Please it is urgent. I have a call manager express natted to a real IP. This real IP is used by users from other remote sites (in Dubai), in order to register to the CCME and call our extensions in Beirut. The IP phones (IP communicator) are registering, and are able to call each other(the phones are ringing), but we can't hear each other when we answer the calls, no voice is heard.
Please advice urgently (maybe it is ports problem or ... ???!!)