# Define H323 Protocol parameters

The H323 Protocol Agent tracks H.323 connections.

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H.323 consists of a series of different types of standards relating to, for example, video and audio services, real-time transport, control channels and security. The H323 Protocol Agent can allow H.323 traffic through a engine when NAT is used.
Note: T.120 connections, used for instance for file transfer and whiteboard drawing, are not allowed by the H.323 Protocol Agent. To allow T.120, use the H.323 Service Group or the T.120 Service element.

For more details about the product and how to configure features, click Help or press F1.

## Steps

1. In the properties of a custom Service you have created, click Select next to the Protocol field and select H323.
2. On the Protocol Parameters tab, set the parameters for the Protocol.
3. Click OK.