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

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 07 May 2013 19:23 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?
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Date: Tue, 07 May 2013 19:23:21 +0000
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Subject: Re: [MMUSIC] BUNDLE: mandate RTP/RTCP multiplexing?
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Hi,

>I'd just like to point out that AFAIK bundling doesn't *require* ICE.
>So lets not make any assumptions that assume ICE is used.

Agree.

We do need to describe how ICE is used with BUNDLE, but BUNDLE can also be used without ICE.

Regards,

Christer




On 5/6/13 2:00 PM, Dale R. Worley wrote:
>> From: Bernard Aboba <bernard_aboba@hotmail.com>
>>
>>> 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.
>>
>> [BA]  Support for rtcp-mux in the first offer/answer is mandated by 
>> RFC 5761 Section 5.1.3:
>>     The initial SDP offer MUST include this
>>     attribute at the media level to request multiplexing of RTP and RTCP
>>     on a single port.
>
> I don't see how 5761 mandates that a=rtcp-mux MUST be used in the 
> first offer of a bundle negotiation.  The context of your quote is:
>
>     5.1.3.  Interactions with ICE
>     [...]
>     If it is desired to use both ICE and multiplexed RTP and RTCP, the
>     initial offer MUST contain an "a=rtcp-mux" attribute to indicate that
>     RTP and RTCP multiplexing is desired and MUST contain "a=candidate:"
>     lines for both RTP and RTCP along with an "a=rtcp:" line indicating a
>     fallback port for RTCP in the case that the answerer does not support
>     RTP and RTCP multiplexing.  This MUST be done for each media where
>     RTP and RTCP multiplexing is desired.
>
> That is, if the device desires to use both ICE and multiplex, it has 
> to use a=rtcp-mux in the first offer of ICE's set of offers.  But 
> we're talking about bundling, which (in the current design) contains
> *two* ICE cycles, since the second offer (in the bundle spec) is going 
> to restart ICE.  And the device need not "desire" to use "both ICE and 
> multiplexed RTP and RTCP" during the first of the ICE cycles.
>
> Dale
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