The TSPI_lineGetAddressStatus function queries the specified address for its current status.
LONG TSPI_lineGetAddressStatus(
HDRVLINE hdLine,
DWORD dwAddressID,
LPLINEADDRESSSTATUS lpAddressStatus
);
Returns zero if the function succeeds or an error number if an error occurs. Possible return values are as follows:
LINEERR_INVALLINEHANDLE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALADDRESSID, LINEERR_OPERATIONFAILED, LINEERR_NOMEM, LINEERR_RESOURCEUNAVAIL.
The service provider fills in all the members of the LINEADDRESSSTATUS data structure, except for dwTotalSize, which is filled in by TAPI. The service provider must not overwrite the dwTotalSize member.