Subject: Re: [MMUSIC] Feedback requested on requirements - DES F7

From: Christer Holmberg <[email-masked]>
Date: Wed, 17 Apr 2013 11:22:05 +0000

Hi,

>>    DES F7  If an answerer that does understand the bundle mechanism
>>       processes an offer that contains a bundle, it must be able to (1)
>>       accept the bundle and selectively accept or reject each
>>       constituent RTP session within it, (2) reject the bundle as a
>>       whole, or (3) reject the bundling and selectively accept or reject
>>       each constituent RTP session as separate RTP sessions.
>
> If you with "constituent RTP session within it" where it is a bundle means the RTP media streams resulting from that particular SDP media description (m= block) then I believe I agree with 1).

Agree. It shall be possible to reject/accept each m- line individually.

> When it comes to 2) what makes this different from rejecting each m= block within the bundle?

Agree. Putting the port to zero is the SDP offer/answer mechanism for rejecting an m- line, and bundle doesn't change that. 

> 3) is required if legacy fallback at all going to be available.

As currently specified, this is achieved by sending a "legacy" SDP answer, without bundle.

Regards,

Christer