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<H1><A NAME="_tapi2_linecalltreatment__constants"></A>LINECALLTREATMENT_ Constants</H1>

<P>The LINECALLTREATMENT_ constants list treatments for calls that are unanswered or on hold. Except for basic parameter validation, call treatment is a straight pass-through by TAPI to the service provider. 

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<DT>LINECALLTREATMENT_BUSY </DT>

<DD>When the call is not actively connected to a device (<I>offering</I> or <I>onhold</I>), the party hears busy signal. </DD>

<DT>LINECALLTREATMENT_MUSIC </DT>

<DD>When the call is not actively connected to a device (<I>offering</I> or <I>onhold</I>), the party hears music. </DD>

<DT>LINECALLTREATMENT_RINGBACK </DT>

<DD>When the call is not actively connected to a device (<I>offering</I> or <I>onhold</I>), the party hears ringback tone. </DD>

<DT>LINECALLTREATMENT_SILENCE </DT>

<DD>When the call is not actively connected to a device (<I>offering</I> or <I>onhold</I>), the party hears silence. 
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<P>The value 0x00000000 is reserved to indicate that the service provider does not support call treatments. Values in the range 0x00000005 through 0x000000FF are reserved for future definition. Values in the range 0x00000100 through 0xFFFFFFFF are reserved for assignment by service providers, and may include identification of specific musical selections or recorded announcements. </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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