Use the lineGetCallBarringState function to retrieve the current barring state for a given mode.
LONG WINAPI lineGetCallBarringState( HLINE hLine, DWORD dwMode, LPDWORD lpdwClasses, LPCTSTR lpszPassword );
The line device handle. The line device handle must have been previously obtained by a call to lineOpen with the proper TAPI device ID specified and a device-specific extension version successfully negotiated with lineNegotiateExtVersion. For more information about lineNegotiateExtVersion and lineOpen, see the TAPI Functions API Reference topics on MSDN.
Indicates which barring mode the application needs status on.
Points to a bit field DWORD indicating which media modes are currently barred. See the Barring Modes constants for possible values.
A password may be necessary to read the current barring status.
Returns zero if the function completes successfully, or a negative error number if an error occurs. The following are possible return values:
This function is synchronous. No LINE_REPLY message is sent. Not implemented for CDMA.
Pocket PC: Pocket PC 2002 and later.
Smartphone: Smartphone 2002 and later.
OS Versions: Windows CE 3.0 and later.
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