El Friday 26 October 2007 14:27:36 Aymeric Moizard escribió:
First: from rfc: "the To tag of the response to the CANCEL and the To tag in the response to the original request SHOULD be the same"
-> Thus, there is no reason to send the tag from a provisionnal response in the CANCEL answer. THIS IS ONLY FOR FINAL RESPONSE (the 487), never PROVISIONNAL (180 or 183). (However, the tag is always the same on endpoints, but still this is not true on proxy). That's how I understand it.
-> SHOULD means that it's not mandatory. So if one application like asterisk tries to match the To tag of CANCEL answer and the to tag of a final response then this application is NOT compliant to rfc3261.
Thanks, in Sip-implementators mailist I got a similar response:
https://lists.cs.columbia.edu/pipermail/sip-implementors/2007-October/017685...
I thisnk all is clear :)
Thanks a lot.