Out of range sip peer extension port assignment

I just installed a fresh copy of PBX in a Flash. I have notices that all my extensions are getting assigned very high port numbers outside the 10000-20000 range. The port number are in the rage of 50000-65000.

I have the PIAF behind a netgear router with 10000-20000 UDP forwarded to the server. So no in coming call is making it to the PAIF.

How can I change this port assignment.

Any help would be appreciated.