[MMUSIC] BUNDLE: Accept m- line, reject bundle

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 03 May 2013 13:07 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: BUNDLE: Accept m- line, reject bundle
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Date: Fri, 3 May 2013 13:07:00 +0000
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Subject: [MMUSIC] BUNDLE: Accept m- line, reject bundle
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Hi,

Assume the following case:


1.       An SDP offer contains an m- line associated with a BUNDLE group

2.       The answerer wants to accept the m- line, but wants to reject it being in the specific BUNDLE group.

A few alternatives on how this could be achieved have been presented:

Alt 1.      The answerer accepts the m- line, but does not associate it with a BUNDLE group.

Alt 2.      The answerer accepts the m- line, associates it with a BUNDLE group, and then sends a new offer which removes the m- line from the BUNDLE group.

Alt 3.      The answerer rejects the m- line, and then sends a new offer which adds the m- line outside a BUNDLE group.

In my opinion, Alt 1 does not work, at least not if the offer contains identical port values for the m- lines associated with the BUNDLE group. It would mean that the m- line is not added to a BUNDLE group, but still has the same port value (at least at the offerer side) as the m- lines in the BUNDLE group, which is not allowed.

So, my suggestion would be to specify that the answerer must use Alt 2 and/or Alt 3.

Comments?

Regards,

Christer