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<H1><A NAME="_tapi2_linecallorigin__constants"></A>LINECALLORIGIN_ Constants</H1>
<P>The LINECALLORIGIN_ constants describe the origin of a call.
<DL>
<DT>LINECALLORIGIN_CONFERENCE </DT>
<DD>The call handle is for a conference call, that is, it is the application's connection to the conference bridge in the switch. </DD>
<DT>LINECALLORIGIN_EXTERNAL </DT>
<DD>The call originated as an incoming call on an external line. </DD>
<DT>LINECALLORIGIN_INBOUND </DT>
<DD>The call originated as an incoming call, but the service provider is unable to determine whether it came from another station on the same switch or from an external line. Service providers can use this constant only when TAPI version 1.4 or later has been negotiated. Otherwise, the service provider can substitute LINECALLORIGIN_UNAVAIL.</DD>
<DT>LINECALLORIGIN_INTERNAL </DT>
<DD>The call originated as an incoming call at a station internal to the same switching environment. </DD>
<DT>LINECALLORIGIN_OUTBOUND </DT>
<DD>The call originated from this station as an outgoing call. </DD>
<DT>LINECALLORIGIN_UNAVAIL </DT>
<DD>The call origin is not available and will never become known for this call. </DD>
<DT>LINECALLORIGIN_UNKNOWN </DT>
<DD>The call origin is currently unknown but may become known later.
</DD>
</DL>
<P>No extensibility. All 32 bits are reserved. </P>
<P>The origin of a call is stored in the <B>dwOrigin</B> member of the call's <A HREF="struc1_4oky.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_4oky.htm"><B>LINECALLINFO</B></A> structure. </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 2.0 or later.<BR>
<B> Header: </B>Declared in Tapi.h.</P>
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