On 11/18/14 1:30 PM, Ilan Avner wrote:
Hi all,
We are now doing some WEB-RTC interop tests with Chrome Browser, we test both
Audio and Video, currently it looks like Chrome requires SAVPF and while using
Video Chrome also sends a lot of video retransmissions depending on the control
RTCP feedbacks, my question is
1. How common is the SAVPF and do you see a need for SBC's to overcome AVP\SAVP
mismatches
2. Is there a way to work with Chrome\FireFox or any other browser without the
feedback
There was a discussion of this at IETF last week. I forget now if it was
in RTCWEB, MMUSIC, or both. Look at the slides in the proceedings.
The fundamental problem is there is a lot of trouble with this proto
field in the m-line. There are formal rules for what should go there,
but often implementations don't support those. It is compounded by the
use of ICE. With ICE, the transport that will be used for the RTP isn't
known when the offer is sent. It may be UDP or TCP.
Regarding AVP, SAVP, AVPF, SAVPF, I'm not big into RTP, but AFAIK the S
is for Secure, and the F is for Feedback. For RTCWEB S is required and I
think F is recommended. But I'm not certain about that.
Again, check the proceedings of IETF91 - RTCWEB and MMUSIC.
Good Luck,
Thanks
Ilan
-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Dale R.
Worley
Sent: Monday, November 17, 2014 8:47 PM
To: Olle E. Johansson
Cc: sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Warning code SRTP
From: "Olle E. Johansson" <o...@edvina.net>
Which SIP warning code can I use in combination witha 488 response to
indicate that the offer was RTP/SAVP and my UA doesn't support it.
It looks like 302 is the right one. "RTP/SAVP" is the only media transport
protocol (a profile of RTP), but the UA can't use it:
302 Incompatible transport protocol: One or more transport
protocols described in the session description are not
available.
Dale
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