Quote Originally Posted by traud View Post
N85-User, in VoIP 3.x the realm is not important as it was in 2.x because now the realm is received (and re-used) from the first response of your server. Here in this thread, you have to patch your registrar/proxy (not to touch the contact header field) or place another proxy in between as Simon described. However, whether that hash in the contact header is the cause of your problem, should be checked with a packet analyser beforehand.
We used WireShark for listen the Switch between the PBX and the phone and, appear that the problem was in the mobile that receive the response in other port (5060).