LINE_ADDRESSSTATE message
The TAPI LINE_ADDRESSSTATE message is sent when the status of an address changes on a line that is currently open by the application. The application can invoke lineGetAddressStatus to determine the current status of the address.
Parameters
-
hDevice
-
A handle to the line device.
-
dwCallbackInstance
-
The callback instance supplied when opening the line.
-
dwParam1
-
The address identifier of the address that changed status.
-
dwParam2
-
The address state that changed. Can be one or more of the LINEADDRESSSTATE_ constants.
-
dwParam3
-
Unused.
Return value
No return value.
Remarks
The LINE_ADDRESSSTATE message is sent to any application that has opened the line device and that has enabled this message. The sending of this message for the various status items can be controlled and queried using lineGetStatusMessages and lineSetStatusMessages. By default, address status reporting is disabled.
Requirements
| Requirement | Value |
|---|---|
| TAPI version |
Requires TAPI 2.0 or later |
| Header |
|