Multiparty Multimedia Session Control (mmusic) ---------------------------------------------- Charter Last Modified: 2010-02-10 Current Status: Active Working Group Chair(s): Jean-Francois Mule Tom Taylor Real-time Applications and Infrastructure Area Director(s): Robert Sparks Cullen Jennings Real-time Applications and Infrastructure Area Advisor: Robert Sparks Mailing Lists: General Discussion:mmusic@ietf.org To Subscribe: mmusic-request@ietf.org 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 Conduct WG Last Call for SAP Internet-Draft Done Submit a revised Internet Multimedia Conferencing Architecture I-D. Done Submit a revised SIP I-D. Done Submit SDP to the IESG for consideration as a Proposed Standard. Done Submit SAP Internet-Draft to IESG for publication as an Experimental Protocol. Done Conduct WG Last Call for RTSP Internet-Draft. Done Submit Internet-Draft on Internet Multimedia Conferencing Architecture. Done Submit RTSP to IESG for consideration as a Proposed Standard. Done Conduct WG Last Call for SIP Internet-Draft. Done Submit SIP Internet-Draft to IESG for consideration as a Proposed Standard. Done Conduct WG Last Call for SAP Security Internet-Draft. Done Conduct second WG Last Call for SAP. 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 SDP4NAT for Proposed Standard (Informational?) Done Submit SDP source filter extensions for Proposed Standard Done Submit draft on SDPng motivations, comparisons with current SDP capabilities. Request charter review on SDPng work from IAB and IESG. 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 Review work on IMGs and update charter accordingly Done Submit SDP connection-oriented media draft for Proposed Standard Done Submit SDPng transition scenarios for Informational Done Submit ICE draft for Proposed Standard Done Submit updated SDP Offer/Answer examples draft for Informational Done Submit SDP Offer/Answer exchange for enabling file transfer as a Proposed Standard Done Submit QoS Mechanism Selection in SDP as a Proposed Standard Done Submit SDP Capability Negotiations to Proposed Standard Done Submit Source-Specific Media Attributes in SDP as Proposed Standard Done Submit Connectivity Preconditions for SDP Media Streams as Proposed Standard Done Signaling media decoding dependency in SDP Done Submit revised RFC for Grouping of Media Lines in SDP Aug 2009 Submit Considerations for using SDP offer/answer with middleboxes for BCP Sep 2009 Submit SDP extensions for Media Loopback for Proposed Standard Sep 2009 Submit SDP Image Attribute as Proposed Standard Sep 2009 Submit an update to the FEC Grouping Semantics in SDP as Proposed Standard Oct 2009 Submit ICE-TCP draft as a Proposed Standard Oct 2009 SDP extensions for Media Capability Negotiations Nov 2009 Submit SDP extensions for audio media streams over Circuit- Switched bearers as Proposed Standard Dec 2009 Submit revised RTSP spec for Proposed or Draft Standard (as appropriate) Dec 2009 Submit RTSP NAT considerations draft Jan 2010 Submit revised SDP specification to IETF for Proposed Standard Internet-Drafts: Posted Revised I-D Title ------ ------- -------------------------------------------- Feb 2003 Jan 2010 A Network Address Translator (NAT) Traversal mechanism for media controlled by Real-Time Streaming Protocol (RTSP) Oct 2003 Oct 2007 Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols Dec 2004 Oct 2009 An Extension to the Session Description Protocol (SDP) for Media Loopback May 2005 Mar 2009 Connectivity Preconditions for Session Description Protocol Media Streams Mar 2006 Oct 2009 TCP Candidates with Interactive Connectivity Establishment (ICE) Jan 2007 May 2009 SDP Capability Negotiation Jul 2007 Jan 2010 The evaluation of different NAT traversal Techniques for media controlled by Real-time Streaming Protocol (RTSP) Jun 2008 Nov 2009 The SDP (Session Description Protocol) Grouping Framework Jan 2009 Feb 2010 Forward Error Correction Grouping Semantics in Session Description Protocol Feb 2009 Oct 2009 Negotiation of Generic Image Attributes in SDP Feb 2009 Oct 2009 Session Description Protocol (SDP) Extension For Setting Up Audio and Video Media Streams Over Circuit-Switched Bearers In The Public Switched Telephone Network (PSTN) Request For Comments: RFC Stat Published Title ------- -- ----------- ------------------------------------ RFC2326 PS Apr 1998 Real Time Streaming Protocol (RTSP) RFC2327 PS Apr 1998 SDP: Session Description Protocol RFC2543 PS Mar 1999 SIP: Session Initiation Protocol RFC2974 E Oct 2000 Session Announcement Protocol RFC3108 PS May 2001 Conventions for the use of the Session Description Protocol (SDP)for ATM Bearer Connections RFC3259 I May 2002 A Message Bus for Local Coordiantion RFC3266 PS Jul 2002 Support for IPv6 in SDP RFC3264 PS Jul 2002 An Offer/Answer Model with SDP RFC3388 PS Dec 2002 Grouping of media lines in Session Description Protocol SDP RFC3524 PS Apr 2003 Mapping of Media Streams to Resource Reservation Flows RFC3605Standard Oct 2003 RTCP attribute in SDP RFC3890Standard Sep 2004 A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP) RFC4091Standard Jun 2005 The Alternative Network Address Types (ANAT) Semantics for the Session Description Protocol (SDP) Grouping Framework RFC4145Standard Sep 2005 TCP-Based Media Transport in the Session Description Protocol (SDP) RFC4317 I Dec 2005 Session Description Protocol (SDP) Offer/Answer Examples RFC4435 I Apr 2006 A Framework for the Usage of Internet Media Guides (IMGs) RFC4473 I May 2006 Requirements for Internet Media Guides (IMGs) RFC4567 PS Jul 2006 Key Management Extensions for Session Description Protocol (SDP) and Real Time Streaming Protocol (RTSP) RFC4568 PS Jul 2006 Session Description Protocol Security Descriptions for Media Streams RFC4570 PS Jul 2006 Session Description Protocol (SDP) Source Filters RFC4572 PS Jul 2006 Connection-Oriented Media Transport over the Transport Layer Security (TLS) Protocol in the Session Description Protocol (SDP) RFC4566 PS Jul 2006 SDP: Session Description Protocol RFC4574 PS Aug 2006 The Session Description Protocol (SDP) Label Attribute RFC4583 PS Nov 2006 Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams RFC4756 PS Nov 2006 Forward Error Correction Grouping Semantics in Session Description Protocol RFC4796 PS Feb 2007 The Session Description Protocol (SDP) Content Attribute RFC5027 PS Oct 2007 Security Preconditions for Session Description Protocol (SDP) Media Streams RFC5432 PS Mar 2009 Quality of Service (QoS) Mechanism Selection in the Session Description Protocol (SDP) RFC5547 PS May 2009 A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer RFC5576 PS Jun 2009 Source-Specific Media Attributes in the Session Description Protocol (SDP) RFC5583 PS Jul 2009 Signaling Media Decoding Dependency in the Session Description Protocol (SDP)