If the request is a retry of a previous request that was responded to with a 4xx status code, it SHOULD be higher than the number used in the previous attempt.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of ext radhakrishna Sent: Wednesday, July 14, 2010 3:31 AM To: [email protected] Subject: [Sip-implementors] How sip stack can recover from the followingerror condition..... Dear All, I want to know if there is any way to come out of the following problem. UAC UAS ----------------------------INV (CSEQ: 1) ------------------------> <---------------------------200 OK---------------------------------- ----------------------------ACK ------------------------------------> Attacker ----------------Update (CSEQ: 10000) ----------> <------------------- 401/407 ------------------------------ -----------------------UPDATE (CSEQ: 2) ------------------> <----------------------- 500 -------------------------------------- Now since the actual UAC is not aware of the attacker, he will keep incrementing the CSEQ every time and will try to send the request. The request would be successful only after trying for some 9999 times. How do we overcome this kind of situation? We suggest that RFC should have a way to convey the CSEQ value stored by UAS in 500 response message so that UAC can come out of the loop. Can anyone please share your opinion on this issue? Regards, RadhaKrishna _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
