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Re: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?

Justin Uberti <juberti@google.com> Fri, 03 May 2013 01:57 UTC

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References: <7594FB04B1934943A5C02806D1A2204B1C368E12@ESESSMB209.ericsson.se> <517FFB7E.8050801@alum.mit.edu> <CABkgnnVf6f3RrP2h66_8hFPZScWU3Xp4f1x0dmW0xhmvZRQ70Q@mail.gmail.com> <51801BBD.1010505@alum.mit.edu> <CAOJ7v-12j0k1W7GRfOzvPmfN-BZ0ve=fHVcWy+avronfc8wFYw@mail.gmail.com> <7594FB04B1934943A5C02806D1A2204B1C369709@ESESSMB209.ericsson.se> <CE0F590A-D948-4702-9082-FDE0DCBFB698@cisco.com> <7594FB04B1934943A5C02806D1A2204B1C3699A8@ESESSMB209.ericsson.se> <201305030115.r431Fis33999826@shell01.TheWorld.com>
From: Justin Uberti <juberti@google.com>
Date: Thu, 02 May 2013 18:56:54 -0700
Message-ID: <CAOJ7v-1waHjQeKOzRCqW+kGmK6Y8PaqYwWsAxHP9fGZJNGfH+g@mail.gmail.com>
To: "Dale R. Worley" <worley@ariadne.com>
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Cc: "mmusic@ietf.org" <mmusic@ietf.org>, Christer Holmberg <christer.holmberg@ericsson.com>
Subject: Re: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?
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Bundling is done during the first offer/answer. Any subsequent ones are
just for the benefit of middleboxes.

Mandating rtcp-mux for BUNDLE, even in the first offer/answer, avoids a
couple ugly edge cases.


On Thu, May 2, 2013 at 6:15 PM, Dale R. Worley <worley@ariadne.com> wrote:

> > From: Christer Holmberg <christer.holmberg@ericsson.com>
> >
> > In fact, I noticed that, in the second offer, BUNDLE already
> > mandates it in both the offer and answer :)
> >
> > So, the only addition would be to mandate it also in the first answer.
>
> I can see why it would be useful to mandate rtcp-mux in the bundled
> offer/answer, because it is more port-efficient, and the code that
> handles the multiplexing and demultiplexing the constituent streams
> only has to handle the case where the RTCP is multiplexed with the
> RTP.
>
> But it doesn't seem that there is much to gain by mandating rtcp-mux
> in the first offer/answer, the one where actual bundling is not being
> done.  All of the RTP/RTCP routing code that is active at that point
> has to support non-rtcp-mux operation already.
>
> Dale
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