LINE_CALLDEVSPECIFICFEATURE message
The TSPI LINE_CALLDEVSPECIFICFEATURE message is sent to the LINEEVENT callback function to notify TAPI about device-specific events occurring on a line or address. The meaning of the message and the interpretation of the dwParam1 through dwParam3 parameters is device specific.
Parameters
-
htLine
-
The TAPI opaque object handle to the line device.
-
htCall
-
The TAPI opaque object handle to the call device.
-
dwMsg
-
The value LINE_CALLDEVSPECIFICFEATURE.
-
dwParam1
-
Device specific.
-
dwParam2
-
Device specific.
-
dwParam3
-
Device specific.
Remarks
The LINE_CALLDEVSPECIFICFEATURE message is used by a service provider in conjunction with the TSPI_lineDevSpecificFeature function. Its meaning is device specific.
TAPI sends the LINE_DEVSPECIFICFEATURE message to applications in response to receiving this message from a service provider. The htLine and htCall parameters are translated to the appropriate hCall as the hDevice parameter at the TAPI level. The dwParam1, dwParam2, and dwParam3 parameters are passed through unmodified.
There is no directly corresponding message at the TAPI level, although this message is very similar to LINE_DEVSPECIFICFEATURE. At the TSPI level, the device-specific feature messages are split between those reporting events on lines and addresses, and those reporting events on calls.
Requirements
| Requirement | Value |
|---|---|
| TAPI version |
Requires TAPI 2.0 or later |
| Header |
|