> -----Original Message-----
> From: Adam Roach [mailto:[EMAIL PROTECTED]
> Sent: Monday, November 17, 2008 9:12 AM
>
> On 11/17/08 7:40 AM, Hadriel Kaplan wrote:
> > Or you could pick something else to use for verification.
>
> Such as...?

Either a new header or a new parameter.  We seem to be getting this requirement 
a lot lately in various SIP-related WG's: we need some unique per-call 
identifier thingy that crosses b2bua's without change.  I propose we just 
standardize one, but avoid making it have any property which made changing 
call-id value's a necessity. (like don't put addressing info in it, and don't 
make it a dialog match criteria in the state machine, etc.)  I was planning to 
submit a draft to do that before the deadline, but was too busy.

It would require the UA's to change to support it if you want to use it for 
Derive, but somehow I don't really believe a significant market share of 
deployed UA's support the rfc4235 subscribe dialog-package yet either (despite 
Sipit's poll).  And I think we'd have uses for a logical call-id not in Call-ID.

-hadriel
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