Nokia E51 not completing certain destinations
 

This is a very weird Problem. I have 12voip registered for outbound calls on voxalot and register myself using a Nokia E51.

Well, when I call destinations like Austria I have no problem at all, but when calling Brazil it will ring and I get disconnected just after the person accepted the call on the other side of the line.

Maybe it is a Nokia bug, since this problem only shows when using my 3G connection. Over Wifi everything will work fine. Nevertheless I would like to know if there is a way to counterfeit it.

Thanks a lot!

My Userid: 650650

ps. Optimize audio path is off and NAT Handling too. Changing those seem to have no effect, but I could try again.