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ITAddress2::DeviceSpecificVariant method (tapi3if.h)

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The DeviceSpecificVariant method enables service providers to provide access to features not offered by other TAPI functions. The meaning of the extensions are device specific, and taking advantage of these extensions requires the application to be fully aware of them.

This method is provided for Automation client applications, such as those written in Visual Basic. C and C++ applications must use the DeviceSpecific method.

Syntax

HRESULT DeviceSpecificVariant(
  [in] ITCallInfo *pCall,
  [in] VARIANT    varDevSpecificByteArray
);

Parameters

[in] pCall

Pointer to the ITCallInfo interface of the call object.

[in] varDevSpecificByteArray

VARIANT containing the parameter block. The format of this parameter block is device specific; TAPI passes its contents between the application and the service provider.

Return value

This method can return one of these values.

Return code Description
S_OK
 Method succeeded.
E_POINTER
 The pCall parameter is not a valid pointer.
E_OUTOFMEMORY
 Insufficient memory exists to perform the operation.

Requirements

Requirement Value
Target Platform Windows
Header tapi3if.h (include Tapi3.h)
Library Uuid.lib
DLL Tapi3.dll

See also

DeviceSpecific

NegotiateExtVersion

lineDevSpecific