Re: [MMUSIC] BUNDLE DECISSION: SDP Answer Restrictions

Can someone please explain why a m-line can be rejected when the port
numbers are different, but not if all the port numbers are the same?

On 24 May 2013 13:32, Christer Holmberg <christer.holmberg@ericsson.com>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*
> ***
>
> ** **
>
> ** **
>
> 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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