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 |
|