Re: [MMUSIC] I-D ACTION:draft-ietf-mmusic-sdp-media-content-04.txt

On 11 Jul 2006, at 20:50, Internet-Drafts@ietf.org wrote:
> A New Internet-Draft is available from the on-line Internet-Drafts  
> directories.
> This draft is a work item of the Multiparty Multimedia Session  
> Control Working Group of the IETF.
>
> 	Title		: The SDP (Session Description Protocol) Content Attribute
> 	Author(s)	: J. Hautakorpi, G. Camarillo
> 	Filename	: draft-ietf-mmusic-sdp-media-content-04.txt
> 	Pages		: 12
> 	Date		: 2006-7-11
> 	
> This document defines a new Session Description Protocol (SDP) media-
> level attribute, 'content'.  The 'content' attribute defines the
> content of the media stream in more detailed level than the media
> description line.  The sender of an SDP session description can
> attach the 'content' attribute to one or more media streams.  The
> receiving application can then treat each media stream differently
> (e.g., show it on a big screen or small screen) based on its content.
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-mmusic-sdp-media- 
> content-04.txt

The new text in this draft about txp states "This indicates that the  
media stream is originated from a textphone that is incapable of  
handling simultaneous two-way communication". I don't think that's  
appropriate: the draft is not about defining device capabilities, nor  
is it about requiring special behaviour from a device that receives  
these attributes.

As I have stated before, if there is a need to negotiate special  
behaviour for a text phone device, then an appropriate SDP attribute  
should be defined, with the appropriate semantics and well-defined  
offer/answer behaviour. A sub-parameter of "a=content:" is not the  
right place, however.

Colin

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