Current Meeting Report

2.8.17 Session Initiation Proposal Investigation (sipping)

In addition to this official charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at: -- Additional SIPPING Web Page
NOTE: This charter is a snapshot of the 54th IETF Meeting in Yokohama, Japan. It may now be out-of-date.

Last Modifield: 05/29/2002

Brian Rosen <>
Dean Willis <>
R. Mahy <>
Transport Area Director(s):
Scott Bradner <>
A. Mankin <>
Transport Area Advisor:
A. Mankin <>
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Description of Working Group:
The Session Initiation Protocol Project INvestiGation (SIPPING) working group is chartered to document the use of SIP for several applications related to telephony and multimedia, and to develop requirements for any extensions to SIP needed for those applications. Such requirements will be referred to the SIP working group for development of any new SIP method or header. Guiding principles for the performance of SIPPING's work will include:

1. Documenting the requirements of specific chartered tasks.

2. Documenting the usage of SIP to solve real problems that need to be solved in a standardized way.

3. Looking for commonalities among the chartered tasks and other ongoing SIP-related development, as commonalities may indicate need for general, reusable functionality in SIP.

4. Describing the requirements for any extension determined to be needed, and handing them to the SIP WG.

Besides performing needed specification of several applications of SIP, SIPPING can be seen as also working out use cases that clarify the role of SIP in the Internet, and help to ensure that Occam's razor is appropriately applied to SIP usage.

The security of all the deliverables will be of special importance. The technology for security will be keyed from a SIP security specification developed (in progress now) by the SIP Working Group.

The specific tasks for SIPPING will be:

1. PSTN and/or 3G telephony-equivalent applications that need a standardized approach

- informational guide to common call flows

- support for T.38 fax

- requirements from 3GPP for SIP usage

- framework of SIP for telephony (SIP-T)

- call transfer and call forwarding

- AAA application in SIP telephony

- mapping between SIP and ISUP

2. Messaging-like applications of SIP -

- support for hearing-/speech-impaired calling

- development of usage guidelines for subscribe-notify (RFC 2848, SIP events) to ensure commonality among applications using them, including SIMPLE WG's instant messaging.

3. Multi-party applications of SIP

- the working group will review a number of technical pieces including call transfer, subscribe-notify, SIP features negotiation, and session description protocol (SDP) capability negotiation, and will develop requirements and an initial design or framework for multi-party conferencing with SIP.

4. SIP calling to media servers

- the working group will develop a requirements draft for an approach to SIP interaction with media servers. An example is whether a voicemail server is just a box that a caller can send an INVITE to.

At a later time, the working group and chairs may request of the Area Directors that new tasks be added to the charter. Such additions to the charter will require IESG approval.

The group will work very closely with SIP working group. The group will also maintain open dialogue with the IPTEL working group, whose Call Processing Language (CPL) related to the task areas in a number of ways. The group will also coordinate closely with SIMPLE, AAA, and MMUSIC (SDP development).

SIPPING will also ensure compatibility with the work done by the now concluded PINT working group. SIPPING will encourage active participation from the Distributed Call Signaling (DCS) Group of the PacketCable Consortium for distributed telephony services, 3GPP, 3GPP2, and several ITU-T study groups.

Goals and Milestones:
Done  Submit Internet-Draft on SIP-Telephony Framework to IESG for consideration as a BCP
APR 02  Submit Internet-Draft on ISUP-SIP Mapping to IESG for consideration as Proposed Standard
Done  Submit Internet-Draft on Requirements for use of SIP to support telephony for the Hearing-Impaired to IESG for consideration as an Informational RFC
APR 02  Submit Internet-Draft on Call Transfer using REFER to IESG for consideration as a BCP
MAY 02  Submit Internet-Draft on Common Call Flows to IESG for consideration as a BCP
MAY 02  Using ENUM with SIP Applications to IESG for consideration as an Informational RFC
MAY 02  Submit Internet-Draft on Requirements for AAA Application in SIP Telephony to IESG for consideration as an Informational RFC
Done  Submit SIP 3rd party call control to IESG for consideration as BCP
JUN 02  Submit Internet-Draft on Multi-Party/Conferencing Framework to IESG for consideration as an Informational RFC
JUN 02  Submit Internet-Draft on T.38 Fax Call Flows to IESG for consideration as a BCP
JUN 02  Submit Internet-Draft on 3G Requirements to IESG for consideration as an Informational RFC
JUL 02  Submit Internet-Draft on Mapping ISUP Overlap Signaling to SIP to IESG for consideration as a Proposed Standard
AUG 02  Submit Message Waiting SIP event package to IESG for consideration as PS
Done  Submit Internet-Draft on Usage Guideline for Events (Subscribe-Notify) to IESG for consideration as an Informational RFC
OCT 02  Submit Call Info SIP event package to IESG for consideration as PS
OCT 02  Submit Conf Info SIP event package to IESG for consideration as PS
NOV 02  Review charter with Area Directors and recharter or conclude
  • - draft-ietf-sipping-conferencing-models-01.txt
  • - draft-ietf-sipping-isup-03.txt
  • - draft-ietf-sipping-sipt-04.txt
  • - draft-ietf-sipping-e164-01.txt
  • - draft-ietf-sipping-overlap-01.txt
  • - draft-ietf-sipping-deaf-req-03.txt
  • - draft-ietf-sipping-call-flows-00.txt
  • - draft-ietf-sipping-service-examples-02.txt
  • - draft-ietf-sipping-realtimefax-00.txt
  • - draft-ietf-sipping-cc-framework-01.txt
  • - draft-ietf-sipping-3pcc-02.txt
  • - draft-ietf-sipping-nai-reqs-02.txt
  • - draft-ietf-sipping-sigcomp-sip-dictionary-03.txt
  • - draft-ietf-sipping-mwi-00.txt
  • - draft-ietf-sipping-content-indirect-00.txt
  • - draft-ietf-sipping-nat-scenarios-00.txt
  • - draft-ietf-sipping-conference-package-00.txt
  • - draft-ietf-sipping-dialog-package-00.txt
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