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4/8/2010

This function retrieves the extension identifier that the service provider supports for the indicated phone device.

Syntax 

LONG TSPIAPI TSPI_phoneGetExtensionID(
  DWORD 
dwDeviceID, 
  DWORD 
dwTSPIVersion, 
  LPPHONEEXTENSIONID 
lpExtensionID 
);

Parameters

dwDeviceID

Phone device to be queried.

dwTSPIVersion

Interface version number that is negotiated for this device using the TSPI_phoneNegotiateTSPIVersionfunction. This function operates according to the interface specification at this version level.

lpExtensionID

A pointer to a structure of type PHONEEXTENSIONID. If the service provider supports provider-specific extensions, it fills this structure with the extension identifier of these extensions. If the service provider does not support extensions, it fills this structure with all zeros. An extension identifier of all zeros is not a legal extension identifier, because the all-zeros value is used to indicate that the service provider does not support extensions.

Return Value

Returns zero if the function succeeds, or an error number if an error occurs. The following table shows the return values for this method.

Value Description

PHONEERR_INCOMPATIBLEAPIVERSION

The API version is incompatible.

PHONEERR_RESOURCEUNAVAIL

The resource is unavailable.

PHONEERR_NODRIVER

The driver cannot be found.

PHONEERR_OPERATIONFAILED

The operation failed.

PHONEERR_NOMEM

Not enough memory is available.

PHONEERR_OPERATIONUNAVAIL

The operation is unavailable.

Remarks

This function is typically called by TAPI in response to an application calling the phoneNegotiateAPIVersionfunction. The result returned by the service provider should be appropriate for use in a subsequent call to TSPI_phoneNegotiateExtVersion.

Requirements

Header tapicomn.h
Library coredll.lib
Windows Embedded CE Windows CE 3.0 and later
Windows Mobile Windows Mobile Version 5.0 and later

See Also