6.2.2 GWCall::callNull State

The application waits in the gateNull state for an GCEV_OFFERED event from the PSTN. Upon receipt of the event, the application sets the remote phone number for making the call by calling getDestAddr( ) from the PSTNCallControl module. It then calls processEvent(USR_MAKECALL) from the IPCallControl module. The application routes the call and the call state transitions to callPSTNOffered.

If the application receives a GCEV_DETECTED event, the call state transitions to callPSTNDetected.

If the application receives a GCEV_DISCONNECTED event, it sets the drop reason by calling getResultValue( ) from the GCCallControl module. The application then calls processEvent(USR_DISCONNECT) from the IPCallControl module if the PSTN was the event source, or from the PSTNCallControl module if the IP was the event source. The call state transitions to callDropping.

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