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Configuring the H.323 ALG—Quick Configuration

You can use J-Web Quick Configuration to quickly configure H.323 ALG Parameters.

To configure the H.323 ALG with Quick Configuration:

  1. In the J-Web user interface, select Configuration > Quick Configuration > ALG > VoIP ALG.

    The figure below shows the H.323 ALG page.

    Figure 76: H.323 ALG Configuration

    H.323 ALG Configuration

  2. Select the H.323 tab if it is not selected.
  3. Fill in the parameter settings as described in the table below and click one of the following buttons:




Enable H323 ALG

Enable or disable the H.323 ALG

Click the check box.

Endpoint Registration Timeout

Controls how long entries remain in the NAT table.

Enter a value between 10 and 50,000 seconds.

Media Source Port Any

Allows media traffic from any port number. By default, this feature is disabled. When disabled, the Services Router allows a temporary opening, or pinhole, in the firewall as needed for media traffic.

Enter a value between 1 and 50,000 seconds.

Message Flood Gatekeeper Threshold

Limits the rate per second at which remote access server (RAS) requests to the gatekeeper are processed. Messages exceeding the threshold are dropped. This feature is disabled by default.

Enter a value

Permit NAT Applied Unknown Message

Specifies how unidentified H.323 messages are handled by the router. The default is to drop unknown (unsupported) 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 (unsupported) 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.

Click the check box.

Permit Routed Unknown Message

Specifies that unknown messages be allowed to pass if the session is in Route mode. (Sessions in Transparent mode are treated as Route mode.)

Click the check box.

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