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Re: [AVT] Draft minutes from Chicago meeting

One comment on the minutes.

Colin Perkins skrev:


RTP Keep Alive

   draft-ietf-avt-app-rtp-keepalive-00

   Xavier Marjou presented the draft on RTP keep alive. This draft gives a
   list of mechanisms used to keep alive NAT bindings, and details the pros
   and cons of each. Mechanisms surveyed include 0 byte UDP packet, RTCP
   multiplexed on the RTP port, STUN packets, RTP packets with incorrect
   version number, RTP packets with comfort noise, RTP packets with a no-op
   payload, and RTP packets with unknown payload type. Xavier asked if any
   other mechanism were known (perhaps RTSP transport of RTP), and if we
   want to recommend one mechanism.

Magnus Westerlund noted that RTSP encapsulation of RTP is TCP-based, so
the usual TCP keep alive mechanism will be used to maintain NAT bindings,
out of the scope of this document. Jonathan Lennox noted that there are
often codec specific keep alive mechanisms, in addition to comfort noise.

I think I actually said that the RTSP session keep-alive over the same TCP connection is what will keep it alive. In addition that timeouts on TCP is much less of a problem.

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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