Understanding MGCP ALG Unknown Message Types

To accommodate on-going development of the Media Gateway Control Protocol (MGCP), you might want to allow traffic containing new MGCP message types. The unknown MGCP message type feature enables you to configure the Juniper Networks device to accept MGCP traffic containing unknown message types in both Network Address Translation (NAT) mode and route mode.

This feature enables you to specify how unidentified MGCP messages are handled by the Juniper Networks device. The default is to drop unknown (unsupported) messages. Unknown messages can compromise security. However, in a secure test or production environment, this command can be useful for resolving interoperability issues with disparate vendor equipment. Permitting unknown MGCP messages can help you get your network operational so that you can later analyze your voice-over-IP (VoIP) traffic to determine why some messages were being dropped.

Note that this command 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 and you have configured the device to permit unknown message types, the message is forwarded without processing.

Understanding MGCP ALG Unknown Message Types

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