1.3. Basic H.323 Call Scenario

A simple H.323 call scenario can be described in five phases:

• Call Setup
• Capability Exchange
• Call Initiation
• Data Exchange
• Call Termination

Calls between two endpoints can be either direct or routed via a gatekeeper. This scenario describes a direct connection where each endpoint is a point of entry and exit of a media flow.

The example in this section describes the procedure for placing a call between two endpoints A and B, each with an IP address on the same subnet.

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