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Re: [MMUSIC] When a bundle offer is forked

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 24 May 2013 08:25 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Dale R. Worley" <worley@ariadne.com>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Thread-Topic: [MMUSIC] When a bundle offer is forked
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Date: Fri, 24 May 2013 08:24:50 +0000
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References: <7594FB04B1934943A5C02806D1A2204B1C374357@ESESSMB209.ericsson.se> <519A1336.9010001@jitsi.org> <9F33F40F6F2CD847824537F3C4E37DDF1159D127@MCHP04MSX.global-ad.net> <519A229D.7090204@jitsi.org> <7594FB04B1934943A5C02806D1A2204B1C374463@ESESSMB209.ericsson.se> <519A2768.5010904@alum.mit.edu> <CAPvvaa+A=LkYp9A+wENAABwCYaQcD0HVeX4o+O_16iJRPXZfNw@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B1C3744DC@ESESSMB209.ericsson.se> <CAPvvaaJsPNk1DAJXYoc8aUgZ0ZayV_8q84W=Mm7vwuRRGuwC-g@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B1C374572@ESESSMB209.ericsson.se> <519A3883.8060006@jitsi.org> <519A3C8F.3040309@alum.mit.edu> <519B343A.30704@jitsi.org> <519BB598.1030909@alum.mit.edu> <519DF0F8.1070407@jitsi.org> <519E530C.60705@alum.mit.edu> <201305232206.r4NM6l5C5338062@shell01.TheWorld.com>
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] When a bundle offer is forked
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Hi,

I agree with Dale. Each early dialog is handled separately.

>From a standards perspective, I don't think we need to say much about forking in BUNDLE, other than maybe some general words that it may happen.

Then, whether it becomes tricky to implement, e.g. if one early leg uses BUNDLE and another doesn't, is another issue. But, as SIP has mechanisms to terminate early dialogs you don't like etc, I see this as a pure implementation issue.

Regards,

Christer





-----Original Message-----
From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On Behalf Of Dale R. Worley
Sent: 24. toukokuuta 2013 1:07
To: Paul Kyzivat
Cc: mmusic@ietf.org
Subject: Re: [MMUSIC] When a bundle offer is forked

> From: Paul Kyzivat <pkyzivat@alum.mit.edu>
> 
> On 5/23/13 6:35 AM, Emil Ivov wrote:
> 
> > In case a bundle offer gets forked and various answers ...
> 
> I trimmed everything else out of Emil's reply, and changed to subject, 
> because this is a whole different can of worms!
> 
> I think we must acknowledge that this *can* happen, though it is a low 
> probability event. It raises all sorts of ugly issues. A few:

Is this actually complicated?  That is, worse than is already the case in SIP...

My understanding is that in SIP (and this must be a SIP situation), each fork proceeds with completely independent state from all other forks.  The forks happen to share sending/receiving ports, but the received packets can be demultiplexed to the correct fork based on their sending addresses.  Of course, there are a range of obnoxious situations where you receive packets before you receive a SIP response (SDP answer) that describes them, but that is true in non-bundled SIP as well.

Dale
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