RE: [MEDIACTRL] FW: I-DACTION:draft-boulton-mmusic-sdp-control-package-attribute-00.txt

Hi, Chris
	I'm glad to read this draft. You provide a method to negotiate
control packages by SDP, and define the SDP attribute of control packages. I
think you maybe missing some handle about UAC and UAS.
1、Before sending SDP offer, how does UAC know which control packages UAS
supports;

[Chris Boulton] This is out of the scope of this document + out of scope of the core SIP Control Framework.  We currently have an MRB draft which I am working on (http://www.ietf.org/internet-drafts/draft-boulton-mediactrl-mrb-00.txt) and I can also see potential for other mechanisms to discover package support.

2、If UAC wish some control packages but UAS can not support all or part,
what to do by UAC.
For example, UAC send SDP offer containing control packages A, B, C, UAS
return SDP answer containing control packages B,C.

[Chris Boulton] That is the purpose of this attribute.  A UAC might say 'hey - the UAS can't support A but lets carry on' OR it might say 'I can't continue without A so lets call so lets give up'.  This doc is intended to give both sides a hint as to what it initially supported so that they can make implementation specific choices.

Chris.

Xiao
> -----Original Message-----
> From: Chris Boulton [mailto:cboulton@avaya.com]
> Sent: Wednesday, November 14, 2007 5:18 PM
> To: mediactrl@ietf.org
> Subject: [MEDIACTRL] FW:
> I-DACTION:draft-boulton-mmusic-sdp-control-package-attribute-00.txt
>
> All,
>
> As discussed at length on the MEDIACTRL mailing list, I have submitted a
> draft on using an SDP attribute as a hint to Control Packages that can
> potentially be used in a Control Framework session (submitted to
> MMUSIC).  It's a '00' so it's a bit rough around the edges, take a look
> and let me know what you think.
>
> Chris.
>
>
> -----Original Message-----
> From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org]
> Sent: 13 November 2007 19:15
> To: i-d-announce@ietf.org
> Subject: I-D
> ACTION:draft-boulton-mmusic-sdp-control-package-attribute-00.txt
>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>
>
> 	Title		: A Session Description Protocol (SDP) Control
> Package Attribute
> 	Author(s)	: C. Boulton
> 	Filename	:
> draft-boulton-mmusic-sdp-control-package-attribute-00.txt
> 	Pages		: 13
> 	Date		: 2007-11-13
>
>    This document defines a new Session Description Protocol (SDP) media-
>    level attribute: "ctrl-package".  The "ctrl-package" attribute
>    conveys details of the SIP Control Framework extension packages that
>    are supported by a client participating in an offer/answer exchange.
>
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-boulton-mmusic-sdp-control-pac
> kage-attribute-00.txt
>
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