this is how we do it.
30000-300032 UDP to the OAS card (when set to MGI) as that carries the voice.
9000-9001 UDP
6000-6001 UDP
6100 tcp
the last three ports go to the systems IP. we have come across where some routers/system doesn't like the port forward being set to both tcp/udp (not sure why but setting it to only whats needed works)
hope that helps you.

(first post smile )

Last edited by Scorpion; 04/28/14 11:29 AM. Reason: spelling