Hello! I have a some problems with sip phone registration. Our topology: Cisco 7911 SIP ----- Internet ---- Public SIP server. I analyzed traffic with Wireshark. Cisco phone send SIP Register, then Public SIP server response with SIP 401 Unauthortized with WWW-Authenticate. But my cisco phone do not send SIP Register with WWW-Authenticate again. Why ? I attached config file of cisco phone. Please, help me!
