The release notes for m100 indicate a few random ports are used for certain protocols. (See page 21) Our network firewall appliance requires a set port allotment, and our security protocols do not allow for an open machine. We also would like to use this telepresence m100 on multipe machines, so a DMZ isn't an option either. Is there a way to assign a port to H.225.* and H245, and probably binary flow control. Maybe the Dialing Scheme too, but I'm happy to try one at a time.
The simple answer is that it’s random.
Have you tried upgrading to the latest m100 software 1.0.5? There is a fix for receiving calls when behing a NAT.