> If a UA uses different dialog-ID (say new Call-ID & No To > header tag) for REGISTER refresh with same contact > address then it is allowed?
Yes; however you should read RFC 3261 section 10. For instance, section 10.2.4 indicates "UA SHOULD use the same Call-ID for all registrations during a single boot cycle" and section 10.2 indicates that using the same Call-ID helps detect a delayed REGISTER. > In general does REGISTER refresh & REGISTER for deregistration > MUST be in same dialog as earlier REGISTER? No. As RFC 3261 section 10.2 indicates "REGISTER request does not establish a dialog". REGISTER creates what some call a pseudo dialog since Call-ID should be reused but the refresh/deregister does not contain a To tag. _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
