NCC events and call states

The following table specifies standard NCC events that the application can expect to receive for a call when the call is in a particular call state. Other protocol-specific NCC events may be reported in most states. See the protocol-specific documentation for details.

Events marked with an asterisk (*) can occur in the indicated states if the NCC_CAP_HOLD_IN_ANY_STATE bit is set in the capabilitymask returned by nccQueryCapability.

NCC event

NCC call state

Accepting

Answering

Connected

Disconnected

Incoming

Outbound
initiated

Placing

Proceeding

Receiving digits

Rejecting

Seizure

NCCEVN_ACCEPTING_CALL

 

 

 

 

X

 

 

 

X

 

 

NCCEVN_ANSWERING_CALL

X

 

 

 

X

 

 

 

X

 

 

NCCEVN_BILLING_INDICATION

 

 

X

 

 

X

X

X

 

 

 

NCCEVN_BILLING_SET

 

 

 

 

X

 

 

 

 

 

 

NCCEVN_CALL_CONNECTED

 

X

 

 

 

 

X

X

 

 

 

NCCEVN_CALL_DISCONNECTED

X

X

X

 

X

X

X

X

X

X

X

NCCEVN_CALL_HELD (*)

X *

X *

X

X *

X *

 

X *

X *

X *

X *

X *

NCCEVN_CALL_PROCEEDING

 

 

 

 

 

 

X

 

 

 

 

NCCEVN_CALL_RELEASED

 

 

 

X

 

X

 

 

 

 

 

NCCEVN_CALL_RETRIEVED (*)

X *

X *

X

X *

X *

 

X *

X *

X *

X *

X *

NCCEVN_CALL_STATUS_UPDATE

X

X

X

X

X

X

X

X

X

X

X

NCCEVN_CALLID_AVAILABLE

X

X

X

X

X

X

X

X

X

X

X

NCCEVN_EXTENDED_CALL_
STATUS_UPDATE

X

X

X

X

X

X

X

X

X

X

X

NCCEVN_HOLD_REJECTED (*)

X *

X *

X

X *

X *

 

X *

X *

X *

X *

X *

NCCEVN_INCOMING_CALL

 

 

 

 

 

 

 

 

X

 

X

NCCEVN_PLACING_CALL

 

 

 

 

 

X

 

 

 

 

 

NCCEVN_PROTOCOL_ERROR

X

X

X

X

X

X

X

X

X

X

X

NCCEVN_PROTOCOL_EVENT

X

X

X

X

X

X

X

X

X

X

X

NCCEVN_RECEIVED_DIGIT

 

 

 

 

 

 

 

 

X

 

X

NCCEVN_REJECTING_CALL

X

 

 

 

X

 

 

 

X

 

 

NCCEVN_REMOTE_ALERTING

 

 

X

 

 

 

 

X

 

 

 

NCCEVN_REMOTE_ANSWERED

 

 

X

 

 

 

 

X

 

 

 

NCCEVN_RETRIEVE_REJECTED (*)

X *

X *

X

X *

X *

 

X *

X *

X *

X *

X *