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Tuesday, April 8, 2008

XML Schema for Media Control

IETF announced that a new Request for Comments "XML Schema for Media
Control" is now available in online RFC libraries. The specification
has been produced by members of the IETF Multiparty Multimedia Session
Control (MMUSIC) Working Group. The RFC 5168 document defines an
Extensible Markup Language (XML) Schema for video fast update in a
tightly controlled environment, developed by Microsoft, Polycom,
Radvision and used by multiple vendors. This document describes a
method that has been deployed in Session Initiation Protocol (SIP)
based systems over the last three years and is being used across
real-time interactive applications from different vendors in an
interoperable manner. New implementations are discouraged from using
the method described except for backward compatibility purposes. New
implementations are required to use the new Full Intra Request command
in the RTP Control Protocol (RTCP) channel. 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)... The MMUSIC work items
are 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).

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