Hi I have 2 SIP networks with 2 SERs like on this diagramm:

UA1---------SER1-----------SER----------UA2

I authenticate all UAs and all calls (local, long distance and international) on both SERs. How can I relay the call from UA1 to UA2 ? If for example UA1 has local privileges, is there a posibility to relay the call to UA2 without any more authentication? There is an error 407 (Proxy Authentication Required).

Thank you in advance.

Szasz Szabolcs