[MMUSIC] RTSP: Usage of RTP and RTCP Muxing with RTSP media sessions

[Magnus Westerlund <magnus.westerlund at ericsson.com>]

Hi,

draft-ietf-avt-rtp-and-rtcp-mux-07 is currently in the RFC-editor queue.
If we allow for RTP and RTCP muxing with RTSP we can half the port
consumption for a RTSP based streaming server. Or at least avoid RTCP
using additional ports which has been a major complaint from vendors of
high capacity servers. As I can see this can be introduced in the
following ways:

A. Mandate that RTCP MUX shall be supported by RTSP 2.0 servers and
clients supporting RTP transport. A flag indicate may be used to
indicate if RTCP is to be used or not instead of the extra port.

B. Allow RTP and RTCP muxing to be optional to support. Include a flag
to negotiate this usage. Only when both side indicate support is muxing
performed.

I think A is easier and more interoperable in the long run. However it
increase the burden in the transition period from RTSP 1.0 to 2.0.

Please provide feedback on which proposal you favor and why.

Cheers

Magnus Westerlund

IETF Transport Area Director & TSVWG Chair
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Multimedia Technologies, Ericsson Research EAB/TVM/M
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Ericsson AB                | Phone +46 8 4048287
Torshamsgatan 23           | Fax   +46 8 7575550
S-164 80 Stockholm, Sweden | mailto: magnus.westerlund at ericsson.com
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