Messenger 6

Hi! I have been using gnugk to manage h323 through a gatekeeper/proxy, but I am not able to work it out with the new messenger. I am natting a 10.0.0.0/24 network, and some users *want* to use only the newest messenger, that I was not able to configure to detect or use the gatekeeper.... Has anyone found a solution? Either conntrack, proxy or whatever? Regards. Ariel