Re: [MMUSIC] AD Evaluation of draft-ietf-mmusic-rfc4566bis-32: Media Description

"Roni Even (A)" <roni.even@huawei.com> Thu, 21 February 2019 08:03 UTC

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From: "Roni Even (A)" <roni.even@huawei.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, Ben Campbell <ben@nostrum.com>, "draft-ietf-mmusic-rfc4566bis.all@ietf.org" <draft-ietf-mmusic-rfc4566bis.all@ietf.org>
CC: Magnus Westerlund <magnus.westerlund@ericsson.com>, mmusic WG <mmusic@ietf.org>, 'Colin Perkins' <csp@csperkins.org>
Thread-Topic: [MMUSIC] AD Evaluation of draft-ietf-mmusic-rfc4566bis-32: Media Description
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Date: Thu, 21 Feb 2019 08:03:15 +0000
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Subject: Re: [MMUSIC] AD Evaluation of draft-ietf-mmusic-rfc4566bis-32: Media Description
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Hi Paul,
I think the semantics is that it includes all attributes that describe a specific media on top of the session description and can override session attributes for this specific media
Roni

-----Original Message-----
From: Paul Kyzivat [mailto:pkyzivat@alum.mit.edu] 
Sent: Tuesday, February 19, 2019 5:48 PM
To: Roni Even (A); Ben Campbell; draft-ietf-mmusic-rfc4566bis.all@ietf.org
Cc: Magnus Westerlund; mmusic WG; 'Colin Perkins'
Subject: Re: [MMUSIC] AD Evaluation of draft-ietf-mmusic-rfc4566bis-32: Media Description

On 2/19/19 1:52 AM, Roni Even (A) wrote:
> Hi Paul,
> I am not sure why we need to  change the definition.
> 
> A media description describes the media and it start with a m= line  
> ... (and so on)
> 
> If want to expand maybe say that it must start with an m= line and 
> will include the sdp types as listed in section 5

This came up because Ben felt that the current definition was inadequate because it is only syntactic. He asked for a semantic definition to be added.

IMO the fact that it seems hard to come up with a suitable semantic definition makes it more important to do so.

	Thanks,
	Paul