Re: [MMUSIC] BUNDLE DECISSION: SDP Answer Restrictions

Paul Kyzivat <pkyzivat@alum.mit.edu> Fri, 24 May 2013 14:41 UTC

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Date: Fri, 24 May 2013 10:41:00 -0400
From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [MMUSIC] BUNDLE DECISSION: SDP Answer Restrictions
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I object to (5) below (see inline).
Otherwise these seem ok to me.

	Thanks,
	Paul

On 5/24/13 8:32 AM, Christer Holmberg wrote:
> Hi,
>
> At the interim meeting yesterday, we agreed on some restrictions
> regarding creating SDP answers containing bundle group(s).
>
> Note that the restrictions 1-3 are simply alignments with RFC 5888, and
> are listed simply for clarification purpose. Restrictions 4 is BUNDLE
> specific. Restriction 5 is also alignment with RFC 5888, as m- lines
> with port zero are not allowed within groups, but we will need some
> clarification text saying that a new offer will have to be sent in order
> to remove a stream (either from a bundle group, or completely from the
> session).
>
> (Note that the text below is not necessarily the wording that will go
> into the draft)
>
> In an SDP answer:
>
> 1)a BUNDLE group MUST NOT be created, unless it was included in the
> associated offer
>
> 2)an m- line MUST NOT be added to a BUNDLE group, unless it was included
> in a BUNDLE group in the associated offer
>
> 3)an m- line MUST NOT be added to another BUNDLE group than the group in
> which was included in the associated offer
>
> 4)an m- line MUST NOT be removed from a BUNDLE group if, in the
> associated offer, an identical port number was indicated for all m-
> lines in a BUNDLE group
>
> 5)an m- line MUST NOT be rejected if, in the associated offer, an
> identical port number was indicated for all m- lines in a BUNDLE group

Where did (5) come from? And what is the justification for it?
I can see no good reason to impose this restriction.

> Note that there is also a discussion regarding bundle offers, e.g. when
> restrictions when adding new m- lines to a bundle. Based on the outcome
> of that, there may be some additional answer restrictions, e.g.
> regarding the change of bundle transport parameters. But, let’s deal
> with that in the offer thread.
>
> So, if anyone OBJECTS to the restrictions above, please indicate so.
>
> Regards,
>
> Christer
>
>
>
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