Re: [rtcweb] AVPF vs AVP
"Roni Even" <ron.even.tlv@gmail.com> Fri, 16 September 2011 13:02 UTC
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From: Roni Even <ron.even.tlv@gmail.com>
To: 'Magnus Westerlund' <magnus.westerlund@ericsson.com>, rtcweb@ietf.org
References: <4E70C387.1070707@ericsson.com>
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Date: Fri, 16 Sep 2011 16:03:34 +0300
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Subject: Re: [rtcweb] AVPF vs AVP
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Magnus, Maybe we can take the approach from draft-holmberg-mmusic-sdp-multiplex-negotiation and offer the same m-line with the same port number twice, one as AVP and one as AVPF and let the other side chose, he can answer with a port=0 for the profile it does not want. If the multiplex proposal has backward interoperability than this proposal also does. Roni Even > -----Original Message----- > From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On > Behalf Of Magnus Westerlund > Sent: Wednesday, September 14, 2011 6:09 PM > To: rtcweb@ietf.org > Subject: [rtcweb] AVPF vs AVP > > Hi, > > There has been this long thread with the subject partially containing > "AVPF". I want to clarify something in this context around AVPF. Rather > than the SRTP question. > > An end-point that is AVPF compliant is in fact interoperable with an > AVP > one as long as the trr-int parameter is set reasonably large. A > parameter value of 1.5-5 seconds (I would recommend 3s) will ensure > that > they are in fact compatible. This avoids the risk of any side timing > out > the other if the AVP side is using the default 5 s minimum interval. > > Based on this one could in fact have the RTCWEB nodes always use AVPF > for RTP/RTCP Behavior. The AVPF feedback messages are explicitly > negotiated and will only be used when agreed on. > > This leaves us with any signaling incompatibilities when talking to a > legacy device. If one don't want to use cap-neg I see two directions to > go: > > 1) RTCWEB end-point will always signal AVPF or SAVPF. I signalling > gateway to legacy will change that by removing the F to AVP or SAVP. > > 2) RTCWEB end-point will always use AVPF but signal it as AVP. It will > detect the AVPF capabilities of the other end-point based on the > signaling of the feedback events intended to be used. > > I think 1) is cleaner for the future. 2) might be more pragmatic. > > In both cases I believe there are methods for negotiating a lower > trr-int than some AVP fallback value to preserve interoperability. > > > However, this still don't resolve the question if the "S" should be in > front of the RTP profile indicator or not. But it might help by > removing > the F or not in the profile. > > Cheers > > Magnus Westerlund > > ---------------------------------------------------------------------- > Multimedia Technologies, Ericsson Research EAB/TVM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > Färögatan 6 | Mobile +46 73 0949079 > SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com > ---------------------------------------------------------------------- > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb
- Re: [rtcweb] AVPF vs AVP Hadriel Kaplan
- Re: [rtcweb] AVPF vs AVP Harald Alvestrand
- Re: [rtcweb] AVPF vs AVP Bernard Aboba
- [rtcweb] AVPF vs AVP Magnus Westerlund
- Re: [rtcweb] AVPF vs AVP Randell Jesup
- Re: [rtcweb] AVPF vs AVP Charles Eckel (eckelcu)
- Re: [rtcweb] AVPF vs AVP Harald Alvestrand
- Re: [rtcweb] AVPF vs AVP Hadriel Kaplan
- Re: [rtcweb] AVPF vs AVP Magnus Westerlund
- Re: [rtcweb] AVPF vs AVP Magnus Westerlund
- Re: [rtcweb] AVPF vs AVP Harald Alvestrand
- Re: [rtcweb] AVPF vs AVP Roni Even
- Re: [rtcweb] AVPF vs AVP Roni Even
- Re: [rtcweb] AVPF vs AVP Magnus Westerlund
- Re: [rtcweb] AVPF vs AVP Christer Holmberg
- Re: [rtcweb] AVPF vs AVP Roni Even
- Re: [rtcweb] AVPF vs AVP Roni Even
- Re: [rtcweb] AVPF vs AVP Christer Holmberg
- Re: [rtcweb] AVPF vs AVP Christer Holmberg
- Re: [rtcweb] AVPF vs AVP Roni Even
- Re: [rtcweb] AVPF vs AVP Roni Even
- Re: [rtcweb] AVPF vs AVP Christer Holmberg
- Re: [rtcweb] AVPF vs AVP Roni Even
- Re: [rtcweb] AVPF vs AVP Magnus Westerlund
- Re: [rtcweb] AVPF vs AVP Christer Holmberg