6.2.2 GWCall::gateNull State

The application waits for a GCEV_OFFERED or GCEV_DETECTED event. In the case of GCEV_DETECTED, the application calls processEvent(GCEV_DETECTED) from the PSTNCallControl module and the call state transitions to gateDetectedFromPSTN. See Section 6.5, "PSTNCallControl State Machine" for a description of the PSTNCallControl state machine.

In the case of GCEV_OFFERED, the application calls processEvent(GCEV_OFFERED) from the PSTNCallControl module and calls getLocalMediaInfo( ) from the IPMediaDevice to get the local media information. The call state transitions to gateOfferingFromPSTN.

The application may also receive an IPEV_OFFERED event. See Section 6.1, "GWCall State Machine - Inbound Call from IP" for a description of how the application deals with these events.

If either the PSTNCallControl module or the IPMediaDevice module return NULL, the application calls the function sendDropCall(BUSY), which sends a dropCall message to the remote side through the IP call control stack.

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