6.1.2 GWCall::callNull State

The application waits in the gateNull state for a GCEV_OFFERED event from the IP. Upon receipt of the event it transfers the event to the IPCallControl module which calls getIncomingCallInfo( ), which in turn calls gc_Extension( ). See Section 6.4.2, "IPCallControl::Null State" for additional information. The call state transitions to callGetIPInfo.

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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