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<H1><A NAME="_tapi2_linecallhubtracking__constants"></A>LINECALLHUBTRACKING_ Constants</H1>

<P>The LINECALLHUBTRACKING_ bit-flag constants describe the type of call hub tracking provided.

<DL>
<DT>LINECALLHUBTRACKING_ALLCALLS</DT>

<DD>Call hub tracking is provided at the call level. </DD>

<DT>LINECALLHUBTRACKING_NONE</DT>

<DD>No call hub tracking is provided.</DD>

<DT>LINECALLHUBTRACKING_PROVIDERLEVEL</DT>

<DD>Call hubs are tracked at the service provider level. Call by call changes are not reported.
</DD>
</DL>

<P>No extensibility. All 32 bits are reserved. </P>

<P>When changes occur in this data structure, a <A HREF="msgs_1x0v.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1x0v.htm">LINE_CALLINFO</A> message is sent to the application. The parameters to this message are a handle to the call and an indication of the information item that has changed. The <A HREF="struc1_8l0y.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_8l0y.htm"><B>LINECALLHUBTRACKINGINFO</B></A> data structure indicates which tracking type is provided.</P>

<H4><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm  \n\n这个文件不能通过 Teleport Pro 取回, 因为 地址在一个域或为它的开始地址设定的边界的外部路径上.  \n\n你想从服务器打开它吗?'))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>&nbsp;&nbsp;Windows NT/2000: </B>Requires Windows 2000.<BR>
<B>&nbsp;&nbsp;Windows 95/98: </B>Unsupported.<BR>
<B>&nbsp;&nbsp;Version: </B>Requires TAPI 3.0 or later.<BR>
<B>&nbsp;&nbsp;Header: </B>Declared in Tapi.h.</P>

<H4>See Also</H4>

<P><A HREF="msgs_1x0v.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1x0v.htm">LINE_CALLINFO</A>, <A HREF="struc1_8l0y.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_8l0y.htm"><B>LINECALLHUBTRACKINGINFO</B></A>, <A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A></P>
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