Version Parameters

Every function that takes a dwAPIVersion or similar parameter must set this parameter to either the highest API version supported by the application or the API version negotiated using the lineNegotiateAPIVersion or phoneNegotiateAPIVersion function on a particular device. Use the following table as a guide:

Function	Meaning
lineGetAddressCaps	Use version returned by lineNegotiateAPIVersion
lineGetCountry	Use highest version supported by the application
lineGetDevCaps	Use version returned by lineNegotiateAPIVersion
lineGetProviderList	Use highest version supported by the application
lineGetTranslateCaps	Use highest version supported by the application
lineNegotiateAPIVersion	Use highest version supported by the application
lineNegotiateExtVersion	Use version returned by lineNegotiateAPIVersion
lineOpen	Use version returned by lineNegotiateAPIVersion
lineTranslateAddress	Use highest version supported by the application
lineTranslateDialog	Use highest version supported by the application
phoneGetDevCaps	Use version returned by phoneNegotiateAPIVersion
phoneNegotiateAPIVersion	Use highest version supported by the application
phoneNegotiateExtVersion	Use version returned by phoneNegotiateAPIVersion
phoneOpen	Use version returned by phoneNegotiateAPIVersion

Important When negotiating an API version, always set the high and low version numbers to the range of versions that your application can support. For example, never use 0x00000000 for the low version or 0xFFFFFFFF for the high since these values require that your application support all versions of TAPI, both future and past.

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