I am having an issue with SIP Trunking. The topology of my network is the UC520 sitting behind an SR520ADSL router. The connections section of the SIP packet is showing the FA0/0 port on the UC520 (10.201.14.34). NAT is verified and working with the correct translations, port 5060. I have tried using the: CommRTR(conf-serv-sip)#bind all source-interface interface. I have set this to a loopback which is configured with the public address. The binding information appears correctly under sip-ua. However, registration with the registrar server goes down. When binding is not configured, the call is connected but audio is dropped in both directions.
I am new to SIP, so my question is: Does anyone know how to bind my public address to the "connection" section inside the packet. I'm not sure if I'm pointed in the right direction.
Thanks for your help. Regards...Matt