Well I can answer my own question now. yes it works just fine. Setup Axom to use the gateway as the Asterisk box, and setup Asterisk to register it as a sip phone. Registered right up and placed calls to and from my pri services. (yes I'd like to use a VOIP provider but I'm still under a long contract that I can't get out of so I'm stuck with PRI service for a few years :\ )