# FGD and NCC service call control

When an application performs natural call control with the FGD protocol, after the application receives an NCCEVN_INCOMING_CALL event, it can invoke nccGetCallStatus to retrieve the following information within the NCC_CALL_STATUS structure:

Field | Description
--- | ---
calledaddr | The called number. Also referred to as the direct inward dial (DID) number.
callingaddr | The calling number (if available). Also referred to as the automatic number identification (ANI) number.

The following field is in the NCC_CAS_EXT_CALL_STATUS structure:

Field | Description
--- | ---
carrierid | Carrier ID information (if available).

With FGD, all digits are MFs; no DTMF signaling is used. By default, a group of incoming digits begins with a KP tone, followed by digits, then an ST tone. This may be followed by a wink, then perhaps one or more other KP-digits-ST-wink sequences.