TSPI_lineGetAddressStatus function (tspi.h)
The TSPI_lineGetAddressStatus function queries the specified address for its current status.
LONG TSPIAPI TSPI_lineGetAddressStatus( HDRVLINE hdLine, DWORD dwAddressID, LPLINEADDRESSSTATUS lpAddressStatus );
The service provider's handle to the line containing the address to be queried.
An address on the given open line device. This is the address to be queried. An address identifier is permanently associated with an address; the identifier remains constant across operating system upgrades. This parameter is not validated by TAPI when this function is called.
A pointer to a variably sized data structure of type LINEADDRESSSTATUS.
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.