lineNegotiateExtVersion - Telephony API Programmer's Reference

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lineNegotiateExtVersion

The lineNegotiateExtVersion function allows an application to negotiate an extension version to use with the specified line device. This operation need not be called if the application does not support extensions.

LONG lineNegotiateExtVersion(

HLINEAPP hLineApp,
DWORD dwDeviceID,
DWORD dwAPIVersion,
DWORD dwExtLowVersion,
DWORD dwExtHighVersion,
LPDWORD lpdwExtVersion
);

Parameters
hLineApp

The handle to the application's registration with TAPI.

dwDeviceID

The line device to be queried.

dwAPIVersion

The API version number that was negotiated for the specified line device using lineNegotiateAPIVersion.

dwExtLowVersion

The least recent extension version of the extension ID returned by lineNegotiateAPIVersion that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

dwExtHighVersion

The most recent extension version of the extension ID returned by lineNegotiateAPIVersion that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number.

lpdwExtVersion

A pointer to a DWORD-sized location that contains the extension version number that was negotiated. If negotiation is successful, this number will be in the range between dwExtLowVersion and dwExtHighVersion.

Return Values
Returns zero if the request is successful or a negative error number if an error has occurred. Possible return values are:

LINEERR_BADDEVICEID, LINEERR_NOMEM, LINEERR_INCOMPATIBLEAPIVERSION, LINEERR_NODRIVER, LINEERR_INCOMPATIBLEEXTVERSION, LINEERR_OPERATIONFAILED, LINEERR_INVALAPPHANDLE, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALPOINTER, LINEERR_UNINITIALIZED, LINEERR_NODEVICE, LINEERR_OPERATIONUNAVAIL.

Remarks
Use lineInitializeEx to determine the number of line devices present in the system. The device ID specified by dwDeviceID varies from zero to one less than the number of line devices present.

The lineNegotiateAPIVersion function negotiates the API version number to use. It also retrieves the extension ID supported by the line device, which is zeros if no extensions are provided. Version numbers should be incremented by one for each release. Leaving gaps in release version numbering may cause unexpected results.

If the application wants to use the extensions defined by the returned extension ID, it must call lineNegotiateExtVersion to negotiate the extension version to use.

The extension version number negotiated is that under which the application and service provider must both operate. If version ranges do not overlap, the application and service provider versions are incompatible and an error is returned.

See Also
lineInitializeEx, lineNegotiateAPIVersion

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