6.1.2 GWCall::gateNull State

The application waits in the gateNull state for an IPEV_OFFERED event (from IPCallControl). Upon receipt of the event, the application calls processEvent(CCEV_OFFERED) from the PSTNCallControl module. See Section 6.5, "PSTNCallControl State Machine" for a description of the PSTNCallControl state machine. The application then calls the function getLocalMediaInfo( ) from the IPMediaDevice module. See Section 6.4, "IPMediaDevice State Machine" for a description of the IPMediaDevice state machine.

The state transitions to gateOfferingFromIP.

The application may also receive a GCEV_DETECTED or GCEV_OFFERED event. See Section 6.2, "GW Call State Machine - Inbound Call from PSTN" 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 drop call message to the remote side through the IP call control stack.

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