The charter of the Multiparty Multimedia Session Control (mmusic) working group in the Transport Area of the IETF has been updated. For additional information, please contact the Area Directors or the working group Chairs. Multiparty Multimedia Session Control (mmusic) ---------------------------------------------- Current Status: Active Working Group Chairs: Joerg Ott <jo@acm.org> Colin Perkins <csp@csperkins.org> Transport Area Directors: Allison Mankin <mankin@psg.com> Jon Peterson <jon.peterson@neustar.biz> Transport Area Advisor: Jon Peterson <jon.peterson@neustar.biz> Mailing Lists: General Discussion: mmusic@ietf.org To Subscribe: mmusic-request@ietf.org In Body: subscribe your_email_address Archive: http://www.ietf.org/mailman/listinfo/mmusic Description of the Working Group The Multiparty MUltimedia SessIon Control (MMUSIC) Working Group was chartered to develop protocols to support Internet teleconferencing and multimedia communications. These protocols are now reasonably mature, and many have received widespread deployment. The group is now focussed on the revisions of these protocols in the light of implementation experience and additional demands that have arisen from other WGs (such as AVT, SIP, SIPPING, and MEGACO). Multimedia communications protocols use a common platform to express media and session descriptions: the Session Description Protocol, SDP. The many uses of SDP have led to (requests for) numerous extensions and have led to recognition of several flaws in the protocol design. In spite of these, it is widely deployed. - To support this current deployment, MMUSIC will revise SDP suitable for publication as a Draft Standard RFC. This will involve correcting minor bugs and clarifying the current specification. - Various extensions to SDP will be pursued to remedy the most urgent of SDP's shortcomings. These will be limited to use of SDP in conjunction with connection-oriented media such as TCP and SCTP, offering support to work with NATs and firewalls (e.g. via the ICE methodology), and exchange of media session security keys. With the exception of these specific items, only extensions within the existing SDP framework will be done (e.g. registering new codecs and defining parameters for them extending SDP to include new address families). To address the more fundamental issues with SDP, a next generation of SDP, referred to as SDPng, will be needed. An initial proposal is now available, and will be progressed to Experimental RFC while we gain experience with implementations. An informational document will be produced describing how the transition to a new session description protocol can be managed, to prepare implementors for such a future change. MMUSIC will maintain and revise the specification of the Real Time Streaming Protocol (RTSP), including fixes and clarifications based on implementation experience. The revised RTSP specification will be re-issued as a Proposed Standard RFC. We will also document how RTSP can be used in the presence of NAT boxes. An Internet Media Guide (IMG) is a collection of multimedia session descriptions expressed using SDP or some other session description format. It is used to describe a collection of multimedia sessions (e.g. television programme schedules). The IMG must be delivered to a potentially large audience, who use it to join a subset of the sessions described, and who may need to be notified of changes to the IMG. MMUSIC will investigate delivery mechanisms for IMGs, generalizing our work on session announcement and discovery protocols (SAP, RTSP, SIP). We will investigate and document requirements for IMG delivery mechanisms, and identify the requirements that these delivery mechanisms impose on the session description formats used by the IMG. We will then work to produce a framework document outlining the use of (existing) protocols to create an IMG delivery infrastructure. After successful completion of these initial milestones for IMG delivery, the MMUSIC working group will decide whether or not MMUSIC is the proper place to pursue any needed mechanisms for IMGs, and if so, recharter accordingly The MMUSIC work items will be pursued in close coordination with other IETF WGs related to multimedia conferencing and IP telephony (AVT, SIP, SIPPING, SIMPLE, XCON, MEGACO and, where appropriate, MIDCOM and NSIS). Where appropriate, new separate working groups may be split off (as has happened with the SIP WG). The Working Group is also charged with addressing security issues related to the protocols it develops. Goals and Milestones: Jun 04 Submit IMG requirements and framework for Informational Aug 04 Review work on IMGs and update charter accordingly Aug 04 Submit revised SDP spec for Proposed Standard Aug 04 Submit SDP Offer/Answer examples for Informational Sep 04 Submit SDP connection-oriented media draft for Proposed Standard Nov 04 Submit SDPng transition scenarios for Informational Nov 04 Submit SDPng base specification for Experimental Nov 04 Submit ICE draft for Proposed Standard Feb 05 Submit revised RTSP spec for Proposed Standard May 05 Submit RTSP NAT considerations draft Jul 05 Consider update of SDP specification for draft standard Dec 05 Submit updated SDP Offer/Answer examples draft for Informational _______________________________________________ IETF-Announce@ietf.org https://www1.ietf.org/mailman/listinfo/ietf-announce
