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<H1><A NAME="_tapi2_linespecialinfo__constants"></A>LINESPECIALINFO_ Constants</H1>

<P>The LINESPECIALINFO_ bit-flag constants describes special information signals that the network can use to report various reporting and network observation operations. They are special coded tone sequences transmitted at the beginning of network advisory recorded announcements. 

<DL>
<DT>LINESPECIALINFO_CUSTIRREG </DT>

<DD>This special information tone precedes a vacant number, AIS, Centrex number change and nonworking station, access code not dialed or dialed in error, or manual intercept operator message (customer irregularity category). LINESPECIALINFO_CUSTIRREG is also reported when billing information is rejected and when the dialed address is blocked at the switch. </DD>

<DT>LINESPECIALINFO_NOCIRCUIT </DT>

<DD>This special information tone precedes a no circuit or an emergency announcement (trunk blockage category). </DD>

<DT>LINESPECIALINFO_REORDER </DT>

<DD>This special information tone precedes a reorder announcement (equipment irregularity category). LINESPECIALINFO_REORDER is also reported when the telephone is kept offhook too long. </DD>

<DT>LINESPECIALINFO_UNAVAIL </DT>

<DD>Specifics about the special information tone are unavailable and will not become known. </DD>

<DT>LINESPECIALINFO_UNKNOWN </DT>

<DD>Specifics about the special information tone are currently unknown but may become known later. 
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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>Special information tones are defined for advisory messages and are not normally used for billing or supervisory purpose. </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 NT 4.0 SP3 or later.<BR>
<B>&nbsp;&nbsp;Windows 95/98: </B>Requires Windows 95 or later.<BR>
<B>&nbsp;&nbsp;Version: </B>Requires TAPI 2.0 or later.<BR>
<B>&nbsp;&nbsp;Header: </B>Declared in Tapi.h.</P>
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