Hi, Both the CANCEL and ACK issues that you are facing is because the sent-by value of the Via header in both these requests is different from what was used in INVITE. The issue is with the UAC, UAS is not able to match the requests to an existing server transaction.
Refer section 17.2.3 of rfc 3261 for further details. Thanks, Pranab ________________________________________ From: [email protected] [[email protected]] On Behalf Of Vivek Batra [[email protected]] Sent: Tuesday, January 22, 2013 9:40 AM To: [email protected] Subject: [Sip-implementors] Keep retransmitting 486 Busy... Hi folks, I am facing issue with one specific service provider where UAS is busy and hence sends 486 Busy message, and also get ACK for 486 Busy but UAS somehow couldn't match the ACK transaction and keep retransmitting 486 Busy till timeout. Can you have a look at ACK message below and suggest what is going wrong here. Best Regards, Vivek Batra INVITE sip:[email protected]:5060 SIP/2.0 From: "Anonymous" <sip:[email protected]:5060>;user=phone;tag=ccid-176140755-358439439 Contact: sip:[email protected]:5060 Via: SIP/2.0/UDP 69.132.136.5:5060;branch=z9hG4bK-358439439-1 To: <sip:[email protected]:5060> Call-ID: [email protected] CSeq: 1 INVITE SIP/2.0 486 Busy Here From: "Anonymous"<sip:[email protected]:5060>;tag=ccid-176140755-358439439 ;user=phone To: <sip:[email protected]:5060>;tag=5f9a28-8801a8c0-13c4-50ef98ff-4aa1 46a5-50ef98ff Call-ID: [email protected] CSeq: 1 INVITE Via: SIP/2.0/UDP 69.132.136.5:5060;received=69.132.196.11;branch=z9hG4bK-358439439-1 ACK sip:[email protected]:5060 SIP/2.0 Via: SIP/2.0/UDP 69.132.196.11:5060;branch=z9hG4bK-358439439-1 From: "Anonymous"<sip:[email protected]:5060>;tag=ccid-176140755-358439439 ;user=phone To: <sip:[email protected]:5060>;tag=5f9a28-8801a8c0-13c4-50ef98ff-4aa1 46a5-50ef98ff Call-ID: [email protected] CSeq: 1 ACK SIP/2.0 486 Busy Here (keep retransmitting 486 Busy).. Best Regards, Vivek Batra _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors SASKEN BUSINESS DISCLAIMER: This message may contain confidential, proprietary or legally privileged information. In case you are not the original intended Recipient of the message, you must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message and you are requested to delete it and inform the sender. Any views expressed in this message are those of the individual sender unless otherwise stated. Nothing contained in this message shall be construed as an offer or acceptance of any offer by Sasken Communication Technologies Limited ("Sasken") unless sent with that express intent and with due authority of Sasken. Sasken has taken enough precautions to prevent the spread of viruses. However the company accepts no liability for any damage caused by any virus transmitted by this email. Read Disclaimer at http://www.sasken.com/extras/mail_disclaimer.html _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
