XML Schema for Media Control

IESG announced that members of the IETF Multiparty Multimedia Session
Control (MMUSIC) Working Group have released an Internet Draft for
consideration as an IETF Informational RFC. The IESG plans to make a
decision in the next few weeks, and solicits final comments on this
proposed action. The document defines an XML Schema for video fast
update request in a tightly controlled environment, developed by
Microsoft, Polycom, Radvision and used by multiple vendors.
Implementation of this schema for interactive video applications in
SIP environments was designed in order to improve user experience.
This mechanism is being used by both end user video conferencing
terminals and conferencing servers in shipping products. This document
describes the current method, but new implementations are discouraged
from using this method, except for backward compatibility with legacy
systems. Shipping products and new products SHALL use the full intra
request described in "Codec Control Messages in the RTP Audio-Visual
Profile with Feedback (AVPF)". Sending video fast update using the
SIP signaling path, as described in this document, is inferior to
using the RTCP feedback method, since the command flows through all
the proxies in the signaling path adding delay to the messages and
causing unnecessary overload to the proxies. RTCP messages flow end
to end and not through the signaling proxies. The RTCP feedback draft
also adds other required control functions, such as flow control
command which is missing from this document. The IETF Multiparty
MUltimedia SessIon Control (MMUSIC) Working Group was chartered to
develop protocols to support Internet teleconferencing and multimedia
communications. More Information See also the IETF Multiparty Multimedia Session Control (MMUSIC) WG Click Here