb:102 ccm fir | [RFC5104] | 2773 | a=rtcp-rsize | [RFC5506] | 2774 +-------------------------------------+-----------------------------+ 2776 Table 26: 5.3.1 SDP Offer 2778 +-------------------------------------+-----------------------------+ 2779 | SDP Contents | RFC#/Notes | 2780 +-------------------------------------+-----------------------------+ 2781 | v=0 | [RFC4566] | 2782 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 2783 | s=- | [RFC4566] | 2784 | t=0 0 | [RFC4566] | 2785 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2786 | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | 2787 | | -negotiation] Alice | 2788 | | supports grouping of | 2789 | | m=lines under BUNDLE | 2790 | | semantics | 2791 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | 2792 | | e] | 2793 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 2794 | c=IN IP4 98.248.92.77 | [RFC4566] | 2795 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2796 | a=mid:m0 | [RFC5888] | 2797 | a=msid:ma ta | Identifies RTCMediaStream | 2798 | | ID (ma) and | 2799 | | RTCMediaStreamTrack ID (ta) | 2800 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2801 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2802 | hdrext:ssrc-audio-level | | 2803 | a=rtcp-fb:109 nack | [RFC5104] | 2804 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2805 | a=recvonly | [RFC3264] | 2806 | a=setup:active | [RFC4145] | 2807 | a=rtcp-mux | [RFC5761] | 2808 | a=ssrc:22222 | [RFC5576] | 2809 | cname:y8/C90alEocUG1f0fcg | | 2810 | a=ice-ufrag:c300d85b | [RFC5245] | 2811 | a=ice-pwd:de4e99bd291c325921d5d47ef | [RFC5245] | 2812 | babd9a2 | | 2813 | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | 2814 | 97:0e:1f:ef:6d:f7:c9:c7:70: | | 2815 | 9d:1f:66:79:a8:07 | | 2816 | a=candidate:0 2 UDP 2113667327 | [RFC5245] | 2817 | 192.168.1.7 49203 typ host | | 2818 | a=candidate:1 2 UDP 694302207 | [RFC5245] | 2819 | 98.248.92.77 49203 typ srflx raddr | | 2820 | 192.168.1.4 rport 49203 | | 2821 | a=rtcp-rsize | [RFC5506] | 2822 | m=video 49203 UDP/TLS/RTP/SAVPF 98 | BUNDLE accepted with port | 2823 | 100 | repeated from the audio | 2824 | | port | 2825 | c=IN IP4 98.248.92.77 | [RFC4566] | 2826 | a=msid:ma tb | Identifies RTCMediaStream | 2827 | | ID (ma) and | 2828 | | RTCMediaStreamTrack ID (tb) | 2829 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 2830 | a=mid:m1 | [RFC5888] Video m=line part | 2831 | | of BUNDLE group | 2832 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 2833 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 2834 | a=imageattr:98 [x=1280,y=720] | [RFC6236]Camera-1,Encoding- | 2835 | | 1 Resolution | 2836 | a=fmtp:98 max-fr=30 | [RFC4566] | 2837 | a=imageattr:100 [x=640,y=480] | [RFC6236] | 2838 | | Camera-1,Encoding-2 | 2839 | | Resolution | 2840 | a=fmtp:100 max-fr=15 | [RFC4566] | 2841 | a=recvonly | [RFC3264] - receive only | 2842 | | video stream | 2843 | a=simulcast: recv 98;100 | [I-D.ietf-mmusic-sdp-simulc | 2844 | | ast] | 2845 | a=ssrc:54321 | [RFC5576] | 2846 | cname:y8/C90alEocUG1f0fcg | | 2847 | a=ice-ufrag:c300d85b | [RFC5245] | 2848 | a=ice-pwd:de4e99bd291c325921d5d47ef | [RFC5245] | 2849 | babd9a2 | | 2850 | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | 2851 | 97:0e:1f:ef:6d:f7:c9:c7:70:9d: | | 2852 | 1f:66:79:a8:07 | | 2853 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2854 | 192.168.1.7 60065 typ host | | 2855 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2856 | 98.248.92.77 60065 typ srflx raddr | | 2857 | 192.168.1.4 rport 60065 | | 2858 | a=setup:active | [RFC4145] | 2859 | a=rtcp-mux | [RFC5576] | 2860 | a=bundle-only | [UNIFIED-PLAN] | 2861 | a=rtcp-rsize | [RFC5506] | 2862 | m=video 54609 UDP/TLS/RTP/SAVPF 101 | BUNDLE accepted with port | 2863 | 102 | repeated from the audio | 2864 | | port | 2865 | c=IN IP4 98.248.92.77 | [RFC4566] | 2866 | a=rtcp:56503 IN IP4 98.248.92.77 | [RFC3605] | 2867 | a=msid:ma tc | Identifies RTCMediaStream | 2868 | | ID (ma) and | 2869 | | RTCMediaStreamTrack ID (tc) | 2870 | a=mid:m2 | [RFC5888] Video m=line part | 2871 | | of BUNDLE group | 2872 | a=rtpmap:101 H264/90000 | [RFC3984] | 2873 | a=rtpmap:102 H264/90000 | [RFC3984] | 2874 | a=recvonly | [RFC3264] | 2875 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984] | 2876 | ;packetization-mode=1;max-fr=30 | | 2877 | a=fmtp:102 profile-level-id=4d0028 | [RFC3984] | 2878 | ;packetization-mode=1;max-fr=15 | | 2879 | a=simulcast: recv 101;102 | [I-D.ietf-mmusic-sdp-simulc | 2880 | | ast] Bob accepts to | 2881 | | receieve the offered | 2882 | | simulcast streams | 2883 | a=ssrc:90876 | [RFC5576] | 2884 | cname:axzo1278npDlAzM73 | | 2885 | a=ice-ufrag:ufrag:c300d85b | [RFC5245] | 2886 | a=ice-pwd:de4e99bd291c325921d5d47ef | [RFC5245] | 2887 | babd9a2 | | 2888 | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | 2889 | 97:0e:1f:ef:6d:f7:c9:c7:70: | | 2890 | 9d:1f:66:79:a8:07 | | 2891 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2892 | 192.168.1.7 60065 typ host | | 2893 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2894 | 98.248.92.77 60065 typ srflx raddr | | 2895 | 192.168.1.7 rport 60065 | | 2896 | a=setup:active | [RFC4145] | 2897 | a=rtcp-mux | [RFC5576] | 2898 | a=bundle-only | [UNIFIED-PLAN] | 2899 | a=rtcp-rsize | [RFC5506] | 2900 +-------------------------------------+-----------------------------+ 2902 Table 27: 5.3.1 SDP Anwer 2904 5.3.2. Successful SVC Video Session 2906 This section shows an SDP Offer/Answer for a session with an audio 2907 and a single video source. The video source is encoded as layered 2908 coding at 3 different resolutions based on [RFC5583]. The video 2909 m=line shows 3 streams with last stream (payload 100) dependent on 2910 streams with payload 96 and 97 for decoding. 2912 SVC Session - 3 Layers w/BUNDLE 2914 Alice Bob 2915 | | 2916 | | 2917 | Alice offers 3 sendonly video streams | 2918 | as 3 layers of SVC and bundle-only | 2919 | for video streams. | 2920 | | 2921 | Offer(Video:H.264 SVC) | 2922 |------------------------------------------------>| 2923 | | 2924 | |Bob accepts Alice's 2925 | |offered Codec 2926 | |operation points 2927 | | 2928 | Answer(Video:H.264) | 2929 |<------------------------------------------------| 2930 | | 2931 |One-Way H.264 SVC video streams | 2932 |.................................................| 2933 | | 2934 | | 2936 +----------------------------------+--------------------------------+ 2937 | SDP Contents | RFC#/Notes | 2938 +----------------------------------+--------------------------------+ 2939 | v=0 | [RFC4566] | 2940 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 2941 | s=- | [RFC4566] | 2942 | t=0 0 | [RFC4566] | 2943 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 2944 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 2945 | | gotiation] Alice supports | 2946 | | grouping of m=lines under | 2947 | | BUNDLE semantics | 2948 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 2949 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 2950 | 109 | | 2951 | c=IN IP4 24.23.204.141 | [RFC4566] | 2952 | a=msid:ma ta | Identifies RTCMediaStream ID | 2953 | | (ma) and RTCMediaStreamTrack | 2954 | | ID (ta) | 2955 | a=rtcp:64678 IN IP4 | [RFC3605] | 2956 | 24.23.204.141 | | 2957 | a=mid:m0 | [RFC5888] Audio m=line part of | 2958 | | BUNDLE group with a unique | 2959 | | port number | 2960 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 2961 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 2962 | hdrext:ssrc-audio-level | | 2963 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 2964 | a=sendonly | [RFC3264] | 2965 | a=rtcp-fb:109 nack | [RFC5104] | 2966 | a=setup:actpass | [RFC4145] | 2967 | a=rtcp-mux | [RFC5761] | 2968 | a=ice-ufrag:074c6550 | [RFC5245] | 2969 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 2970 | 474af08a068 | | 2971 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 2972 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 2973 | 9d:1f:66:79:a8:07 | | 2974 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 2975 | 192.168.1.4 54609 typ host | | 2976 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 2977 | 24.23.204.141 54609 typ srflx | | 2978 | raddr 192.168.1.4 rport 54609 | | 2979 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 2980 | 192.168.1.4 64678 typ host | | 2981 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 2982 | 24.23.204.141 64678 typ srflx | | 2983 | raddr 192.168.1.4 rport 64678 | | 2984 | a=ssrc:67890 | [RFC5576] | 2985 | cname:axzo1278npDlAzM73 | | 2986 | a=rtcp-rsize | [RFC5506] | 2987 | m=video 0 UDP/TLS/RTP/SAVPF 96 | bundle-only video line with | 2988 | 97 100 | port number set to zero | 2989 | c=IN IP4 24.23.204.141 | [RFC4566] | 2990 | a=msid:ma tb | Identifies RTCMediaStream ID | 2991 | | (ma) and RTCMediaStreamTrack | 2992 | | ID (tc) | 2993 | a=rtcp:64678 IN IP4 | [RFC3605] | 2994 | 24.23.204.141 | | 2995 | a=mid:m1 | [RFC5888] Audio m=line part of | 2996 | | BUNDLE group | 2997 | a=msid:ma tb | | 2998 | a=rtpmap:96 H264/90000 | [RFC3984] | 2999 | a=fmtp:96 profile-level- | [RFC3984]H.264 Layer 1 | 3000 | id=4d0028; packetization-mode=1 | | 3001 | ;max-fr=30;max-fs=8040 | | 3002 | a=rtpmap:97 H264/90000 | [RFC3984] | 3003 | a=fmtp:97 profile-level- | [RFC3984] H.264 Layer 2 | 3004 | id=4d0028;packetization-mode=1; | | 3005 | max-fr=15;max-fs=1200 | | 3006 | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | 3007 | a=fmtp:100 profile-level- | [RFC3984] | 