Hi RFC 3261 is pretty clear on this. Server should ignore the additional parameters in the Via header and should not send a 481.
Regards, Tarun Gupta Aricent -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, March 07, 2012 9:49 AM To: [email protected] Subject: [Sip-implementors] Reg via header in CANCEL request Hello all, A client sends an INVITE with the following top via header "Via: SIP/2.0/UDP 10.223.96.4:5060;branch=z9hG4bKrhhclcinkkir2kgrgfrljgcjk;X-example=1009" The client sends a CANCEL request to cancel the INVITE with the following via header "Via: SIP/2.0/UDP 10.223.96.4:5060;branch=z9hG4bKrhhclcinkkir2kgrgfrljgcjk" The server replies with response 481 Call Leg/Transaction Does not Exist. Is it right on the part of the server to reject the CANCEL. When we read sec 9.1 of RFC 3261 in isolation the behavior of the server seems to be right ("CANCEL constructed by a client MUST have only a single Via header field value matching the top Via value in the request being cancelled."). But when read along with section 9.2/17.2.3 it can be seen that the server needs to match only the sent-by value and the branch parameter to find the transaction to be cancelled. Any other parameter is not required to match the transaction. Kindly clarify whether sending of 481 by server in this case is correct or not? Regards, Rajangam Please do not print this email unless it is absolutely necessary. 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 [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors =============================================================================== Please refer to http://www.aricent.com/legal/email_disclaimer.html for important disclosures regarding this electronic communication. =============================================================================== _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
