ITPhone::NegotiateExtVersion method (tapi3if.h)

The NegotiateExtVersion method allows an application to negotiate an extension version to use with the specified phone device. This operation need not be called if the application does not support provider specific extensions.

Syntax

HRESULT NegotiateExtVersion(
  [in]  long lLowVersion,
  [in]  long lHighVersion,
  [out] long *plExtVersion
);

Parameters

[in] lLowVersion

Least recent extension version of the extension identifier returned by NegotiateExtVersion that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

[in] lHighVersion

Most recent extension version of the extension identifier returned by NegotiateExtVersion that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

[out] plExtVersion

Pointer to a long that contains the extension version number that was negotiated. If negotiation succeeds, this number is in the range between lLowVersion and lHighVersion.

Return value

This method can return one of these values.

Requirements

See also

DeviceSpecific

DeviceSpecificVariant

lineNegotiateExtVersion