3008 | id=4d0028;packetization-mode=1; | | 3009 | max-fr=30;max-fs=8040 | | 3010 | a=depend:100 lay m1:96,97; | [RFC5583]Layer 3 dependent on | 3011 | | layers 1 and 2 | 3012 | a=sendonly | [RFC3264] - Send only video | 3013 | | stream | 3014 | a=rtcp-mux | [RFC5761] | 3015 | a=bundle-only | [UNIFIED-PLAN] | 3016 | a=ssrc:1732846380 | [RFC5576] | 3017 | cname:axzo1278npDlAzM73 | | 3018 | a=ssrc:1732846381 | [RFC5576] | 3019 | cname:axzo1278npDlAzM73 | | 3020 | a=ssrc:1732846382 | [RFC5576] | 3021 | cname:axzo1278npDlAzM73 | | 3022 | a=rtcp-fb:* nack | [RFC5104] | 3023 | a=rtcp-fb:* nack pli | [RFC5104] | 3024 | a=rtcp-fb:* ccm fir | [RFC5104] | 3025 | a=rtcp-rsize | [RFC5506] | 3026 +----------------------------------+--------------------------------+ 3028 Table 28: 5.3.2 SDP Offer with SVC 3030 +----------------------------------+--------------------------------+ 3031 | SDP Contents | RFC#/Notes | 3032 +----------------------------------+--------------------------------+ 3033 | v=0 | [RFC4566] | 3034 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3035 | s=- | [RFC4566] | 3036 | t=0 0 | [RFC4566] | 3037 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3038 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 3039 | | gotiation] | 3040 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3041 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 3042 | 109 | | 3043 | c=IN IP4 98.248.92.77 | [RFC4566] | 3044 | a=msid:ma ta | Identifies RTCMediaStream ID | 3045 | | (ma) and RTCMediaStreamTrack | 3046 | | ID (ta) | 3047 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3048 | a=mid:m0 | [RFC5888] | 3049 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3050 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3051 | hdrext:ssrc-audio-level | | 3052 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3053 | a=rtcp-fb:109 nack | [RFC5104] | 3054 | a=recvonly | [RFC3264] | 3055 | a=setup:active | [RFC4145] | 3056 | a=rtcp-mux | [RFC5761] | 3057 | a=ice-ufrag:074c6550 | [RFC5245] | 3058 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3059 | 474af08a068 | | 3060 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3061 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3062 | 9d:1f:66:79:a8:07 | | 3063 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3064 | 192.168.1.7 60065 typ host | | 3065 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3066 | 98.248.92.77 60065 typ srflx | | 3067 | raddr 192.168.1.5 rport 60065 | | 3068 | a=rtcp-rsize | [RFC5506] | 3069 | m=video 54609 UDP/TLS/RTP/SAVPF | BUNDLE accepted Bundle address | 3070 | 96 100 | same as audio m=line. | 3071 | c=IN IP4 98.248.92.77 | [RFC4566] | 3072 | a=msid:ma tb | Identifies RTCMediaStream ID | 3073 | | (ma) and RTCMediaStreamTrack | 3074 | | ID (tb) | 3075 | a=rtcp:56503 IN IP4 98.248.92.77 | [RFC3605] | 3076 | a=mid:m1 | [RFC5888] Video m=line part of | 3077 | | BUNDLE group | 3078 | a=rtpmap:96 H264/90000 | [RFC3984] | 3079 | a=fmtp:96 profile-level- | [RFC3984]H.264 Layer 1 | 3080 | id=4d0028;packetization-mode=1; | | 3081 | max-fr=30;max-fs=8040 | | 3082 | a=rtpmap:100 H264-SVC/90000 | [RFC3984] | 3083 | a=fmtp:100 profile-level- | [RFC3984] | 3084 | id=4d0028;packetization-mode=1; | | 3085 | max-fr=30;max-fs=8040 | | 3086 | a=depend:100 lay m1:96; | [RFC5583] Bob chooses 2 Codec | 3087 | | Operation points | 3088 | a=ice-ufrag:074c6550 | [RFC5245] | 3089 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3090 | 474af08a068 | | 3091 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3092 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3093 | 9d:1f:66:79:a8:07 | | 3094 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3095 | 192.168.1.5 64678 typ host | | 3096 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3097 | 24.23.204.142 64678 typ srflx | | 3098 | raddr 192.168.1.5 rport 64678 | | 3099 | a=recvonly | [RFC3264] - Receive only video | 3100 | | stream | 3101 | a=setup:active | [RFC4145] | 3102 | a=rtcp-mux | [RFC5761] | 3103 | a=bundle-only | [UNIFIED-PLAN] | 3104 | a=ssrc:4638117328 | [RFC5576] | 3105 | cname:axzo1278npDlAzM73 | | 3106 | a=rtcp-rsize | [RFC5506] | 3107 +----------------------------------+--------------------------------+ 3109 Table 29: 5.3.2 SDP Answer with SVC 3111 5.3.3. Successful Simulcast Video Session with Retransmission 3113 This section shows an SDP Offer/Answer exchange for a simulcast 3114 scenario with 2 two resolutions and has [RFC4588] style re- 3115 transmission flows. 3117 Simulcast Streams with Retransmission 3119 Alice Bob 3120 | | 3121 | | 3122 |Alice offers single audio and simulcasted video streams | 3123 | | 3124 | | 3125 | Offer(Audio:Opus Video:VP8 with 2 resolutions) | 3126 | & RTX stream | 3127 |-------------------------------------------------------->| 3128 | | 3129 | | 3130 | Answer (Bob accepts Alice's offer) | 3131 |<--------------------------------------------------------| 3132 | | 3133 | | 3134 |One-Way 1 Opus, 2 VP8 and RTX video streams,all muxed | 3135 |.........................................................| 3136 | | 3137 | | 3139 +----------------------------------+--------------------------------+ 3140 | SDP Contents | RFC#/Notes | 3141 +----------------------------------+--------------------------------+ 3142 | v=0 | [RFC4566] | 3143 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3144 | s=- | [RFC4566] | 3145 | t=0 0 | [RFC4566] | 3146 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3147 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 3148 | | gotiation] Alice supports | 3149 | | grouping of m=lines under | 3150 | | BUNDLE semantics | 3151 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3152 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 3153 | 109 | | 3154 | c=IN IP4 24.23.204.141 | [RFC4566] | 3155 | a=msid:ma ta | Identifies RTCMediaStream ID | 3156 | | (ma) and RTCMediaStreamTrack | 3157 | | ID (ta) | 3158 | a=rtcp:64678 IN IP4 | [RFC3605] | 3159 | 24.23.204.141 | | 3160 | a=mid:m0 | [RFC5888] Audio m=line part of | 3161 | | BUNDLE group with a unique | 3162 | | port number | 3163 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3164 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3165 | hdrext:ssrc-audio-level | | 3166 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3167 | a=rtcp-fb:109 nack | [RFC5104] | 3168 | a=sendonly | [RFC3264] | 3169 | a=setup:actpass | [RFC4145] | 3170 | a=rtcp-mux | [RFC5761] | 3171 | a=ssrc:11111 | [RFC5576] | 3172 | cname:EocUG1f0fcg/yvY7 | | 3173 | a=ice-ufrag:074c6550 | [RFC5245] | 3174 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3175 | 474af08a068 | | 3176 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3177 | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | 3178 | 70:9d:1f:66:79:a8:07 | | 3179 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3180 | 192.168.1.4 54609 typ host | | 3181 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3182 | 24.23.204.141 54609 typ srflx | | 3183 | raddr 192.168.1.4 rport 54609 | | 3184 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3185 | 192.168.1.4 64678 typ host | | 3186 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3187 | 24.23.204.141 64678 typ srflx | | 3188 | raddr 192.168.1.4 rport 64678 | | 3189 | a=rtcp-rsize | [RFC5506] | 3190 | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | 3191 | 100 101 103 | port number set to zero | 3192 | c=IN IP4 24.23.204.141 | [RFC4566] | 3193 | a=msid:ma tb | Identifies RTCMediaStream ID | 3194 | | (ma) and RTCMediaStreamTrack | 3195 | | ID (tb) | 3196 | a=rtcp:64678 IN IP4 | [RFC3605] | 3197 | 24.23.204.141 | | 3198 | a=mid:m1 | [RFC5888] | 3199 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 3200 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 3201 | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | 3202 | a=rtpmap:103 VP8/90000 | [I-D.ietf-payload-vp8] | 3203 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3204 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3205 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3206 | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | 3207 | a=simulast: send 98;100 | [I-D.ietf-mmusic-sdp-simulcast | 3208 | | ] | 3209 | a=ssrc-group:FID 12345 34567 | [RFC5888] | 3210 | a=ssrc-group:FID 78990 90887 | [RFC5888] | 3211 | a=ssrc:12345 | [RFC5576] | 3212 | cname:Q/NWs1ao1HmN4Xa5 | | 3213 | a=ssrc:78990 | [RFC5576] | 3214 | cname:Q/NWs1ao1HmN4Xa5 | | 3215 | a=ssrc:34567 | [RFC5576] | 3216 | cname:Q/NWs1ao1HmN4Xa5 | | 3217 | a=ssrc:90887 | [RFC5576] | 3218 | cname:Q/NWs1ao1HmN4Xa5 | | 3219 | a=sendonly | [RFC3264] | 3220 | a=rtcp-mux | [RFC5761] | 3221 | a=bundle-only | [UNIFIED-PLAN] | 3222 | a=rtcp-fb:* nack | [RFC5104] | 3223 | a=rtcp-fb:* nack pli | [RFC5104] | 3224 | a=rtcp-fb:* ccm fir | [RFC5104] | 3225 | a=rtcp-rsize | [RFC5506] | 3226 +----------------------------------+--------------------------------+ 3228 Table 30: 5.3.3 SDP Offer w/Simulcast, RTX 3230 +----------------------------------+--------------------------------+ 3231 | SDP Contents | RFC#/Notes | 3232 +----------------------------------+--------------------------------+ 3233 | v=0 | [RFC4566] | 3234 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3235 | s=- | [RFC4566] | 3236 | t=0 0 | [RFC4566] | 3237 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3238 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 3239 | | gotiation] Alice supports | 3240 | | grouping of m=lines under | 3241 | | BUNDLE semantics | 3242 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3243 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 3244 | 109 | | 3245 | c=IN IP4 98.248.92.77 | [RFC4566] | 3246 | a=msid:ma ta | Identifies RTCMediaStream ID | 3247 | | (ma) and RTCMediaStreamTrack | 3248 | | ID (ta) | 3249 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3250 | a=mid:m0 | [RFC5888] | 3251 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3252 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3253 | hdrext:ssrc-audio-level | | 3254 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3255 | a=rtcp-fb:109 nack | [RFC5104] | 3256 | a=recvonly | [RFC3264] | 3257 | a=setup:active | [RFC4145] | 3258 | a=rtcp-mux | [RFC5761] | 3259 | a=ssrc:33333 | [RFC5576] | 3260 | cname:L/HmN4Xa5NWs1ao1 | | 3261 | a=ice-ufrag:074c6550 | [RFC5245] | 3262 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3263 | 474af08a068 | | 3264 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3265 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3266 | 9d:1f:66:79:a8:07 | | 3267 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3268 | 192.168.1.7 64678 typ host | | 3269 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3270 | 98.248.92.77 64678 typ srflx | | 3271 | raddr 192.168.1.7 rport 60065 | | 3272 | a=rtcp-rsize | [RFC5506] | 3273 | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | 3274 | 98 100 101 103 | address identical to audio | 3275 | | m-line | 3276 | c=IN IP4 98.248.92.77 | [RFC4566] | 3277 | a=msid:ma tb | Identifies RTCMediaStream ID | 3278 | | (ma) and RTCMediaStreamTrack | 3279 | | ID (tb) | 3280 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3281 | a=mid:m1 | [RFC5888] Video m=line part of | 3282 | | BUNDLE group | 3283 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 3284 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 3285 | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | 3286 | a=rtpmap:103 VP8/90000 | [I-D.ietf-payload-vp8] | 3287 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3288 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3289 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3290 | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | 3291 | a=ice-ufrag:074c6550 | [RFC5245] | 3292 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3293 | 474af08a068 | | 3294 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3295 | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | 3296 | 70:9d:1f:66:79:a8:07 | | 3297 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3298 | 192.168.1.7 60065 typ host | | 3299 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3300 | 98.248.92.772 60065 typ srflx | | 3301 | raddr 192.168.1.7 rport 60065 | | 3302 | a=simulcast: recv 98;100 | [I-D.ietf-mmusic-sdp-simulcast | 3303 | | ] | 3304 | a=recvonly | [RFC3264] | 3305 | a=setup:active | [RFC4145] | 3306 | a=rtcp-mux | [RFC5761] | 3307 | a=bundle-only | [UNIFIED-PLAN] | 3308 | a=rtcp-fb:* nack | [RFC5104] | 3309 | a=rtcp-fb:* nack pli | [RFC5104] | 3310 | a=rtcp-fb:* ccm fir | [RFC5104] | 3311 | a=rtcp-rsize | [RFC5506] | 3312 +----------------------------------+--------------------------------+ 3314 Table 31: 5.3.3 SDP Answer w/Simulcast, RTX 3316 5.3.4. Successful 1-way Simulcast Sessio with 2 resolutions and RTX - 3317 One resolution rejected 3319 This section shows an SDP Offer/Answer exchange for a simulcast 3320 scenario with 2 two resolutions. 3322 It also showcases when Bob rejects one of the Simulcast Video Stream 3323 which results in the rejection of the associated repair stream 3324 implicitly. 3326 Simulcast Streams with Retransmission Rejected 3328 Alice Bob 3329 | | 3330 | | 3331 |Alice offers single audio and simulcasted video streams | 3332 | with bundle-only for video | 3333 | | 3334 | | 3335 |Offer(Audio:Opus Video:VP8 with 2 resolutions,RTX Stream)| 3336 |-------------------------------------------------------->| 3337 | | 3338 | |Bob accepts 1 3339 | |simulcast,rtx 3340 | |rejects the 3341 | |other 3342 | Answer(Audio:Opus Video:VP8 with 1 res & RTX Stream) | 3343 |<--------------------------------------------------------| 3344 | | 3345 | | 3346 |1-way audio,video session and its associated RTX stream, | 3347 | all multiplexed | 3348 |.........................................................| 3349 | | 3350 | | 3352 +----------------------------------+--------------------------------+ 3353 | SDP Contents | RFC#/Notes | 3354 +----------------------------------+--------------------------------+ 3355 | v=0 | [RFC4566] | 3356 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3357 | s=- | [RFC4566] | 3358 | t=0 0 | [RFC4566] | 3359 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3360 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 3361 | | gotiation] Alice supports | 3362 | | grouping of m=lines under | 3363 | | BUNDLE semantics | 3364 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3365 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 3366 | 109 | | 3367 | c=IN IP4 24.23.204.141 | [RFC4566] | 3368 | a=msid:ma ta | Identifies RTCMediaStream ID | 3369 | | (ma) and RTCMediaStreamTrack | 3370 | | ID (ta) | 3371 | a=rtcp:64678 IN IP4 | [RFC3605] | 3372 | 24.23.204.141 | | 3373 | a=mid:m0 | [RFC5888] | 3374 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3375 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3376 | hdrext:ssrc-audio-level | | 3377 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3378 | a=rtcp-fb:109 nack | [RFC5104] | 3379 | a=sendonly | [RFC3264] | 3380 | a=setup:actpass | [RFC4145] | 3381 | a=rtcp-mux | [RFC5761] | 3382 | a=ssrc:11111 | [RFC5576] | 3383 | cname:LP/NWs1ao1HmN4Xa5 | | 3384 | a=ice-ufrag:074c6550 | [RFC5245] | 3385 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3386 | 474af08a068 | | 3387 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3388 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3389 | 9d:1f:66:79:a8:07 | | 3390 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3391 | 192.168.1.4 54609 typ host | | 3392 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3393 | 24.23.204.141 54609 typ srflx | | 3394 | raddr 192.168.1.4 rport 54609 | | 3395 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3396 | 192.168.1.4 64678 typ host | | 3397 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3398 | 24.23.204.141 64678 typ srflx | | 3399 | raddr 192.168.1.4 rport 64678 | | 3400 | a=rtcp-rsize | [RFC5506] | 3401 | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | 3402 | 100 101 103 | port number set to zero | 3403 | c=IN IP4 24.23.204.141 | [RFC4566] | 3404 | a=msid:ma tb | Identifies RTCMediaStream ID | 3405 | | (ma) and RTCMediaStreamTrack | 3406 | | ID (tb) | 3407 | a=rtcp:64678 IN IP4 | [RFC3605] | 3408 | 24.23.204.141 | | 3409 | a=mid:m1 | [RFC5888] | 3410 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 3411 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 3412 | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | 3413 | a=rtpmap:103 VP8/90000 | [I-D.ietf-payload-vp8] | 3414 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3415 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3416 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3417 | a=fmtp:103 apt=100;rtx-time=3000 | [RFC4588] | 3418 | a=simulcast: send 98;100 | [I-D.ietf-mmusic-sdp-simulcast | 3419 | | ] | 3420 | a=ssrc-group:FID 12345 34567 | [RFC5888] | 3421 | a=ssrc-group:FID 78990 90887 | [RFC5888] | 3422 | a=ssrc:12345 | [RFC5576] | 3423 | cname:Q/NWs1ao1HmN4Xa5 | | 3424 | a=ssrc:78990 | [RFC5576] | 3425 | cname:Q/NWs1ao1HmN4Xa5 | | 3426 | a=ssrc:34567 | [RFC5576] | 3427 | cname:Q/NWs1ao1HmN4Xa5 | | 3428 | a=ssrc:90887 | [RFC5576] | 3429 | cname:Q/NWs1ao1HmN4Xa5 | | 3430 | a=sendonly | [RFC3264] | 3431 | a=rtcp-mux | [RFC5761] | 3432 | a=bundle-only | [UNIFIED-PLAN] | 3433 | a=rtcp-fb:* nack | [RFC5104] | 3434 | a=rtcp-fb:* nack pli | [RFC5104] | 3435 | a=rtcp-fb:* ccm fir | [RFC5104] | 3436 | a=rtcp-rsize | [RFC5506] | 3437 +----------------------------------+--------------------------------+ 3439 Table 32: 5.3.4 SDP Offer w/Simulcast, RTX 3441 +----------------------------------+--------------------------------+ 3442 | SDP Contents | RFC#/Notes | 3443 +----------------------------------+--------------------------------+ 3444 | v=0 | [RFC4566] | 3445 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3446 | s=- | [RFC4566] | 3447 | t=0 0 | [RFC4566] | 3448 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3449 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 3450 | | gotiation] Alice supports | 3451 | | grouping of m=lines under | 3452 | | BUNDLE semantics | 3453 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3454 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 3455 | 109 | | 3456 | c=IN IP4 98.248.92.77 | [RFC4566] | 3457 | a=msid:ma ta | Identifies RTCMediaStream ID | 3458 | | (ma) and RTCMediaStreamTrack | 3459 | | ID (ta) | 3460 | a=rtcp:49203 IN IP4 98.248.92.77 | [RFC3605] | 3461 | a=mid:m0 | [RFC5888] | 3462 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3463 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3464 | hdrext:ssrc-audio-level | | 3465 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3466 | a=recvonly | [RFC3264] | 3467 | a=setup:active | [RFC4145] | 3468 | a=rtcp-mux | [RFC5761] | 3469 | a=ice-ufrag:074c6550 | [RFC5245] | 3470 