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<H1><A NAME="_tapi2_phonenegotiateextversion"></A>phoneNegotiateExtVersion</H1>
<P>The <B>phoneNegotiateExtVersion</B> function 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 extensions. </P>
<PRE class=syntax><B>LONG WINAPI phoneNegotiateExtVersion(
HPHONEAPP</B><I> hPhoneApp</I><B>, </B>
<B> DWORD</B><I> dwDeviceID</I><B>, </B>
<B> DWORD</B><I> dwAPIVersion</I><B>, </B>
<B> DWORD</B><I> dwExtLowVersion</I><B>, </B>
<B> DWORD</B><I> dwExtHighVersion</I><B>, </B>
<B> LPDWORD</B><I> lpdwExtVersion </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hPhoneApp</I> </DT>
<DD>The handle to the application's registration with TAPI. </DD>
<DT><I>dwDeviceID</I> </DT>
<DD>The phone device to be queried. </DD>
<DT><I>dwAPIVersion</I> </DT>
<DD>The API version number that was negotiated for the specified phone device using <A HREF="func2_98ry.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_98ry.htm"><B>phoneNegotiateAPIVersion</B></A>. </DD>
<DT><I>dwExtLowVersion</I> </DT>
<DD>The least recent extension version of the extension identifier returned by <B>phoneNegotiateAPIVersion</B> that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number. </DD>
<DT><I>dwExtHighVersion</I> </DT>
<DD>The most recent extension version of the extension identifier returned by <B>phoneNegotiateAPIVersion</B> that the application is compliant with. The high-order word is the major version number; the low-order word is the minor version number. </DD>
<DT><I>lpdwExtVersion</I> </DT>
<DD>A pointer to a <B>DWORD</B> in which the extension version number that was negotiated is returned. If negotiation succeeds, this number is in the range <I>dwExtLowVersion</I> to <I>dwExtHighVersion</I>.
</DD>
</DL>
<H4>Return Values</H4>
<P>Returns zero if the request succeeds or a negative error number if an error occurs. Possible return values are: </P>
<P>PHONEERR_INVALAPPHANDLE, PHONEERR_OPERATIONFAILED, PHONEERR_BADDEVICEID, PHONEERR_OPERATIONUNAVAIL, PHONEERR_NODRIVER, PHONEERR_NOMEM, PHONEERR_INCOMPATIBLEAPIVERSION, PHONEERR_RESOURCEUNAVAIL, PHONEERR_INCOMPATIBLEEXTVERSION, PHONEERR_UNINITIALIZED, PHONEERR_INVALPOINTER, PHONEERR_NODEVICE.</P>
<H4>Remarks</H4>
<P>The <A HREF="func2_98ry.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_98ry.htm"><B>phoneNegotiateAPIVersion</B></A> function is used to negotiate the API version number to use. It returns the extension identifier supported by the phone device, or zeros if no extensions are provided. </P>
<P>In order for the application to use the extensions defined by the returned extension identifier, it must call <B>phoneNegotiateExtVersion</B> to negotiate the extension version to use. </P>
<P>Use <A HREF="func2_1tbs.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_1tbs.htm"><B>phoneInitializeEx</B></A> to determine the number of phone devices present in the system. The device identifier specified by <I>dwDeviceID</I> varies from zero to one less than the number of phone devices present. </P>
<P>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. </P>
<H4><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm \n\n這個文件不能通過 Teleport Pro 取回, 因為 地址在一個域或為它的開始地址設定的邊界的外部路徑上. \n\n你想從服務器打開它嗎?'))window.location='http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm'" tppabs="http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm">Requirements</A> </H4>
<P><B> Windows NT/2000: </B>Requires Windows NT 4.0 SP3 or later.<BR>
<B> Windows 95/98: </B>Requires Windows 95 or later.<BR>
<B> Version: </B>Requires TAPI 1.3 or later.<BR>
<B> Header: </B>Declared in Tapi.h.<BR>
<B> Library: </B>Use Tapi32.lib.</P>
<H4>See Also</H4>
<P><A HREF="quickref_1okl.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_1okl.htm">TAPI 2.2 Reference Overview</A>, <A HREF="quickref_3in9.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_3in9.htm">Extended Telephony Services Reference</A>, <A HREF="func2_1tbs.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_1tbs.htm"><B>phoneInitializeEx</B></A>, <A HREF="func2_98ry.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_98ry.htm"><B>phoneNegotiateAPIVersion</B></A> </P>
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