When a caller cancels a call, OpenSIPS will send the 487 response sent from the callee to the caller. However, in the case of SIP forking, I find that OpenSIPS will not send the 487 response to the caller after the caller cancels the call. Do I need any particular configuration for the SIP forking case? Any comment is appreciated.
It turns out that this issue is a bug on our own clients (which have correct Vias in the 1-on-1 calls, but have problems in the SIP forking case). OpenSIPS has the contents of SIP messages totally correct. Thanks for your reply.