Dynamic H.245 Stage for Outgoing Calls

This section describes what happens when a message exits the Oracle® Enterprise Session Border Controller on an H.323 stack that you have configured for dynamic H.245 stage support.

When the Oracle® Enterprise Session Border Controller receives the first H.225/Q.931 message that has H.245 address information, it establishes an H.245 channel. The Oracle® Enterprise Session Border Controller initiates a TCP connection to the address and port specified in the H.245 address information.

If the incoming call for the session is also on an H.323 stack with dynamic H.245 configured, the Oracle® Enterprise Session Border Controller starts the H.245 procedure in the incoming call. Otherwise, the system sends its H.245 address in the incoming call based on the H.245 stage support that you have configured.

The process is different when the Oracle® Enterprise Session Border Controller receives a TCS message on the outgoing call before the incoming call reaches its H.245 stage. In this instance, the Oracle® Enterprise Session Border Controller sends a Facility message with the reason startH245 with its H.245 address in order to start the H.245 procedure. The reason is needed in order for the Oracle® Enterprise Session Border Controller to exchange TCS messages with the incoming side of the call.