I have the same issue - I'm using Freecall as the provider. They allow you to set any registered number (that has been verified) or no callerid. But what I want is to be able to set one of my DIDs as the callerid if I call a specific country and the other one if not. I shoudl be able to so that with OBI100 I thnk, but I gues that Freecall is blocking it. (at the moment I am having a hard time getting the to understan dteh question I am asking, even)