Klaus Darilion wrte:
allow in dialogue INVITE with to tag.
for example: A calls B. B forwards the call to C. If C sends the BYE, this will be loose route, but the From: header contains domain B, the To: header contains domain A, and the domin in the request URI contains the IP address of A. Thus, if you will check for domain C it will fail.
See the key words "in dialogue INVITE". I was trying to address one particular SIP method here. I did mentioned to check other method as well. Besides, there was no mentioning of uri check here, just to tag!