Enable Permit NAT Applied鈥擲elect the check box to specify how unidentified H.323 (unsupported) messages are handled by the device.

The default is to drop unknown messages. Permitting unknown messages can compromise security and is not recommended. However, in a secure test or production environment, this statement can be useful for resolving interoperability issues with disparate vendor equipment. By permitting unknown H.323 messages, you can get your network operational and later analyze your VoIP traffic to determine why some messages were being dropped.

This statement applies only to received packets identified as supported VoIP packets. If a packet cannot be identified, it is always dropped. If a packet is identified as a supported protocol, the message is forwarded without processing.

Enable Permit Routed鈥擲elect the check box to specify that unknown messages be allowed to pass if the session is in route mode.

Sessions in transparent mode are treated as though they are in route mode.