LINE_CALLINFO message

The TAPI LINE_CALLINFO message is sent when the call information about the specified call has changed. The application can invoke lineGetCallInfo to determine the current call information.

Parameters

hDevice

A handle to the call.

dwCallbackInstance

The callback instance supplied when opening the call's line.

dwParam1

The call information item that has changed. Can be one or more of the LINECALLINFOSTATE_ constants.

dwParam2

Unused.

dwParam3

Unused.

Return value

No return value.

Remarks

A LINE_CALLINFO message with a NumOwnersIncr, NumOwnersDecr, and/or NumMonitorsChanged indication is sent to applications that already have a handle for the call. This can be the result of another application changing ownership or monitorship to a call with lineOpen, lineClose, lineShutdown, lineSetCallPrivilege, lineGetNewCalls, and lineGetConfRelatedCalls.

These LINE_CALLINFO messages are not sent when a notification of a new call is provided in a LINE_CALLSTATE message, because the call information already reflects the correct number of owners and monitors at the time the LINE_CALLSTATE messages are sent. LINE_CALLINFO messages are also suppressed in the case where a call is offered by TAPI to monitors through the LINECALLSTATE_UNKNOWN mechanism.

Note

The application that causes a change in the number of owners or monitors (for example, by invoking lineDeallocateCall or lineSetCallPrivilege) does not itself receive a message indicating that the change has been done.

No LINE_CALLINFO messages are sent for a call after the call has entered the idle state. Specifically, changes in the number of owners and monitors are not reported as applications deallocate their handles for the idle call.

Requirements

Requirement	Value
TAPI version	Requires TAPI 2.0 or later
Header	Tapi.h

See also

lineClose

lineDeallocateCall

lineGetCallInfo

lineGetConfRelatedCalls

lineGetNewCalls

lineOpen

lineSetCallPrivilege

lineShutdown