I finally setup unity to call a number for notification.
It calls correct and the prompts for the ID (please enter your ID or press "1" to disable notifications on this line), but no matter what I enter (tried PIN with and without # or directory number), it continious asks for the ID and hangs up after a while.
Am I missing something?
Sounds like DTMF may not be making it to Unity. Take a quick look at this document explaining a dial-peer configuration that you may need to adjust on your GW:
Hope that helps,