Re: Comments on draft-loreto-sipping-context-id-requirements-00

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On Tue, 2008-12-09 at 15:42 -0500, Dale Worley wrote:
> On Tue, 2008-12-09 at 09:41 -0500, Paul Kyzivat wrote:
> > Well, since the draft only talks about correlating dialogs, the issue 
> > with MESSAGE only comes when using MESSAGE in-dialog.
> > 
> > While it isn't *forbidden* to use MESSAGE in a dialog, that technique 
> > was rejected by the WG for session mode IM. Also, the last I knew, at 
> > least Microsoft's use of MESSAGE in-dialog also used a special m-line in 
> > SDP to negotiate doing so.
> > 
> > Establishing a dialog without media, to be used for exchanging MESSAGE 
> > hasn't been formally defined. It would be problematic - some kind of 
> > signaling would be needed to indicate that the intent is to exchange 
> > MESSAGEs. If you have that, then it could probably be used to combine 
> > the media. Certainly if you have a dialog with no media you can make 
> > another offer to add voice or video.
> 
> But if you tagged each of a long series of out-of-dialog MESSAGE
> requests with the same context-id, they'd all get displayed in the same
> communication context at the recipient, even if each MESSAGE had a
> unique call-id.  (In this, I'm modeling such a MESSAGE as "a dialog of
> one request", which I think is more or less implicit in SIP.)

Ah, yes...  In the -01 version, since you can't correlate a dialog with
a dialog that is terminated, you can't use the trick of forcing each
MESSAGE to be correlated with each other MESSAGE, since their "dialogs"
last only an instant.

Dale


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