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3471 | 474af08a068 | | 3472 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3473 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3474 | 9d:1f:66:79:a8:07 | | 3475 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3476 | 192.168.1.7 60065 typ host | | 3477 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3478 | 98.248.92.77 60065 typ srflx | | 3479 | raddr 192.168.1.7 rport 60065 | | 3480 | a=rtcp-rsize | [RFC5506] | 3481 | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | 3482 | 98 101 | address identical to audio | 3483 | | m-line | 3484 | c=IN IP4 98.248.92.77 | [RFC4566] | 3485 | a=msid:ma tb | Identifies RTCMediaStream ID | 3486 | | (ma) and RTCMediaStreamTrack | 3487 | | ID (tb) | 3488 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3489 | a=mid:m1 | [RFC5888] | 3490 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 3491 | a=rtpmap:101 VP8/90000 | [I-D.ietf-payload-vp8] | 3492 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3493 | a=fmtp:101 apt=98;rtx-time=3000 | [RFC4588] | 3494 | a=ice-ufrag:074c6550 | [RFC5245] | 3495 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3496 | 474af08a068 | | 3497 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3498 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3499 | 9d:1f:66:79:a8:07 | | 3500 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3501 | 192.168.1.7 60065 typ host | | 3502 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3503 | 98.248.92.77 60065 typ srflx | | 3504 | raddr 192.168.1.5 rport 60065 | | 3505 | a=simulcast: recv 98 | [I-D.ietf-mmusic-sdp-simulcast | 3506 | | ] Bob accepts only one | 3507 | | simulcast resolution | 3508 | a=ssrc:54321 | [RFC5576] | 3509 | cname:NWs1ao1HmN4Xa5 | | 3510 | a=recvonly | [RFC3264] | 3511 | a=setup:active | [RFC4145] | 3512 | a=rtcp-mux | [RFC5761] | 3513 | a=bundle-only | [UNIFIED-PLAN] | 3514 | a=rtcp-rsize | [RFC5506] | 3515 +----------------------------------+--------------------------------+ 3516 Table 33: 5.3.4 SDP Answer no Simulcast 3518 5.3.5. Simulcast Video Session with Forward Error Correction 3520 This section shows an SDP Offer/Answer exchange for Simulcast video 3521 stream at two resolutions and and has [RFC5956] style FEC flows. 3523 On completion of the Offer/Answer exchange mechanism we end up one 3524 audio stream, 2 simulcast video streams and 2 associated FEC streams 3525 are sent over a single 5-tuple. 3527 Simulcast Streams with Forward Error Correction 3529 Alice Bob 3530 | | 3531 | | 3532 | | 3533 |Alice offers single audio and simulcasted video streams | 3534 |with bundle-only | 3535 | | 3536 | | 3537 |Offer(Audio:Opus Video:VP8 with 2 resolutions with FEC Streams)| 3538 |-------------------------------------------------------------->| 3539 | | 3540 | |Bob 3541 | |accepts 3542 | |Alice's 3543 | |offer 3544 |Answer(Audio:Opus Video:VP8 with 2 resolutions w/FEC Streams) | 3545 |<--------------------------------------------------------------| 3546 | | 3547 |One-Way Audio,Video session with 4 video streams(Simulcast | 3548 | and FEC) all multiplexed | 3549 |...............................................................| 3550 | | 3551 | | 3552 | | 3554 +----------------------------------+--------------------------------+ 3555 | SDP Contents | RFC#/Notes | 3556 +----------------------------------+--------------------------------+ 3557 | v=0 | [RFC4566] | 3558 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3559 | s=- | [RFC4566] | 3560 | t=0 0 | [RFC4566] | 3561 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3562 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 3563 | | gotiation] Alice supports | 3564 | | grouping of m=lines under | 3565 | | BUNDLE semantics | 3566 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3567 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 3568 | 109 | | 3569 | c=IN IP4 24.23.204.141 | [RFC4566] | 3570 | a=msid:ma ta | Identifies RTCMediaStream ID | 3571 | | (ma) and RTCMediaStreamTrack | 3572 | | ID (ta) | 3573 | a=rtcp:64678 IN IP4 | [RFC3605] | 3574 | 24.23.204.141 | | 3575 | a=mid:m0 | [RFC5888] | 3576 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3577 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3578 | hdrext:ssrc-audio-level | | 3579 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3580 | a=rtcp-fb:109 nack | [RFC5104] | 3581 | a=sendonly | [RFC3264] | 3582 | a=setup:actpass | [RFC4145] | 3583 | a=rtcp-mux | [RFC5761] | 3584 | a=ssrc:11111 | [RFC5576] | 3585 | cname:Q/NWs1ao1HmN4Xa5 | | 3586 | a=ice-ufrag:074c6550 | [RFC5245] | 3587 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3588 | 474af08a068 | | 3589 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3590 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3591 | 9d:1f:66:79:a8:07 | | 3592 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3593 | 192.168.1.4 54609 typ host | | 3594 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3595 | 24.23.204.141 54609 typ srflx | | 3596 | raddr 192.168.1.4 rport 54609 | | 3597 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3598 | 192.168.1.4 64678 typ host | | 3599 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3600 | 24.23.204.141 64678 typ srflx | | 3601 | raddr 192.168.1.4 rport 64678 | | 3602 | a=rtcp-rsize | [RFC5506] | 3603 | m=video 0 UDP/TLS/RTP/SAVPF 98 | bundle-only video line with | 3604 | 100 101 103 | port number set to zero | 3605 | c=IN IP4 24.23.204.141 | [RFC4566] | 3606 | a=msid:ma tb | Identifies RTCMediaStream ID | 3607 | | (ma) and RTCMediaStreamTrack | 3608 | | ID (tb) | 3609 | a=rtcp:64678 IN IP4 | [RFC3605] | 3610 | 24.23.204.141 | | 3611 | a=mid:m1 | [RFC5888] Video m=line part of | 3612 | | BUNDLE group | 3613 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 3614 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 3615 | a=rtpmap:101 1d-interleaved- | [RFC5956] | 3616 | parityfec/90000 | | 3617 | a=rtpmap:103 1d-interleaved- | [RFC5956] | 3618 | parityfec/90000 | | 3619 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3620 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3621 | a=fmtp:101 L=5; D=10; repair- | [RFC5956] | 3622 | window=200000 | | 3623 | a=fmtp:103 L=5; D=10; repair- | [RFC5956] | 3624 | window=200000 | | 3625 | a=simulcast: send 98;100 | [I-D.ietf-mmusic-sdp-simulcast | 3626 | | ] | 3627 | a=depend:98 fec m1:101 | TBD | 3628 | a=depend:100 fec m1:103 | TBD | 3629 | a=ssrc-group:FEC-FR 12345 34567 | [RFC5888] | 3630 | a=ssrc-group:FEC-FR 78990 90887 | [RFC5888] | 3631 | a=ssrc:12345 | [RFC5576] | 3632 | cname:Q/NWs1ao1HmN4Xa5 | | 3633 | a=ssrc:78990 | [RFC5576] | 3634 | cname:Q/NWs1ao1HmN4Xa5 | | 3635 | a=ssrc:34567 | [RFC5576] | 3636 | cname:Q/NWs1ao1HmN4Xa5 | | 3637 | a=ssrc:90887 | [RFC5576] | 3638 | cname:Q/NWs1ao1HmN4Xa5 | | 3639 | a=sendonly | [RFC3264] | 3640 | a=rtcp-mux | [RFC5761] | 3641 | a=bundle-only | [UNIFIED-PLAN] | 3642 | a=rtcp-fb:* nack | [RFC5104] | 3643 | a=rtcp-fb:* nack pli | [RFC5104] | 3644 | a=rtcp-fb:* ccm fir | [RFC5104] | 3645 | a=rtcp-rsize | [RFC5506] | 3646 +----------------------------------+--------------------------------+ 3648 Table 34: 5.3.5 SDP Offer 3650 +----------------------------------+--------------------------------+ 3651 | SDP Contents | RFC#/Notes | 3652 +----------------------------------+--------------------------------+ 3653 | v=0 | [RFC4566] | 3654 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 3655 | s=- | [RFC4566] | 3656 | t=0 0 | [RFC4566] | 3657 | a=msid-semantic:WMS m0 | [I-D.ietf-mmusic-msid] | 3658 | a=group:BUNDLE m0 m1 | [I-D.ietf-mmusic-sdp-bundle-ne | 3659 | | gotiation] | 3660 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3661 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 3662 | 109 | | 3663 | c=IN IP4 98.248.92.77 | [RFC4566] | 3664 | a=msid:ma ta | Identifies RTCMediaStream ID | 3665 | | (ma) and RTCMediaStreamTrack | 3666 | | ID (ta) | 3667 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3668 | a=mid:m0 | [RFC5888] Audio m=line part of | 3669 | | BUNDLE group with a unique | 3670 | | port number | 3671 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3672 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3673 | hdrext:ssrc-audio-level | | 3674 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3675 | a=rtcp-fb:109 nack | [RFC5104] | 3676 | a=recvonly | [RFC3264] | 3677 | a=setup:active | [RFC4145] | 3678 | a=rtcp-mux | [RFC5761] | 3679 | a=ssrc:33333 | [RFC5576] | 3680 | cname:Y9/cZke09JAtpl98 | | 3681 | a=ice-ufrag:074c6550 | [RFC5245] | 3682 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3683 | 474af08a068 | | 3684 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3685 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70:9d | | 3686 | : 1f:66:79:a8:07 | | 3687 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3688 | 192.168.1.7 60065 typ host | | 3689 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3690 | 98.248.92.77 60065 typ srflx | | 3691 | raddr 192.168.1.7 rport 60065 | | 3692 | a=rtcp-rsize | [RFC5506] | 3693 | m=video 49203 UDP/TLS/RTP/SAVPF | BUNDLE accepted with Bundle | 3694 | 98 100 101 103 | Address identical to audio | 3695 | | m=line. | 3696 | c=IN IP4 98.248.92.77 | [RFC4566] | 3697 | a=msid:ma tb | Identifies RTCMediaStream ID | 3698 | | (ma) and RTCMediaStreamTrack | 3699 | | ID (tb) | 3700 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3701 | a=mid:m1 | [RFC5888] Video