WG Action: Rechartered Multiparty Multimedia Session Control (mmusic)

The IESG <iesg-secretary@ietf.org> Fri, 05 February 2016 17:23 UTC

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From: The IESG <iesg-secretary@ietf.org>
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Subject: WG Action: Rechartered Multiparty Multimedia Session Control (mmusic)
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The Multiparty Multimedia Session Control (mmusic) WG in the Applications
and Real-Time Area of the IETF has been rechartered. For additional
information, please contact the Area Directors or the WG Chairs.

Multiparty Multimedia Session Control (mmusic)
Current status: Active WG

  Flemming Andreasen <fandreas@cisco.com>
  Bo Burman <bo.burman@ericsson.com>

Assigned Area Director:
  Ben Campbell <ben@nostrum.com>

Mailing list:
  Address: mmusic@ietf.org
  To subscribe: https://www.ietf.org/mailman/listinfo/mmusic
  Archive: https://mailarchive.ietf.org/arch/browse/mmusic/

Charter: https://datatracker.ietf.org/doc/charter-ietf-mmusic/

The Multiparty MUltimedia SessIon Control (MMUSIC) Working Group was 
originally chartered to develop protocols to support Internet 
teleconferencing and multimedia communications. These protocols are now 
reasonably mature, and many have received widespread deployment. 
Currently, the group is focused on using and negotiating media streams 
with the Session Description Protocol (SDP), which is used as a common 
protocol to express media and session descriptions. The group also 
maintains the Real-time Streaming Protocol (RTSP) specifications.

The group has revised these protocols in the light of implementation 
experience and additional demands that have arisen from other WGs (such 
as AVTCORE, CLUE, ICE, and RTCWEB). In particular, the many uses of SDP 
have led to requests for numerous extensions as well as a recognition of 
several limitations in the original protocol design. Today, the SDP 
protocol is widely deployed and continues to see extensions being

The current aims of the working group include the following:

- Provide SDP signaling support for the Interactive Connectivity 
Establishment (ICE) protocol and its extensions. These were originally 
defined in MMUSIC, but are now handled by the ICE WG.
- To support the establishment of multi-party multimedia sessions for 
RTCWEB based implementations, MMUSIC provides SDP signaling support for 
a number of extensions required by RTCWEB. The MMUSIC WG will seek a 
balanced trade-off between general applicability of such extensions 
versus RTCWEB specific usage.
- Various other extensions to SDP may be pursued to remedy the most 
urgent of SDP's shortcomings. These include updates to the SDP 
specification itself and missing IANA registrations.
- With the exception of the items listed above, only extensions within 
the existing SDP framework will be done.
- Maintain the specification of the (revised) Real Time Streaming 
Protocol (RTSP) as needed.

The MMUSIC work items will be pursued in close coordination with other 
IETF WGs including AVTCORE, CLUE, ICE, RTCWEB and SIPCORE, as well as 
others where appropriate.

  Dec 2015 - Submit SDP extensions to negotiate multiplexed media streams
as Proposed Standard
  Dec 2015 - Submit SDP extension for cross session stream identification
as Proposed Standard
  Dec 2015 - Submit a framework for SDP attributes when multiplexing as
Proposed Standard
  Dec 2015 - Submit SDP Negotiation of DataChannel sub-protocols as
Proposed Standard
  Dec 2015 - Submit IANA registrations of SDP 'proto' attribute for
transporting RTP Media over TCP under various RTP profiles as Proposed
  Jan 2016 - Submit Using Simulcast in SDP and RTP Sessions as Proposed
  Feb 2016 - Submit SIP usage for Trickle ICE as Proposed Standard
  Feb 2016 - Using the SDP Offer/Answer Mechanism for DTLS
  Feb 2016 - Submit RTP Payload Format Constraints as Proposed Standard
  Mar 2016 - Submit revised SDP specification to IETF as Proposed
  Mar 2016 - Submit MSRP over Data Channels as Proposed Standard
  Apr 2016 - Submit Interactive Connectivity Establishment (ICE) with SDP
offer/answer and SIP as Proposed Standard
  May 2016 - Submit SCTP-Based Media Transport in SDP as Proposed
  May 2016 - Submit Indicating Exclusive Support of RTP/RTCP Multiplexing
using SDP as Proposed Standard