It seems like this is not working at present. I have no problem call nationally...but as soon as I want to make an international call, I just can't get a line. I checked the call details and there I can find some of those calls wit "No Answer". Checking my AVM Fritz!Box, where the asterisk is registered as a sipphone- none of those calls show up.
I put a "0" as a dial prefix in the Webadmin, so any international call would have to start with "000". I don't even get a message about a wrong number, so I guess the formatting is okay.
Does anyone have an idea what could cause this?