m=line part of | 3702 | | BUNDLE group | 3703 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 3704 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 3705 | a=rtpmap:101 1d-interleaved- | [RFC5956] | 3706 | parityfec/90000 | | 3707 | a=rtpmap:103 1d-interleaved- | [RFC5956] | 3708 | parityfec/90000 | | 3709 | a=fmtp:98 max-fr=30;max-fs=8040 | [RFC4566] | 3710 | a=fmtp:100 max-fr=15;max-fs=1200 | [RFC4566] | 3711 | a=fmtp:101 L=5; D=10; repair- | [RFC5956] | 3712 | window=200000 | | 3713 | a=fmtp:103 L=5; D=10; repair- | [RFC5956] | 3714 | window=200000 | | 3715 | a=simulcast: recv 98;100 | [I-D.ietf-mmusic-sdp-simulcast | 3716 | | ] | 3717 | a=depend:98 fec m1:101 | TBD | 3718 | a=depend:100 fec m1:103 | TBD | 3719 | a=recvonly | [RFC3264] | 3720 | a=setup:active | [RFC4145] | 3721 | a=rtcp-mux | [RFC5761] | 3722 | a=bundle-only | [UNIFIED-PLAN] | 3723 | a=ice-ufrag:074c6550 | [RFC5245] | 3724 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3725 | 474af08a068 | | 3726 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3727 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3728 | 9d:1f:66:79:a8:07 | | 3729 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3730 | 192.168.1.7 60065 typ host | | 3731 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3732 | 98.248.92.77 60065 typ srflx | | 3733 | raddr 192.168.1.7 rport 60065 | | 3734 | a=rtcp-fb:* nack | [RFC5104] | 3735 | a=rtcp-fb:* nack pli | [RFC5104] | 3736 | a=rtcp-fb:* ccm fir | [RFC5104] | 3737 | a=rtcp-rsize | [RFC5506] | 3738 +----------------------------------+--------------------------------+ 3740 Table 35: 5.3.5 SDP Answer 3742 5.4. Others 3744 The examples in the section provide SDP for a variety of scenarios 3745 related to RTP Header extension, Legacy Interop scenarios and more. 3747 5.4.1. Audio Session - Voice Activity Detection 3749 This example shows Alice indicating the support of the RTP header 3750 extension to include the audio-level of the audio sample carried in 3751 the RTP packet. 3753 2-Way Audio with VAD 3755 Alice Bob 3756 | | 3757 | | 3758 |Alice indicates support for including | 3759 |audio level in RTP header | 3760 | | 3761 | Offer(Audio:Opus,PCMU,PCMA) | 3762 |---------------------------------------->| 3763 | | 3764 | | 3765 | Answer(Audio:Opus,PCMU,PCMA) | 3766 |<----------------------------------------| 3767 | | 3768 | |Bob accepts and 3769 | |indicates his 3770 | |support as well 3771 | | 3772 | Two way Opus Audio | 3773 |.........................................| 3774 | | 3775 |Per packet audio-level is included in the| 3776 |RTP header | 3777 | | 3779 +----------------------------------+--------------------------------+ 3780 | SDP Contents | RFC#/Notes | 3781 +----------------------------------+--------------------------------+ 3782 | v=0 | [RFC4566] | 3783 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 3784 | s=- | [RFC4566] | 3785 | t=0 0 | [RFC4566] | 3786 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3787 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 3788 | | gotiation] | 3789 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3790 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 3791 | 109 0 8 | | 3792 | c=IN IP4 24.23.204.141 | [RFC4566] | 3793 | a=mid:audio | [RFC5888] | 3794 | a=msid:ma ta | Identifies RTCMediaStream ID | 3795 | | (ma) and RTCMediaStreamTrack | 3796 | | ID (ta) | 3797 | a=rtcp:64678 IN IP4 | [RFC3605] | 3798 | 24.23.204.141 | | 3799 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3800 | hdrext:ssrc-audio-level | | 3801 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3802 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3803 | a=rtpmap:0 PCMU/8000 | [RFC3551] | 3804 | a=rtpmap:0 PCMA/8000 | [RFC3551] | 3805 | a=sendrecv | [RFC3264] | 3806 | a=setup:actpass | [RFC4145] | 3807 | a=rtcp-mux | [RFC5761] | 3808 | a=ice-ufrag:074c6550 | [RFC5245] | 3809 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3810 | 474af08a068 | | 3811 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3812 | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | 3813 | 70:9d:1f:66:79:a8:07 | | 3814 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3815 | 192.168.1.4 54609 typ host | | 3816 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3817 | 24.23.204.141 54609 typ srflx | | 3818 | raddr 192.168.1.4 rport 54609 | | 3819 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3820 | 192.168.1.4 64678 typ host | | 3821 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3822 | 24.23.204.141 64678 typ srflx | | 3823 | raddr 192.168.1.4 rport 64678 | | 3824 | a=rtcp-fb:* nack | [RFC5104] | 3825 | a=ssrc:11111 | [RFC5576] | 3826 | cname:QCL/1HmN4Xa5CClapa | | 3827 | a=rtcp-rsize | [RFC5506] | 3828 +----------------------------------+--------------------------------+ 3830 Table 36: 5.4.1 SDP Offer 3832 +----------------------------------+--------------------------------+ 3833 | SDP Contents | RFC#/Notes | 3834 +----------------------------------+--------------------------------+ 3835 | v=0 | [RFC4566] | 3836 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 3837 | | Information | 3838 | s=- | [RFC4566] | 3839 | t=0 0 | [RFC4566] | 3840 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3841 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 3842 | | gotiation] | 3843 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3844 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 3845 | 109 0 98 | | 3846 | c=IN IP4 98.248.92.77 | [RFC4566] | 3847 | a=mid:audio | [RFC5888] | 3848 | a=msid:ma ta | Identifies RTCMediaStream ID | 3849 | | (ma) and RTCMediaStreamTrack | 3850 | | ID (ta) | 3851 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3852 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3853 | hdrext:ssrc-audio-level | | 3854 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] - | 3855 | | Bob accepts only Opus Codec | 3856 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3857 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 3858 | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | 3859 | a=rtcp-fb:* nack | [RFC5104] | 3860 | a=sendrecv | [RFC3264] - Bob can send and | 3861 | | recv audio | 3862 | a=setup:active | [RFC4145] | 3863 | a=rtcp-mux | [RFC5761] - Bob can perform | 3864 | | RTP/RTCP Muxing on port 49203 | 3865 | a=ice-ufrag:c300d85b | [RFC5245] | 3866 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 3867 | 7efbabd9a2 | | 3868 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3869 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3870 | 9d:1f:66:79:a8:07 | | 3871 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3872 | 192.168.1.7 49203 typ host | | 3873 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 3874 | 98.248.92.77 49203 typ srflx | | 3875 | raddr 192.168.1.7 rport 49203 | | 3876 | a=ssrc:1732846380 | [RFC5576] | 3877 | cname:EocUG1f0fcg/yvY7 | | 3878 | a=rtcp-rsize | [RFC5506] | 3879 +----------------------------------+--------------------------------+ 3881 Table 37: 5.4.1 SDP Answer 3883 5.4.2. Audio Conference - Voice Activity Detection 3885 This example shows SDP for RTP header extension that allows RTP-level 3886 mixers in audio conferences to deliver information about the audio 3887 level of individual participants. 3889 Audio Conference with VAD Support 3891 Alice Mixer 3892 | | 3893 |Alice indicates her interest to audio | 3894 |levels for the contributing sources | 3895 | | 3896 |Offer(Audio:Opus,PCMU,PCMA) | 3897 |---------------------------------------->| 3898 | | 3899 | | 3900 |Answer(Audio:Opus,PCMU,PCMA) | 3901 |<----------------------------------------| 3902 | | 3903 | |Mixer indicates 3904 | |it can provide 3905 | |audio-levels 3906 |Two way Opus Audio | 3907 |.........................................| 3908 | | 3909 |Audio-levels per CSRCS is included in the| 3910 |RTP header | 3911 | | 3913 +----------------------------------+--------------------------------+ 3914 | SDP Contents | RFC#/Notes | 3915 +----------------------------------+--------------------------------+ 3916 | v=0 | [RFC4566] | 3917 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 3918 | | Information | 3919 | s=- | [RFC4566] | 3920 | t=0 0 | [RFC4566] | 3921 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3922 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 3923 | | gotiation] | 3924 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3925 | m=audio 54609 UDP/TLS/RTP/SAVPF | [RFC4566] | 3926 | 109 0 8 | | 3927 | c=IN IP4 24.23.204.141 | [RFC4566] | 3928 | a=mid:audio | [RFC5888] | 3929 | a=msid:ma ta | Identifies RTCMediaStream ID | 3930 | | (ma) and RTCMediaStreamTrack | 3931 | | ID (ta) | 3932 | a=rtcp:64678 IN IP4 | [RFC3605] | 3933 | 24.23.204.141 | | 3934 | a=extmap:1/recvonly | [RFC6465] | 3935 | urn:ietf:params:rtp-hdrext:csrc- | | 3936 | audio-level | | 3937 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 3938 | hdrext:ssrc-audio-level | | 3939 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3940 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3941 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 3942 | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | 3943 | a=rtcp-fb:* nack | [RFC5104] | 3944 | a=sendrecv | [RFC3264] - Alice can send and | 3945 | | recv audio | 3946 | a=setup:actpass | [RFC4145] | 3947 | a=rtcp-mux | [RFC5761] | 3948 | a=ice-ufrag:074c6550 | [RFC5245] | 3949 | a=ice-pwd:a28a397a4c3f31747d1ee3 | [RFC5245] | 3950 | 474af08a068 | | 3951 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 3952 | 4a:97:0e:1f:ef:6d:f7:c9:c7:70: | | 3953 | 9d:1f:66:79:a8:07 | | 3954 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 3955 | 192.168.1.4 54609 typ host | | 3956 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 3957 | 24.23.204.141 54609 typ srflx | | 3958 | raddr 192.168.1.4 rport 54609 | | 3959 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 3960 | 192.168.1.4 64678 typ host | | 3961 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 3962 | 24.23.204.141 64678 typ srflx | | 3963 | raddr 192.168.1.4 rport 64678 | | 3964 | a=ssrc:11111 | [RFC5576] | 3965 | cname:QCL/1HmN4Xa5CClapa | | 3966 | a=rtcp-rsize | [RFC5506] | 3967 +----------------------------------+--------------------------------+ 3969 Table 38: 5.4.2 SDP Offer 3971 +----------------------------------+--------------------------------+ 3972 | SDP Contents | RFC#/Notes | 3973 +----------------------------------+--------------------------------+ 3974 | v=0 | [RFC4566] | 3975 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] - Session Origin | 3976 | | Information | 3977 | s=- | [RFC4566] | 3978 | t=0 0 | [RFC4566] | 3979 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 3980 | a=group:BUNDLE audio | [I-D.ietf-mmusic-sdp-bundle-ne | 3981 | | gotiation] | 3982 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ice] | 3983 | m=audio 49203 UDP/TLS/RTP/SAVPF | [RFC4566] | 3984 | 109 0 98 | | 3985 | c=IN IP4 98.248.92.77 | [RFC4566] | 3986 | a=mid:audio | [RFC5888] | 3987 | a=msid:ma ta | Identifies RTCMediaStream ID | 3988 | | (ma) and RTCMediaStreamTrack | 3989 | | ID (ta) | 3990 | a=rtcp:60065 IN IP4 98.248.92.77 | [RFC3605] | 3991 | a=extmap:1/sendonly | [RFC6465] | 3992 | urn:ietf:params:rtp-hdrext:csrc- | | 3993 | audio-level | | 3994 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 3995 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 3996 | a=rtpmap:0 PCMU/8000 | [RFC3551] PCMU Audio Codec | 3997 | a=rtpmap:0 PCMA/8000 | [RFC3551] PCMA Audio Codec | 3998 | a=rtcp-fb:* nack | [RFC5104] | 3999 | a=sendrecv | [RFC3264] | 4000 | a=setup:active | [RFC4145] | 4001 | a=rtcp-mux | [RFC5761] | 4002 | a=ice-ufrag:c300d85b | [RFC5245] | 4003 | a=ice-pwd:de4e99bd291c325921d5d4 | [RFC5245] | 4004 | 7efbabd9a2 | | 4005 | a=fingerprint:sha-1 99:41:49:83: | [RFC5245] | 4006 | 4a:97:0e:1f:ef:6d:f7:c9:c7: | | 4007 | 70:9d:1f:66:79:a8:07 | | 4008 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4009 | 192.168.1.7 49203 typ host | | 4010 | a=candidate:1 1 UDP 1694302207 | [RFC5245] | 4011 | 98.248.92.77 49203 typ srflx | | 4012 | raddr 192.168.1.7 rport 49203 | | 4013 | a=ssrc:2222 cname:HmN4Xa5CC/lapa | [RFC5576] | 4014 | a=rtcp-rsize | [RFC5506] | 4015 +----------------------------------+--------------------------------+ 4017 Table 39: 5.4.2 SDP Answer 4019 5.4.3. Successful legacy Interop Fallaback with bundle-only 4021 In the scenario described below, Alice is a multi-stream capable 4022 WebRTC endpoint while Bob is a legacy VOIP end-point. The SDP Offer/ 4023 Answer exchange demonstrates successful session setup with fallback 4024 to audio only stream negotiated via bundle-only framework between the 4025 end-points. Specifically, 4027 o Offer from Alice describes 2 cameras via 2 video m=lines with both 4028 marked as bundle-only. 4030 o Since Bob doesnot recognize either the BUNDLE mechanism or the 4031 bundle-only attribute, he accepts only the audio stream from 4032 Alice. 4034 Successful 2-Way WebRTC <-> VOIP Interop 4036 Alice Bob 4037 | | 4038 | | 4039 | Alice is a multistream capable WebRTC end-point | 4040 | & Bob is behind a legacy VOIP system | 4041 | | 4042 |Offer(Audio:Opus Video:2 VP8,2 H2.64 Streams) with | 4043 | bundle-only | 4044 |---------------------------------------------------------->| 4045 | Alice marks both the video streams as bundle-only | 4046 | | 4047 | | 4048 | Answer(Audio:Opus) | 4049 |<----------------------------------------------------------| 4050 | |Bob 4051 | |accepts 4052 | |audio 4053 | |stream, 4054 | |since he 4055 | |doesn't 4056 | |recognize 4057 | |bundle-only 4058 | | 4059 | Two way Opus Audio | 4060 |...........................................................| 4061 | | 4062 | | 4064 +-------------------------------------+-----------------------------+ 4065 | SDP Contents | RFC#/Notes | 4066 +-------------------------------------+-----------------------------+ 4067 | v=0 | [RFC4566] | 4068 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 4069 | s=- | [RFC4566] | 4070 | t=0 0 | [RFC4566] | 4071 | a=msid-semantic:WMS ma | [I-D.ietf-mmusic-msid] | 4072 | a=group:BUNDLE m0 m1 m2 | [I-D.ietf-mmusic-sdp-bundle | 4073 | | -negotiation] Alice | 4074 | | supports grouping of | 4075 | | m=lines under BUNDLE | 4076 | | semantics | 4077 | a=ice-options:trickle | [I-D.ietf-mmusic-trickle-ic | 4078 | | e] | 4079 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4080 | c=IN IP4 24.23.204.141 | [RFC4566] | 4081 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 4082 | a=mid:m0 | [RFC5888] Audio m=line part | 4083 | | of BUNDLE group with a | 4084 | | unique port number | 4085 | a=msid:ma ta | Identifies RTCMediaStream | 4086 | | ID (ma) and | 4087 | | RTCMediaStreamTrack ID (ta) | 4088 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp-opus] | 4089 | a=extmap:1 urn:ietf:params:rtp- | [RFC6464] | 4090 | hdrext:ssrc-audio-level | | 4091 | a=ptime:20 | [I-D.ietf-payload-rtp-opus] | 4092 | a=rtcp-fb:109 nack | [RFC5104] | 4093 | a=sendrecv | [RFC3264] | 4094 | a=setup:actpass | [RFC4145] | 4095 | a=rtcp-mux | [RFC5761] | 4096 | a=ice-ufrag:074c6550 | [RFC5245] | 4097 | a=ice-pwd:a28a397a4c3f31747d1ee3474 | [RFC5245] | 4098 | af08a068 | | 4099 | a=fingerprint:sha-1 99:41:49:83:4a: | [RFC5245] | 4100 | 97:0e:1f:ef:6d:f7:c9:c7:70: | | 4101 | 9d:1f:66:79:a8:07 | | 4102 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4103 | 192.168.1.4 54609 typ host | | 4104 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 4105 | 24.23.204.141 54609 typ srflx raddr | | 4106 | 192.168.1.4 rport 54609 | | 4107 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 4108 | 192.168.1.4 64678 typ host | | 4109 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4110 | 24.23.204.141 64678 typ srflx raddr | | 4111 | 192.168.1.4 rport 64678 | | 4112 | a=ssrc:11111 | [RFC5576]E | 4113 | cname:axzo1278npDlAzM73 | | 4114 | a=rtcp-rsize | [RFC5506] | 4115 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | bundle-only video line with | 4116 | | port number set to zero | 4117 | c=IN IP4 24.23.204.141 | [RFC4566] | 4118 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 4119 | a=mid:m1 | [RFC5888] Video m=line part | 4120 | | of BUNDLE group | 4121 | a=msid:ma tb | Identifies RTCMediaStream | 4122 | | ID (ma) and | 4123 | | RTCMediaStreamTrack ID (tb) | 4124 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 4125 | a=imageattr:98 [x=1280,y=720] | [RFC6236] | 4126 | a=fmtp:98 max-fr=30 | [RFC4566] | 4127 | a=ssrc:12345 | [RFC5576] | 4128 | cname:axzo1278npDlAzM73 | | 4129 | a=bundle-only | [UNIFIED-PLAN] | 4130 | a=sendrecv | [RFC3264] | 4131 | a=rtcp-rsize | [RFC5506] | 4132 | m=video 0 UDP/TLS/RTP/SAVPF 101 103 | bundle-only video line with | 4133 | | port number set to zero | 4134 | c=IN IP4 24.23.204.141 | [RFC4566] | 4135 | a=rtcp:64678 IN IP4 24.23.204.141 | [RFC3605] | 4136 | a=mid:m2 | [RFC5888] Video m=line part | 4137 | | of BUNDLE group | 4138 | a=msid:ma tc | Identifies RTCMediaStream | 4139 | | ID (ma) and | 4140 | | RTCMediaStreamTrack ID (tc) | 4141 | a=rtpmap:101 H264/90000 | [RFC3984] | 4142 | a=rtpmap:103 H264/90000 | [RFC3984] | 4143 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Encoding- | 4144 | ;packetization-mode=1;max-fr=30 | 1 Resolution | 4145 | a=ssrc:67890 | [RFC5576] | 4146 | cname:axzo1278npDlAzM73 | | 4147 | a=bundle-only | [UNIFIED-PLAN] | 4148 | a=sendrecv | [RFC3264] | 4149 | a=rtcp-rsize | [RFC5506] | 4150 +-------------------------------------+-----------------------------+ 4152 Table 40: 5.4.3 SDP Simulcast bundle-only 4154 +------------------------------------------+------------------------+ 4155 | SDP Contents | RFC#/Notes | 4156 +------------------------------------------+------------------------+ 4157 | v=0 | [RFC4566] | 4158 | o=- 20519 0 IN IP4 0.0.0.0 | [RFC4566] | 4159 | s=- | [RFC4566] | 4160 | t=0 0 | [RFC4566] | 4161 | m=audio 49203 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4162 | c=IN IP4 24.23.204.141 | [RFC4566] | 4163 | a=rtcp:60065 IN IP4 24.23.204.141 | [RFC3605] | 4164 | a=rtpmap:109 opus/48000/2 | [I-D.ietf-payload-rtp- | 4165 | | opus] | 4166 | a=extmap:1 urn:ietf:params:rtp-hdrext | [RFC6464] | 4167 | :ssrc-audio-level | | 4168 | a=ptime:20 | [I-D.ietf-payload-rtp- | 4169 | | opus] | 4170 | a=rtcp-fb:109 nack | [RFC5104] | 4171 | a=sendrecv | [RFC3264] | 4172 | a=setup:active | [RFC4145] | 4173 | a=ice-ufrag:ufrag:c300d85b | [RFC5245] | 4174 | a=ice- | [RFC5245] | 4175 | pwd:de4e99bd291c325921d5d47efbabd9a2 | | 4176 | a=fingerprint:sha-1 | [RFC5245] | 4177 | 99:41:49:83:4a:97:0e:1f:ef:6d:f7:c9:c7: | | 4178 | 70:9d:1f:66:79:a8:07 | | 4179 | a=candidate:0 1 UDP 2113667327 | [RFC5245] | 4180 | 192.168.1.7 49203 typ host | | 4181 | a=candidate:1 1 UDP 694302207 | [RFC5245] | 4182 | 98.248.92.77 49203 typ srflx raddr | | 4183 | 192.168.1.7 rport 49203 | | 4184 | a=candidate:0 2 UDP 2113667326 | [RFC5245] | 4185 | 192.168.1.7 60065 typ host | | 4186 | a=candidate:1 2 UDP 1694302206 | [RFC5245] | 4187 | 98.248.92.77 60065 typ srflx raddr | | 4188 | 192.168.1.7 rport 60065 | | 4189 | a=rtcp-rsize | [RFC5506] | 4190 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | 4191 | | bundle-only and hence | 4192 | | rejects the video | 4193 | | stream | 4194 | c=IN IP4 98.248.92.77 | [RFC4566] | 4195 | a=rtpmap:98 VP8/90000 | [I-D.ietf-payload-vp8] | 4196 | a=rtpmap:100 VP8/90000 | [I-D.ietf-payload-vp8] | 4197 | a=imageattr:98 [x=1280,y=720] | [RFC6236] | 4198 | a=fmtp:98 max-fr=30 | [RFC4566] | 4199 | m=video 0 UDP/TLS/RTP/SAVPF 98 100 | Bob doesn't recognize | 4200 | | bundle-only and hence | 4201 | | rejects the video | 4202 | | stream | 4203 | c=IN IP4 98.248.92.77 | [RFC4566] | 4204 | a=rtpmap:101 H264/90000 | [RFC3984] | 4205 | a=fmtp:101 profile-level-id=4d0028 | [RFC3984]Camera-2,Enco | 4206 | ;packetization-mode=1;max-fr=30 | ding-1 Resolution | 4207 +------------------------------------------+------------------------+ 4208 Table 41: 5.4.3 SDP Anwer 4210 5.4.4. Legacy Interop with RTP/AVP profile 4212 In this section, we attempt to provide session descriptions 4213 showcasing inter-operability between a WebRTC end-point and a Legacy 4214 VOIP end-point. The ideas included in here are not fully baked into 4215 the standards and might be controversial in nature. The hope here is 4216 to demonstrate a plausible SDP composition to enchance seamless 4217 inter-operability between the aforementioned communication systems. 4219 In the scenario desribed below, Alice is a legacy end-point which 4220 sends [RFC3264] Offer with two sets of media descriptions per media 4221 type. 4223 One set that correponds to [WebRTC] compliant UDP/TLS/RTP/SAVPF 4224 based audio and video descriptions. 4226 Another set with RTP/AVP based audio and video descriptions for 4227 the legacy Interop purposes. 4229 Also to note, Alice includes session level DTLS information and 4230 media level RTCP feedback information as applicable to both the 4231 sets of media descriptions 4233 On the other hand, Bob being a WebRTC end-point, recognizes accepts 4234 the media descriptions with RTP/AVP profile. The security and 4235 feedback requirements for the session are either handled by a 4236 intermediate gateway or with some combination of Alice's capabilities 4237 and the intermediate gateway. 4239 Successful 2-Way WebRTC <-> VOIP Interop 4241 Alice Bob 4242 | | 4243 | | 4244 | Alice is a legacy VOIP End-point & Bob is a WebRTC End-Point | 4245 | | 4246 | | 4247 | | 4248 | Offer(Audio:Opus Video:H.264) | 4249 |-------------------------------------------------------------->| 4250 | | 4251 | | 4252 |Alice includes 2 copies of media descriptions | 4253 |1. WebRTC compliant media description (UDP/TLS/RTP/SAVPF) | 4254 |2. Legacy compliant media description (RTP/AVP) | 4255 | | 4256 | | 4257 | Answer(Audio:Opus, Video:H.264) | 4258 |<--------------------------------------------------------------| 4259 | |Bob 4260 | |accepts 4261 | |"legacy 4262 | |compliant" 4263 | |m=line 4264 | | 4265 | | 4266 | Two way Opus Audio, H.264 Video | 4267 |...............................................................| 4268 | Session also suports RTP/RTCP Mux, RTCP Feedback | 4269 | | 4271 +-----------------------------------------------+-------------------+ 4272 | SDP Contents | RFC#/Notes | 4273 +-----------------------------------------------+-------------------+ 4274 | v=0 | [RFC4566] | 4275 | o=- 20518 0 IN IP4 0.0.0.0 | [RFC4566] | 4276 | s=- | [RFC4566] | 4277 | t=0 0 | [RFC4566] | 4278 | a=ice-ufrag:074c6550 | [RFC5245] | 4279 | a=ice-pwd:a28a397a4c3f31747d1ee3474af08a068 | [RFC5245] | 4280 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:e | [RFC5245] | 4281 | f:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 4282 | a=rtcp-rsize | [RFC5506] | 4283 | m=audio 54609 UDP/TLS/RTP/SAVPF 109 | [RFC4566] | 4284 | c=IN IP4 24.23.204.141 | [RFC4566] | 4285 | a=rtpmap:109 opus/48000 | | 4286 | a=ptime:20 | | 4287 | a=sendrecv | [RFC3264] | 4288 | a=rtcp-mux | [RFC5761] | 4289 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4290 | 54609 typ host | | 4291 | a=candidate:1 1 UDP 694302207 24.23.204.141 | [RFC5245] | 4292 | 54609 typ srflx raddr 192.168.1.4 rport 54609 | | 4293 | a=candidate:0 2 UDP 2113667326 192.168.1.4 | [RFC5245] | 4294 | 64678 typ host | | 4295 | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | 4296 | 64678 typ srflx raddr 192.168.1.4 rport 64678 | | 4297 | a=rtcp-fb:109 nack | [RFC5104] | 4298 | m=video 62537 UDP/TLS/RTP/SAVPF 120 | [RFC4566] | 4299 | c=IN IP4 24.23.204.141 | [RFC4566] | 4300 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload | 4301 | | -vp8] | 4302 | a=sendrecv | [RFC3264] | 4303 | a=rtcp-mux | [RFC5761] | 4304 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4305 | 62537 typ host | | 4306 | a=candidate:1 1 UDP 1694302207 24.23.204.141 | [RFC5245] | 4307 | 62537 typ srflx raddr 192.168.1.4 rport 62537 | | 4308 | a=candidate:0 2 2113667326 192.168.1.4 54721 | [RFC5245] | 4309 | typ host | | 4310 | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | 4311 | 54721 typ srflx raddr 192.168.1.4 rport 54721 | | 4312 | a=rtcp-fb:120 nack pli | [RFC5104] | 4313 | a=rtcp-fb:120 ccm fir | [RFC5104] | 4314 | --------------- | These set of | 4315 | | media | 4316 | | descriptions are | 4317 | | for Legacy Inter- | 4318 | | op purposes | 4319 | m=audio 54732 RTP/AVP 109 | [RFC4566]Alice | 4320 | | includes RTP/AVP | 4321 | | audio stream | 4322 | | description | 4323 | c=IN IP4 24.23.204.141 | [RFC4566] | 4324 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:7 | [RFC5245] | 4325 | f:7d:f9:c9:c7:70:9d:1f:66:79:a8:07 | | 4326 | a=rtpmap:109 opus/48000 | | 4327 | a=ptime:20 | | 4328 | a=sendrecv | [RFC3264] | 4329 | a=rtcp-mux | [RFC5761]Alice | 4330 | | still includes | 4331 | | RTP/RTCP Mux | 4332 | | support | 4333 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4334 | 54732 typ host | | 4335 | a=candidate:1 1 UDP 694302207 24.23.204.141 | [RFC5245] | 4336 | 54732 typ srflx raddr 192.168.1.4 rport 54732 | | 4337 | a=candidate:0 2 UDP 2113667326 192.168.1.4 | [RFC5245] | 4338 | 64678 typ host | | 4339 | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | 4340 | 64678 typ srflx raddr 192.168.1.4 rport 64678 | | 4341 | a=rtcp-fb:109 nack | [RFC5104]She adds | 4342 | | her intent for | 4343 | | NACK RTCP | 4344 | | feedback support | 4345 | m=video 62445 RTP/AVP 120 | [RFC4566]Alice | 4346 | | includes RTP/AVP | 4347 | | video stream | 4348 | | description | 4349 | c=IN IP4 24.23.204.141 | [RFC4566] | 4350 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:e | [RFC5245] | 4351 | f:7d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 4352 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload | 4353 | | -vp8] | 4354 | a=sendrecv | [RFC3264] | 4355 | a=rtcp-mux | [RFC5761]Alice | 4356 | | intends to | 4357 | | perform RTP/RTCP | 4358 | | Mux | 4359 | a=candidate:0 1 UDP 2113667327 192.168.1.4 | [RFC5245] | 4360 | 62445 typ host | | 4361 | a=candidate:1 1 UDP 1694302207 24.23.204.141 | [RFC5245] | 4362 | 62537 typ srflx raddr 192.168.1.4 rport 62445 | | 4363 | a=candidate:0 2 2113667326 192.168.1.4 54721 | [RFC5245] | 4364 | typ host | | 4365 | a=candidate:1 2 UDP 1694302206 24.23.204.141 | [RFC5245] | 4366 | 54721 typ srflx raddr 192.168.1.4 rport 54721 | | 4367 | a=rtcp-fb:120 nack pli | [RFC5104] Alice | 4368 | | indicates support | 4369 | | for Picture loss | 4370 | | Indication and | 4371 | | NACK RTCP | 4372 | | feedback | 4373 | a=rtcp-fb:120 ccm fir | [RFC5104] | 4374 +-----------------------------------------------+-------------------+ 4376 Table 42: 5.4.5 SDP Offer 4378 +-----------------------------------------------+-------------------+ 4379 | SDP Contents | RFC#/Notes | 4380 +-----------------------------------------------+-------------------+ 4381 | v=0 | [RFC4566] | 4382 | o=- 16833 0 IN IP4 0.0.0.0 | [RFC4566] | 4383 | s=- | [RFC4566] | 4384 | t=0 0 | [RFC4566] | 4385 | a=ice-ufrag:c300d85b | [RFC5245] | 4386 | a=ice-pwd:de4e99bd291c325921d5d47efbabd9a2 | [RFC5245] | 4387 | a=fingerprint:sha-1 99:41:49:83:4a:97:0e:1f:e | [RFC5245] | 4388 | f:6d:f7:c9:c7:70:9d:1f:66:79:a8:07 | | 4389 | m=audio 49203 RTP/AVP 109 | [RFC4566] Bob | 4390 | | accepts RTP/AVP | 4391 | | based audio | 4392 | | stream | 4393 | c=IN IP4 98.248.92.77 | [RFC4566] | 4394 | a=rtpmap:109 opus/48000 | | 4395 | a=ptime:20 | | 4396 | a=sendrecv | [RFC3264] | 4397 | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245] | 4398 | 49203 typ host | | 4399 | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245] | 4400 | 49203 typ srflx raddr 192.168.1.7 rport 49203 | | 4401 | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245] | 4402 | 60065 typ host | | 4403 | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245] | 4404 | 60065 typ srflx raddr 192.168.1.7 rport 60065 | | 4405 | m=video 63130 RTP/SAVP 120 | [RFC4566] Bob | 4406 | | accepts RTP/AVP | 4407 | | based video stram | 4408 | c=IN IP4 98.248.92.771 | [RFC4566] | 4409 | a=rtpmap:120 VP8/90000 | [I-D.ietf-payload | 4410 | | -vp8] | 4411 | a=sendrecv | [RFC3264] | 4412 | a=candidate:0 1 UDP 2113667327 192.168.1.7 | [RFC5245] | 4413 | 63130 typ host | | 4414 | a=candidate:1 1 UDP 1694302207 98.248.92.77 | [RFC5245] | 4415 | 63130 typ srflx raddr 192.168.1.7 rport 63130 | | 4416 | a=candidate:0 2 UDP 2113667326 192.168.1.7 | [RFC5245] | 4417 | 56607 typ host | | 4418 | a=candidate:1 2 UDP 1694302206 98.248.92.77 | [RFC5245] | 4419 | 56607 typ srflx raddr 192.168.1.7 rport 56607 | | 4420 +-----------------------------------------------+-------------------+ 4422 Table 43: 5.4.5 SDP Answer 4424 6. IANA Considerations 4426 This document requires no actions from IANA. 4428 7. Acknowledgments 4430 We would like to thanks Justin Uberti, Chris Flo for their detailed 4431 review and inputs. 