Come across an issue with the IPCortex and Tipicall SIP where the call sets up fine but drops after about 10 seconds. From a Wireshark I think that the issue is where the internal IP address(192.168.1.211) of the IPCortex is listed in the Contact URI of the Message header ->
Contact: sip:01603964312@192.168.1.211:5060
Contact URI: sip:01603964312@192.168.1.211:5060
Contact URI User Part: 01603964312
Contact URI Host Part: 192.168.1.211
Contact URI Host Port: 5060
which the SBC then uses as the return address but can’t route to it so the call is dropped due to timeout. I have confirmed this with Tipicall.
Do you know/can you find out where this Contact URI information for the SIP packet construction is located so that we can modify to get this working ok?