If I use VoipBuster directly from my Siemens 450IP then I call someone, he can see my caller Id. If I use VoipBuster via my 3cx server, 3cx can register into VoipBuster, so I can call, but nobody can see my user ID. I think I know why : If I register from S450IP, I must enter my phonenumber like "+33412345678" and I don't do that, my caller id is not shown. But when I enter voip provider parameters in 3CX, I can only enter my external number like "0412345678" : "+33412345678" is rejected. Is there a workaround ? Thank's.