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Re: [BEHAVE] [AVT] Working Group LastCall: draft-ietf-avt-app-rtp-keepalive-03.txt

"Xavier Marjou" <xavier.marjou@orange-ftgroup.com> Tue, 03 June 2008 08:42 UTC

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Date: Tue, 03 Jun 2008 10:42:47 +0200
From: Xavier Marjou <xavier.marjou@orange-ftgroup.com>
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Subject: Re: [BEHAVE] [AVT] Working Group LastCall: draft-ietf-avt-app-rtp-keepalive-03.txt
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This mail tries to sum-up the conversations of the WGLC and makes
proposals for a next update of the draft.

1 - 0 bytes packets:
There's a need to merge sections 4.1 and 4.2 and to generalize the
section for any RTP-capable transport protocol.

2 - static payload
There is no consensus to accept a static payload number for
rtp-keepalive, so the draft will keep a dynamic payload type.

3 - Advertisement of rtp-keepalive with SDP
There's some interest to declare support for rtp-keepalive in the SDP.
Do we want to make it mandatory or recommended?

Note that doing so requires the registration of additional media types
(like audio/rtp-keepalive, video/rtp-keepalive, and
text/rtp-keepalive, application/rtp-keepalive). In addition, it should
also be noted the indication for rtp-keepalive support within an SDP
offer is a declarative usage only, as the the local agent will use
rtp-keepalive even if the peer does not support this format in the SDP
answer.

4 - Security issues
There's a need to discuss that RTP keepalive packets may be perceived
as an attack by the peer and that the peer needs to react as described
by RFC3550 by ignoring them.
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