Please get a debug log of the call and put in
pastebin.freeswitch.org. Also, put a copy of the dialplan in pastebin.
If all else fails, go back to the default configuration and start fresh. Make sure the default configuration works, then slowly add your changes. Start with something simple like pointing your DID at x1000 (ring a user) or maybe x3000 (ring a conference room). Then create a new extension for your DID and have it do something simple like an echo test. Make sure that works before you try bigger things like scripts.
-MSC