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<H1><A NAME="_tapi2_linebusymode__constants"></A>LINEBUSYMODE_ Constants</H1>
<P>The LINEBUSYMODE_ bit-flag constants describe different busy signals that the switch or network can generate. These busy signals typically indicate that a different resource that is required to make a call is currently in use.
<DL>
<DT>LINEBUSYMODE_STATION </DT>
<DD>The busy signal indicates that the called party's station is busy. This is usually signaled with a <I>normal</I> busy tone. </DD>
<DT>LINEBUSYMODE_TRUNK </DT>
<DD>The busy signal indicates that a trunk or circuit is busy. This is usually signaled with a <I>fast</I> busy tone. </DD>
<DT>LINEBUSYMODE_UNKNOWN </DT>
<DD>The busy signal's specific mode is currently unknown but may become known later. </DD>
<DT>LINEBUSYMODE_UNAVAIL </DT>
<DD>The busy signal's specific mode is unavailable and will not become known.
</DD>
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<P>The high-order 16 bits can be assigned for device-specific extensions. The low-order 16 bits are reserved. </P>
<P class=note><B>Note</B> Busy signals can be sent as inband tones or out-of-band messages. TAPI makes no assumption about the specific signaling mechanism. </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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