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<TITLE>LINECALLREASON_ Constants</TITLE>
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<H1><A NAME="_tapi2_linecallreason__constants"></A>LINECALLREASON_ Constants</H1>
<P>The LINECALLREASON_ bit-flag constants describe the reason for a call.
<DL>
<DT>LINECALLREASON_CALLCOMPLETION </DT>
<DD>The call was the result of a call completion request. </DD>
<DT>LINECALLREASON_CAMPEDON </DT>
<DD>The call was camped on the address. Usually, it appears initially in the <I>onhold</I> state, and can be switched to using <A HREF="func2_4rxg.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_4rxg.htm"><B>lineSwapHold</B></A>. If an active call becomes <I>idle</I>, the camped-on call may change to the <I>offering</I> state and the device start ringing. </DD>
<DT>LINECALLREASON_DIRECT </DT>
<DD>This is a direct incoming or outgoing call. </DD>
<DT>LINECALLREASON_FWDBUSY </DT>
<DD>This call was forwarded from another extension that was busy at the time of the call. </DD>
<DT>LINECALLREASON_FWDNOANSWER </DT>
<DD>The call was forwarded from another extension that didn't answer the call after some number of rings. </DD>
<DT>LINECALLREASON_FWDUNCOND </DT>
<DD>The call was forwarded unconditionally from another number. </DD>
<DT>LINECALLREASON_INTRUDE </DT>
<DD>The call intruded onto the line, either by a call completion action invoked by another station or by operator action. Depending on switch implementation, the call may appear either in the <I>connected</I> state, or <I>conferenced</I> with an existing active call on the line. </DD>
<DT>LINECALLREASON_PARKED </DT>
<DD>The call was parked on the address. Usually, it appears initially in the <I>onhold</I> state. </DD>
<DT>LINECALLREASON_PICKUP </DT>
<DD>The call was picked up from another extension. </DD>
<DT>LINECALLREASON_REDIRECT </DT>
<DD>The call was redirected to this station. </DD>
<DT>LINECALLREASON_REMINDER </DT>
<DD>The call is a reminder (or "recall") that the user has a call parked or on hold for (potentially) a long time. </DD>
<DT>LINECALLREASON_ROUTEREQUEST </DT>
<DD>The call appears on the address because the switch needs routing instructions from the application. The application should examine the <B>CalledID</B> member in <A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A>, and use the <A HREF="func2_0yt0.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_0yt0.htm"><B>lineRedirect</B></A> function to provide a new dialable address for the call. If the call is to be blocked instead, the application may call <A HREF="func1_1i5s.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_1i5s.htm"><B>lineDrop</B></A>. If the application fails to take action within a switch-defined timeout period, a default action will be taken. A service provider can use this constant only if the negotiated version on the line is 2.0 or higher. Otherwise the service provider should substitute LINECALLREASON_UNAVAIL.</DD>
<DT>LINECALLREASON_TRANSFER </DT>
<DD>The call has been transferred from another number. </DD>
<DT>LINECALLREASON_UNAVAIL </DT>
<DD>The reason for the call is unavailable and will not become known later. </DD>
<DT>LINECALLREASON_UNKNOWN </DT>
<DD>The reason for the call is currently unknown but may become known later. </DD>
<DT>LINECALLREASON_UNPARK </DT>
<DD>The call was retrieved as a parked call.
</DD>
</DL>
<P>No extensibility. All 32 bits are reserved. </P>
<P>The LINECALLREASON_ constants are used in the <B>dwReason</B> member of the <A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A> data structure. </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> 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 2.0 or later.<BR>
<B> Header: </B>Declared in Tapi.h.</P>
<H4>See Also</H4>
<P><A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A>, <A HREF="func1_1i5s.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_1i5s.htm"><B>lineDrop</B></A>, <A HREF="func2_0yt0.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_0yt0.htm"><B>lineRedirect</B></A>, <A HREF="func2_4rxg.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_4rxg.htm"><B>lineSwapHold</B></A></P>
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