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

Christer Holmberg <christer.holmberg@ericsson.com> Sat, 04 May 2013 06:16 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: BUNDLE: Accept m- line, reject bundle
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Date: Sat, 4 May 2013 06:15:55 +0000
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Subject: Re: [MMUSIC] BUNDLE: Accept m- line, reject bundle
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Hi Charles,

Just to clarify, I am talking about a case where the answerer DOES support BUNDLE, but for some reason it does not want to accept the m- line within a BUNDLE group.

Regards,

Christer
________________________________________
From: Charles Eckel (eckelcu) [eckelcu@cisco.com]
Sent: Saturday, 04 May 2013 7:40 AM
To: Christer Holmberg; mmusic@ietf.org
Subject: RE: BUNDLE: Accept m- line, reject bundle

> -----Original Message-----
> From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org]
> On Behalf Of Christer Holmberg
> Sent: Friday, May 03, 2013 6:07 AM
> To: mmusic@ietf.org
> Subject: [MMUSIC] BUNDLE: Accept m- line, reject bundle
>
> 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.

True, but isn't that precisely what will happen if the answerer does not understand/support BUNDLE?
So at this point the offerer could choose to send a re-INVITE to use different receive ports for the non-bundled m-lines.
I would not put that burden on the answerer.

Cheers,
Charles

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