Chapter 15-Gateway Calls

During the connection phase, the number being dialed is displayed on the screen of the calling endpoint.

If the call is not answered or it cannot be completed using one communication protocol, the system will try to connect the endpoint using the next communication protocol according to the selected protocols in the following order: H.323, SIP and ISDN. PSTN numbers are identified separately and are dialed immediately without trying other connections.

If the call is busy, the system will not try to connect the endpoint using another protocol.

If the call is not completed after trying all possible protocols, the system displays the number that was dialed on the calling endpoint’s screen and the reason for not completing the call. For details, see "Connection Indications” on page 15-9.

When the call is connected, a new Gateway Session is created and added to the ongoing Conferences list.

Dialing from H.323 Endpoints

Figure 15-1Dialing String and Call Flow from H.323 Endpoint to One, Two or Three Endpoints

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Polycom 2000/4000 manual Dialing from H.323 Endpoints, 15-2