I see in RFC 3261 saction 17.1.1.3, titled "Construction of the ACK Request". Have you carefully checked your ACK against its specifications?
In regard to the example you provide, the 408 response has no to-tag, which is quite strange for any modern SIP device. Dale _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