4433 8. Change Log 4435 [RFC EDITOR NOTE: Please remove this section when publishing] 4437 Changes from draft-nandakumar-rtcweb-sdp-06 and draft-nandakumar- 4438 rtcweb-sdp-07 4440 o Added clarification on Call-Flow diagram usage 4442 o More cleanups 4444 Changes from draft-nandakumar-rtcweb-sdp-05 4446 o Added Ascii chart for all the SDP Eaxamples 4448 o Improved text and updated SDP Examples for Simulcast and FEC 4450 o Fixed MediaStream ID Semantics SDP Errors 4452 Changes from draft-nandakumar-rtcweb-sdp-04 4454 o Interim version of the draft to avert expiry 4456 o Corrected placement of c= line as per RFC4566 4458 o Updated simulcast SDP to reflect draft-westerlund-avtcore-rtp- 4459 simulcast-04 4461 Changes from draft-nandakumar-rtcweb-sdp-03 4463 o Aligned more closely with JSEP version -05 4465 o Added Conventions to help readability 4467 o Add more examples to clarify BUNDLE use-cases 4469 Changes from draft-nandakumar-rtcweb-sdp-02 4471 o Major refactoring was done to group the examples in to categories 4472 o SDP was updated through out to reflect JSEP-04 style of defining 4473 attributes per m=line than at the session level. 4475 o Added 8 new examples. 4477 o Updated references for Trickle, Unified Plan 4479 o Add section to explain the syntax conventions followed in the 4480 examples. 4482 Changes from draft-nandakumar-rtcweb-sdp-01 4484 o Updated references to OPUS RTP Payload Specification. 4486 o Updated BUNDLE examples based on the latest draft-ietf-mmusic-sdp- 4487 bundle-negotiation. 4489 o Added examples for multiple audio and video flows based on Unified 4490 Plan. 4492 o Added new examples for RTX and FEC streams 4494 o Updated Simulcast and SVC examples 4496 Changes from draft-nandakumar-rtcweb-sdp-00 4498 o Fixed editorial comments on the mailing list. 4500 o Updated Data-channel SDP information based on draft-ietf-mmusic- 4501 sctp-sdp. 4503 o Updated BUNDLE examples based on draft-ietf-mmusic-sdp-bundle- 4504 negotiation. 4506 o Added examples for few more BUNDLE variants 4508 o Added new examples for Simulcast and SVC 4510 9. Informative References 4512 [RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model 4513 with Session Description Protocol (SDP)", RFC 3264, June 4514 2002. 4516 [RFC4145] Yon, D. and G. Camarillo, "TCP-Based Media Transport in 4517 the Session Description Protocol (SDP)", RFC 4145, 4518 September 2005. 4520 [RFC4566] Handley, M., Jacobson, V., and C. Perkins, "SDP: Session 4521 Description Protocol", RFC 4566, July 2006. 4523 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 4524 Requirement Levels", BCP 14, RFC 2119, March 1997. 4526 [RFC5245] Rosenberg, J., "Interactive Connectivity Establishment 4527 (ICE): A Protocol for Network Address Translator (NAT) 4528 Traversal for Offer/Answer Protocols", RFC 5245, April 4529 2010. 4531 [RFC5506] Johansson, I. and M. Westerlund, "Support for Reduced-Size 4532 Real-Time Transport Control Protocol (RTCP): Opportunities 4533 and Consequences", RFC 5506, April 2009. 4535 [RFC3551] Schulzrinne, H. and S. Casner, "RTP Profile for Audio and 4536 Video Conferences with Minimal Control", STD 65, RFC 3551, 4537 July 2003. 4539 [RFC3952] Duric, A. and S. Andersen, "Real-time Transport Protocol 4540 (RTP) Payload Format for internet Low Bit Rate Codec 4541 (iLBC) Speech", RFC 3952, December 2004. 4543 [RFC4796] Hautakorpi, J. and G. Camarillo, "The Session Description 4544 Protocol (SDP) Content Attribute", RFC 4796, February 4545 2007. 4547 [RFC5761] Perkins, C. and M. Westerlund, "Multiplexing RTP Data and 4548 Control Packets on a Single Port", RFC 5761, April 2010. 4550 [RFC3556] Casner, S., "Session Description Protocol (SDP) Bandwidth 4551 Modifiers for RTP Control Protocol (RTCP) Bandwidth", RFC 4552 3556, July 2003. 4554 [RFC5104] Wenger, S., Chandra, U., Westerlund, M., and B. Burman, 4555 "Codec Control Messages in the RTP Audio-Visual Profile 4556 with Feedback (AVPF)", RFC 5104, February 2008. 4558 [RFC4588] Rey, J., Leon, D., Miyazaki, A., Varsa, V., and R. 4559 Hakenberg, "RTP Retransmission Payload Format", RFC 4588, 4560 July 2006. 4562 [RFC5956] Begen, A., "Forward Error Correction Grouping Semantics in 4563 the Session Description Protocol", RFC 5956, September 4564 2010. 4566 [RFC5888] Camarillo, G. and H. Schulzrinne, "The Session Description 4567 Protocol (SDP) Grouping Framework", RFC 5888, June 2010. 4569 [RFC6236] Johansson, I. and K. Jung, "Negotiation of Generic Image 4570 Attributes in the Session Description Protocol (SDP)", RFC 4571 6236, May 2011. 4573 [RFC3984] Wenger, S., Hannuksela, M., Stockhammer, T., Westerlund, 4574 M., and D. Singer, "RTP Payload Format for H.264 Video", 4575 RFC 3984, February 2005. 4577 [RFC5583] Schierl, T. and S. Wenger, "Signaling Media Decoding 4578 Dependency in the Session Description Protocol (SDP)", RFC 4579 5583, July 2009. 4581 [RFC5576] Lennox, J., Ott, J., and T. Schierl, "Source-Specific 4582 Media Attributes in the Session Description Protocol 4583 (SDP)", RFC 5576, June 2009. 4585 [RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V. 4586 Jacobson, "RTP: A Transport Protocol for Real-Time 4587 Applications", STD 64, RFC 3550, July 2003. 4589 [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, 4590 A., Peterson, J., Sparks, R., Handley, M., and E. 4591 Schooler, "SIP: Session Initiation Protocol", RFC 3261, 4592 June 2002. 4594 [RFC2326] Schulzrinne, H., Rao, A., and R. Lanphier, "Real Time 4595 Streaming Protocol (RTSP)", RFC 2326, April 1998. 4597 [RFC3605] Huitema, C., "Real Time Control Protocol (RTCP) attribute 4598 in Session Description Protocol (SDP)", RFC 3605, October 4599 2003. 4601 [RFC2833] Schulzrinne, H. and S. Petrack, "RTP Payload for DTMF 4602 Digits, Telephony Tones and Telephony Signals", RFC 2833, 4603 May 2000. 4605 [RFC6464] Lennox, J., Ivov, E., and E. Marocco, "A Real-time 4606 Transport Protocol (RTP) Header Extension for Client-to- 4607 Mixer Audio Level Indication", RFC 6464, December 2011. 4609 [RFC6465] Ivov, E., Marocco, E., and J. Lennox, "A Real-time 4610 Transport Protocol (RTP) Header Extension for Mixer-to- 4611 Client Audio Level Indication", RFC 6465, December 2011. 4613 [RFC7022] Begen, A., Perkins, C., Wing, D., and E. Rescorla, 4614 "Guidelines for Choosing RTP Control Protocol (RTCP) 4615 Canonical Names (CNAMEs)", RFC 7022, September 2013. 4617 [I-D.ietf-mmusic-sdp-bundle-negotiation] 4618 Holmberg, C., Alvestrand, H., and C. Jennings, 4619 "Negotiating Media Multiplexing Using the Session 4620 Description Protocol (SDP)", draft-ietf-mmusic-sdp-bundle- 4621 negotiation-12 (work in progress), October 2014. 4623 [I-D.ietf-mmusic-sdp-simulcast] 4624 Westerlund, M., Nandakumar, S., and M. Zanaty, "Using 4625 Simulcast in SDP and RTP Sessions", draft-ietf-mmusic-sdp- 4626 simulcast-00 (work in progress), January 2015. 4628 [I-D.ietf-payload-rtp-opus] 4629 Spittka, J., Vos, K., and J. Valin, "RTP Payload Format 4630 for Opus Speech and Audio Codec", draft-ietf-payload-rtp- 4631 opus-07 (work in progress), January 2015. 4633 [I-D.ietf-payload-vp8] 4634 Westin, P., Lundin, H., Glover, M., Uberti, J., and F. 4635 Galligan, "RTP Payload Format for VP8 Video", draft-ietf- 4636 payload-vp8-13 (work in progress), October 2014. 4638 [I-D.ietf-rtcweb-jsep] 4639 Uberti, J., Jennings, C., and E. Rescorla, "Javascript 4640 Session Establishment Protocol", draft-ietf-rtcweb-jsep-08 4641 (work in progress), October 2014. 4643 [I-D.ietf-mmusic-trickle-ice] 4644 Ivov, E., Rescorla, E., and J. Uberti, "Trickle ICE: 4645 Incremental Provisioning of Candidates for the Interactive 4646 Connectivity Establishment (ICE) Protocol", draft-ietf- 4647 mmusic-trickle-ice-02 (work in progress), January 2015. 4649 [I-D.ietf-mmusic-msid] 4650 Alvestrand, H., "WebRTC MediaStream Identification in the 4651 Session Description Protocol", draft-ietf-mmusic-msid-07 4652 (work in progress), October 2014. 4654 [I-D.ietf-mmusic-sctp-sdp] 4655 Holmberg, C., Loreto, S., and G. Camarillo, "Stream 4656 Control Transmission Protocol (SCTP)-Based Media Transport 4657 in the Session Description Protocol (SDP)", draft-ietf- 4658 mmusic-sctp-sdp-12 (work in progress), January 2015. 4660 [I-D.ietf-rtcweb-data-channel] 4661 Jesup, R., Loreto, S., and M. Tuexen, "WebRTC Data 4662 Channels", draft-ietf-rtcweb-data-channel-13 (work in 4663 progress), January 2015. 4665 [WebRTC] W3C, "WebRTC 1.0: Real-time Communication Between 4666 Browsers", 4667 , . 4669 [UNIFIED-PLAN] 4670 Roach, A., Uberti, J., and M. Thomson, "A Unified Plan for 4671 Using SDP with Large Numbers of Media Flows", draft-roach- 4672 mmusic-unified-plan (work in progress), July 2013. 4674 Authors' Addresses 4676 Suhas Nandakumar 4677 Cisco 4678 170 West Tasman Drive 4679 San Jose, CA 95134 4680 USA 4682 Email: snandaku@cisco.com 4684 Cullen Jennings 4685 Cisco 4686 170 West Tasman Drive 4687 San Jose, CA 95134 4688 USA 4690 Phone: +1 408 421-9990 4691 Email: fluffy@cisco.com