A2billing Callback small Fixes (PHP / AGI)

I have a running setup of a2billing, and got callthrough/VoIP working fine. But i have a small problem with ani Callback (webcallback is not needed), it seems to me like a problem because of the way my callerids are setup. Authentication works fine, so the account is found and valid. Although i have tried to fix the problem myself, i am no agi expert so i could not figure it out. The agi debug is showing the numbers and everything seems to be fine (rates/callerid/prefixes..) but the rateengine does not find a correct rate/route for this call. "There is no route to call back your phonenumber" This should be a very easy and quick job for someone with a2billing experience.