WG Action: RECHARTER: Multiparty Multimedia Session Control (mmusic)
The Multiparty Multimedia Session Control (mmusic) working group in the Real-time Applications and Infrastructure Area of the IETF has been rechartered. For additional information, please contact the Area Directors or the working group Chairs. Multiparty Multimedia Session Control (mmusic) -- Last Modified: 2008-3-27 Current Status: Active Working Group Chair(s): Joerg Ott ([EMAIL PROTECTED]) Jean-Francois Mule ([EMAIL PROTECTED]) Real-time Applications and Infrastructure Area Director(s): Jon Peterson ([EMAIL PROTECTED]) Cullen Jennings ([EMAIL PROTECTED]) Real-time Applications and Infrastructure Area Advisor: Cullen Jennings ([EMAIL PROTECTED]) Mailing Lists: General Discussion: [EMAIL PROTECTED] To Subscribe: [EMAIL PROTECTED] In Body: subscribe your_email_address Archive: http://www.ietf.org/mail-archive/web/mmusic/index.html Description of 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 deployments. The group has revised some of these protocols in the light of implementation experience and additional demands that have arisen from other WGs (such as AVT, SIP, and SIPPING). It is focused on using and negotiating mechanisms such STUN and TURN in order to enable media sessions to traverse Network Address Translators NATs, and on new means to exchange SDP capabilities. 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, some of which were addressed in the revision of SDP. In spite of these, it is widely deployed. The current aims of the working group include the following: - To support the establishment of multi-party multimedia sessions across NATs, MMUSIC will define an Internet Connectivity Establishment protocol (ICE). This will define several SDP extensions to work with NATs for media sessions carried over both UDP and TCP. - Various extensions to SDP will be pursued to remedy the most urgent of SDP's shortcomings. These will be limited and include adding support for limited but generic capability negotiations in SDP, defining the means to select QoS mechanisms to use for a particular media stream, enabling file transfer via the SDP Offer/Answer model, and support for media loopback. 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 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. The MMUSIC work items will be pursued in close coordination with other IETF WGs including AVT, SIP, SIPPING, SIMPLE, XCON, and BEHAVE, as well as others where appropriate such as NSIS. Goals and Milestones: Done Submit SDP to the IESG for consideration as a Proposed Standard. Done Submit RTSP to IESG for consideration as a Proposed Standard. Done Submit SIP Internet-Draft to IESG for consideration as a Proposed Standard. Done Submit SAP Internet-Draft to IESG for consideration as a Proposed Standard. Done Submit SAP Security Internet-Draft to IESG for consideration as a Proposed Standard. Done Submit IPv6 Extensions to SDP for Proposed Standard Done Submit SIP's offer/answer use of SDP for Proposed Standard Done Submit SDP source filter extensions for Proposed Standard Done Submit draft on SDPng motivations, comparisons with current SDP capabilities. Done Submit SDP security extension for Proposed Standard Done Submit IMG requirements and framework for Informational Done Submit revised SDP spec for Proposed (or Draft) Standard Done Submit SDP Offer/Answer examples for Informational Done Submit SDP connection-oriented media draft for Proposed Standard Cancelled Submit SDPng transition scenarios for Informational Done Submit updated SDP Offer/Answer examples draft for Informational Done Submit Security preconditions for SDP for Proposed Standard Done Submit ICE draft as a Proposed Standard February 2008 Submit SDP Capability Negotiations to Proposed Standard February 2008 Submit QoS Mechanism Selection in SDP as a Proposed Standard February 2008 Submit SDP Offer/Answer exchange for enabling file transfer as a Proposed Standard March 2008 Submit SDP extensions for Media Loopback for Proposed Standard March 2008 Submit Source-Specific Media Attributes in SDP as Proposed Standard March 2008 Submit Considerations fo
WG Action: RECHARTER: Multiparty Multimedia Session Control (mmusic)
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 <[EMAIL PROTECTED]> Colin Perkins <[EMAIL PROTECTED]> Transport Area Directors: Allison Mankin <[EMAIL PROTECTED]> Jon Peterson <[EMAIL PROTECTED]> Transport Area Advisor: Jon Peterson <[EMAIL PROTECTED]> Mailing Lists: General Discussion: [EMAIL PROTECTED] To Subscribe: [EMAIL PROTECTED] 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 specificati
