RE: [Sip] NOTIFY establishes a dialog

[hisham.khartabil@nokia.com]

I have a few related questions/comments:

- A 180 response to a request (like INVITE) establishes a dialog. This 180 response carries record-route headers and therefore sets the route-set. The 200 response to the request might also carry record-route headers. The dialog transitions to confirmed state, but I assume the route-set does not get updated using the record-route headers in the 200 response since the dialog is established already. Is this a correct assumption? should the UAS send record-route headers at all in the 200 if it sent a 1xx already?

Should there be a mandate that 1xx and 2xx response carry the same record-route headers? You would assume that this happens naturally at the UAS, but proxies may play around with the record-route headers.

- In the NOTIFY problem below, the NOTIFY establishes the dialog, but does not carry record-route headers. If the same assumption is made as above, the record-route headers appearing in the 200 response to the SUBSCRIBE are ignored since the dialog is in established state. Isn't this a problem? the route-set is lost.

I appreciate some clarifications.

Regards,
Hisham


> -----Original Message-----
> From: ext hisham.khartabil@nokia.com 
> [mailto:hisham.khartabil@nokia.com]
> Sent: Wednesday, March 12, 2003 5:37 PM
> To: sip@ietf.org
> Subject: [Sip] NOTIFY establishes a dialog
> 
> 
> In RFC3265, it is mentioned that NOTIFY can certainly 
> establish a dialog if it arrives before the 200 of a 
> SUBSCRIBE. What happens when the 200 for the SUBSCRIBE now 
> arrives with record-route headers? Does the route-set get 
> updated? (keeping in mind that the dialog is now in the 
> established state).
> 
> Regards,
> Hisham
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> 
_______________________________________________
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This list is for NEW development of the core SIP Protocol
Use sip-implementors@cs.columbia.edu for questions on current sip
Use sipping@ietf.org for new developments on the application of sip