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Re: [MMUSIC] BUNDLE ALMOST DECISSION: BUNDLE PORT

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 27 May 2013 09:27 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 ALMOST DECISSION: BUNDLE PORT
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Date: Mon, 27 May 2013 09:27:23 +0000
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Subject: Re: [MMUSIC] BUNDLE ALMOST DECISSION: BUNDLE PORT
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Hi,

>> At the interim yesterday, we agreed to use the SDP BUNDLE group 
>> attribute to indicate on which port bundled media will be sent. In an 
>> SDP offer, the order of the attribute mid values can be used by the 
>> offerer to indicate a "wish", but the first attribute mid value in the 
>> answer indicates where the answerer will eventually send bundled media.
>
>This could be interpreted to mean the first a=mid value in the SDP.
>I'm sure you mean "the first mid value in the a=group:bundle" line.

Yes.

>Or perhaps "the first mid value in the bundle group" - assuming there is a definition that "bundle group" means an a=group:bundle line.

In the draft "bundle group" means (or, at least is supposed to mean :) the bundle grouped m- lines, and in general I think it is better to explicitly mention the line/attribute.

> This can be "future proofed" by saying that the first mid value in the bundle group in the answer that references an m-line with non-zero 
> port value. I realize this adds nothing unless 5888 is revised to permit m-lines with zero port in a bundle group. But at least it will be ready for that, and harms nothing.

I agree, but suggest a little different wording: by saying the first mid value in the group attribute MUST NOT represent a port zero m- line.

Regards,

Christer




> The main usage of this is the "initial offer", when each m- line 
> within a bundle group has a different port value.
>
> So far so good.
>
> The reason I say "almost decision" is because we have started a new 
> discussion regarding updated offers, adding new m- lines etc. We need 
> to make sure that the order-to-mid-values semantics also apply to 
> those, and what restrictions there are when adding m- lines.
>
> But, for now, if you OBJECT to the general principle of using the SDP 
> group attribute mid value order for indicating the port where media 
> will be sent, please indicate so.
>
> Regards,
>
> Christer
>
>
>
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