Re: [rtcweb] SAVPF history (Re: Final plea about SRTP)
Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 08 May 2012 13:49 UTC
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Date: Tue, 08 May 2012 15:49:30 +0200
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: Roman Shpount <roman@telurix.com>
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] SAVPF history (Re: Final plea about SRTP)
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On 2012-05-08 15:34, Roman Shpount wrote: > I would say that something that changes to rfc4585 would be more > relevant. Regardless of the actual changes in the draft, my point is > there are very few actual SIP devices that implement SAVPF or AVPF. > Specifying this as the only profile supported by WebRTC will create yet > another challenge to legacy interop, since it will require not only > processing of ICE messages, and DTLS-SRTP re-encoding, but also RTCP > re-generation. Hi, Here I have to protest that it increases the barrier. First of all the S in SAVPF is for using SRTP. That is already agreed on in this WG. Secondly the F stands for the feedback part. That consists of two parts: 1) New Timer Rules 2) Feedback RTCP packets The second is actually negotiated on a per individual feedback format basis. So only the first is what really what would be mandated by a WebRTC requirement of SAVPF. From my perspective to get the RTP/RTCP functionalities needed to give a good user experience we really need the timing rules. When it comes to legacy interop a signalling gateway can actually produce a SAVPF configuration that is fully interopable with an SAVP end-point. The configuration required to make this interoperable are: use a=rtcp-fb to sett trr-int to 3.5 to 4 seconds and ensure that the same or at least sufficient RTCP bandwidth is configured and that no feedback format are agreed on being used. So please don't be afraid of SAVPF. 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] Final plea about SRTP Roman Shpount
- Re: [rtcweb] Final plea about SRTP Cullen Jennings
- Re: [rtcweb] Final plea about SRTP Roman Shpount
- Re: [rtcweb] Final plea about SRTP Bernard Aboba
- Re: [rtcweb] Final plea about SRTP Roman Shpount
- Re: [rtcweb] Final plea about SRTP jesse
- [rtcweb] SAVPF history (Re: Final plea about SRTP) Harald Alvestrand
- Re: [rtcweb] Final plea about SRTP Magnus Westerlund
- Re: [rtcweb] Final plea about SRTP Fabio Pietrosanti (naif)
- Re: [rtcweb] Final plea about SRTP Magnus Westerlund
- Re: [rtcweb] Final plea about SRTP Roman Shpount
- Re: [rtcweb] Final plea about SRTP Randell Jesup
- Re: [rtcweb] Final plea about SRTP Roman Shpount
- Re: [rtcweb] SAVPF history (Re: Final plea about … Roman Shpount
- Re: [rtcweb] SAVPF history (Re: Final plea about … Magnus Westerlund
- Re: [rtcweb] SAVPF history (Re: Final plea about … Randell Jesup