Establishing connections

The application initiates a circuit switched connection by invoking ISUPConnectReq resulting in the generation of an ISUP initial address message (IAM) to the far exchange. Alternatively, the far exchange can initiate the connection by sending the IAM message. The application receives a connect indication (EVTSITCONIND) event.

The following illustration shows the functions and events used to establish an outgoing connection:

During the connection establishment phase, the application exchanges call progress and other status information with the far exchange by invoking ISUPConnectStatusReq with an event type and by receiving ISUP connect status indication (EVTSITCNSTIND) events from the ISUP task.

The following illustration shows the functions and events used to establish an incoming connection:

The connection establishment phase ends when one of the following events occur: