Section 9.2 says that the To tag in a response to a CANCEL should be the same than the To tag in the response to the original request.
My understanding is that this rule only applies to an UAS, and not to a proxy, as a proxy can send multiple responses with different To tags.
Section 16.10 seems to support this, as it says that "[...] the element is acting as a user agent server as defined in Section 8.2." No words about reusing a previous To tag.
So my question is: Is this call-flow correct?
UAC Proxy | INVITE | |-------------->| | | | 100 tag=null | |<--------------| | | | 180 tag=a | |<--------------| | | | 180 tag=c | |<--------------| | | | CANCEL | |-------------->| | | | 200 tag=d | |<--------------| | | | 487 tag=a | |<--------------| | | | ACK | |-------------->| | |
P.S.: The Bugzilla database at http://www.sipwg.org/sipwg/query.cgi seems to be down.
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