I'm using your program Zoiper IAX SIP VOIP Softphone.
This program is connecting to my VOIP server.
Also i'm taking log from my VOIP server to log server.
Yestarday I notice that ip 188.8.131.52 is brute forsing my server by changing CallerID.
When it come to my CallerID it's connected.
I think that this IP addres is YOURS.
Is this really your IP address?
And if this really your IP, why your program so works?