I have a Panasonic VoIP phone behind NAT. It is connected to 2talk. I am getting repeated nuisance phantom calls with callerid "admin123". These calls do not show at 2talk so I assume it's some sort of internet war dialer.
I also have a Snom VoIP phone plugged into the same network but it does not experience this problem.
Can someone shed some light on this issue and what setting(s) need to be changed?