CANCEL and ACK for non-2xx responses will have the same branch id as the INVITE so they won't have a unique branch-id whereas INVITE and other requests will always have unique branch ids. I don't see a contradiction in the text.
Serhad -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of vinodh kumar Sent: Wednesday, November 21, 2007 6:51 PM To: sip-implementors@lists.cs.columbia.edu Subject: [Sip-implementors] Branch param for CANCEL message Hi all, I have a query regarding branch parameter in via tag. RFC says The branch parameter value MUST be unique across space and time for all requests sent by the UA. The exceptions to this rule are CANCEL and ACK for non-2xx responses. As discussed below, a CANCEL request will have the same value of the branch parameter as the request it cancels. As discussed in Section 17.1.1.3, an ACK for a non-2xx response will also have the same branch ID as the INVITE whose response it acknowledges. I am bit confused about the statement. It says CANCL and ACK are exception for the rule Branch parameter must be unique. But in next line it says CANCL request will have same branch parameter as that of request it cancels. Whats the conclusion on this. Please clarify. Regards, Vinodh The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
