H323 Phone, Port 1719

I have ooh323 up and running with a trunk to another PBX - it works. However, I am attempting to register an Avaya h323 phone to Asterisk and it wants to register on UDP port 1719.

Nmap -Su reveals that Asterisk is not listening on udp/1719.

Is there a way to do this (preferably without interrupting the tcp/1720 that is being used by the trunk)?