I have found a strange bug in the ZyXEL 2602HW (firmware "V3.40(MV.3)") that make it impossible to use it to make calls: the Request URI of the ACK and BYE messages is addressed to the SIP server ("sip:195.120.250.50") instead of the other UA (i.e. something like "sip:123@1.2.3.4").
I cannot understand how such an huge bug is not experienced by somebody else.
Anybody had the same problem with the 2602HW?
Thanks.