asterisk users - Sep 2014 - Channel h323 and oh323 fails to match inbound IP

I am having the issue described in this question:
http://lists.digium.com/pipermail/asterisk-users/2005-May/099075.html

Does anybody has an insight? I guess Asterisk is trying to match the
combination IP:Port, but in H223 this changes call by call. There is
no way to add "insecure=port" like in channel_sip.