TSPI_lineNegotiateTSPIVersion

The TSPI_lineNegotiateTSPIVersion function returns the highest SPI version the service provider can operate under for this device, given the range of possible SPI versions.

LONG TSPI_lineNegotiateTSPIVersion(
  DWORD dwDeviceID,    
  DWORD dwLowVersion,  
  DWORD dwHighVersion, 
  LPDWORD lpdwTSPIVersion  
);
 

Parameters

dwDeviceID

Identifies the line device for which interface version negotiation is to be performed. In addition to device identifiers within the range the service provider supports, this may be the value:

INITIALIZE_NEGOTIATION

This value is used to signify that an overall interface version is to be negotiated.

dwLowVersion

The lowest TSPI version number under which TAPI can operate. The most-significant WORD is the major version number and the least-significant WORD is the minor version number.

dwHighVersion

The highest TSPI version number under which TAPI can operate. The most-significant WORD is the major version number and the least-significant WORD is the minor version number.

lpdwTSPIVersion

A pointer to a DWORD. The service provider fills this location with the highest TSPI version number, within the range requested by the caller, under which the service provider can operate. The most-significant WORD is the major version number and the least-significant WORD is the minor version number. If the requested range does not overlap the range supported by the service provider, the function returns LINEERR_INCOMPATIBLEAPIVERSION.

Return Values

Returns zero if the function succeeds, or an error number if an error occurs. Possible return values are as follows:

LINEERR_INCOMPATIBLEAPIVERSION, LINEERR_OPERATIONUNAVAIL, LINEERR_NODRIVER, LINEERR_OPERATIONFAILED, LINEERR_NOMEM, LINEERR_RESOURCEUNAVAIL.

Remarks

When dwDeviceID is INITIALIZE_NEGOTIATION, this function must not return LINEERR_OPERATIONUNAVAIL, because this function (with that value) is mandatory for negotiating the overall interface version even if the service provider supports no line devices.

See Also

INITIALIZE_NEGOTIATION, TAPI Versions, TSPI_lineGetExtensionID, TSPI_lineNegotiateExtVersion, TSPI_providerInit