Re: [splices] Using Two Separate Devices to Start a Conversation proposal
Paul Kyzivat <pkyzivat@cisco.com> Mon, 06 June 2011 23:45 UTC
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Date: Mon, 06 Jun 2011 19:45:49 -0400
From: Paul Kyzivat <pkyzivat@cisco.com>
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Subject: Re: [splices] Using Two Separate Devices to Start a Conversation proposal
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I suspect asymmetric rtp *won't* work a lot of the time, for many reasons, whether we think they are reasonable or not. Maybe this is just an unreasonable use case. I can't really imagine wanting to do this. If I have a handset, or headset, with a mic, it probably has a "speaker" too, and it would seem weird using the mic and not its speaker too. And when they are separate there is likely to be problems with echos. Thanks, Paul On 6/6/2011 7:27 PM, Peter Musgrave wrote: > Hi all, > > My assumptions were that: > - Alice's desk phone is doing the media aggregation and creating a > reINVITE for Bob with a=sendrecv and asymmetric media: > * media is sent from Bob to Alice desk phone > * media is sent from Alice Computer to Bob > > As far as Bob knows this is a dialog only with Alice's deskphone. Bob > does not have to support SPLICES or do anything special. > > Bob must handle asymmetric RTP from Alice. > > Ok? > > I agree that requiring media relay does become a bad idea when the > relaying element is e.g a cellphone. > > Do we think that having asymmetric RTP will be ok? A lot of > implementation have worked toward symmetric RTP (and some will only play > RTP arriving from the place they are sending to! [1 implementation at > SIPIT28, 3 at SIPIT27 - so maybe not worth worrying about]). Are there > any issues with ZRTP or use of ICE? [I am not an ICE expert so I can't > recall if symmetric RTP was baked into ICE, umm "frozen in" to ICE maybe?] > > Regards, > > Peter > > > > > > On Mon, Jun 6, 2011 at 5:45 PM, Alan Johnston <alan.b.johnston@gmail.com > <mailto:alan.b.johnston@gmail.com>> wrote: > > But isn't the INVITE Join received at Alice's Desk Phone? If so, then > a normal Join will result in Alice's Desk Phone performing mixing of > audio streams from Alice's PC, Alice's Desk Phone, and Bob. I thought > what was desired (and shown by Rifaat's flow) was that Alice's Desk > phone did not mix the media, but instead inserted/spliced the media > from Alice's PC into the dialog with Bob, resulting in a re-INVITE to > Bob with two m= lines. > > - Alan - > > On Mon, Jun 6, 2011 at 4:15 PM, Worley, Dale R (Dale) > <dworley@avaya.com <mailto:dworley@avaya.com>> wrote: > > No, surely it is an ordinary join. At the far UA, there are two > incoming dialogs, each with one audio m= line. The only oddity is > that one dialog is recvonly (at the far UA), and so is never sent > media. The other dialog is sendonly (at the far UA) and so never > provides audio to the mixing, but is only sent the result of the > mixing. The effect is that the far UA's input audio is sent only to > the second dialog, and the far UA's output audio is driven only by > the first dialog. > > > > Dale > > > _______________________________________________ > splices mailing list > splices@ietf.org <mailto:splices@ietf.org> > https://www.ietf.org/mailman/listinfo/splices > > > > > _______________________________________________ > splices mailing list > splices@ietf.org > https://www.ietf.org/mailman/listinfo/splices
- [splices] Using Two Separate Devices to Start a C… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Using Two Separate Devices to Start… Peter Musgrave
- Re: [splices] Using Two Separate Devices to Start… Worley, Dale R (Dale)
- Re: [splices] Using Two Separate Devices to Start… Worley, Dale R (Dale)
- Re: [splices] Using Two Separate Devices to Start… Alan Johnston
- Re: [splices] Using Two Separate Devices to Start… Paul Kyzivat
- Re: [splices] Using Two Separate Devices to Start… Paul Kyzivat
- Re: [splices] Using Two Separate Devices to Start… Worley, Dale R (Dale)
- Re: [splices] Using Two Separate Devices to Start… Worley, Dale R (Dale)
- Re: [splices] Using Two Separate Devices to Start… Alan Johnston
- Re: [splices] Using Two Separate Devices to Start… Worley, Dale R (Dale)
- Re: [splices] Using Two Separate Devices to Start… Alan Johnston
- Re: [splices] Using Two Separate Devices to Start… Paul Kyzivat
- Re: [splices] Using Two Separate Devices to Start… Peter Musgrave
- Re: [splices] Using Two Separate Devices to Start… Paul Kyzivat
- Re: [splices] Using Two Separate Devices to Start… Shekh-Yusef, Rifaat (Rifaat)
- Re: [splices] Using Two Separate Devices to Start… Peter Musgrave
- Re: [splices] Using Two Separate Devices to Start… Gonzalo Camarillo
- Re: [splices] Using Two Separate Devices to Start… Paul Kyzivat
- Re: [splices] Using Two Separate Devices to Start… Gonzalo Camarillo
- Re: [splices] Using Two Separate Devices to Start… Worley, Dale R (Dale)
- Re: [splices] Using Two Separate Devices to Start… Paul Kyzivat
- Re: [splices] Using Two Separate Devices to Start… Worley, Dale R (Dale)