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<H1><A NAME="_tapi2_linedialtonemode__constants"></A>LINEDIALTONEMODE_ Constants</H1>
<P>The LINEDIALTONEMODE_ bit-flag constants describe different types of dial tones. A special dial tone typically carries a special meaning (as with message waiting).
<DL>
<DT>LINEDIALTONEMODE_EXTERNAL </DT>
<DD>This is an external (public network) dial tone. </DD>
<DT>LINEDIALTONEMODE_INTERNAL </DT>
<DD>This is an internal dial tone, as within a PBX. </DD>
<DT>LINEDIALTONEMODE_NORMAL </DT>
<DD>This is a normal dial tone, which typically is a continuous tone. </DD>
<DT>LINEDIALTONEMODE_SPECIAL </DT>
<DD>This is a special dial tone indicating that a certain condition (known by the switch or network) is currently in effect. Special dial tones typically use an interrupted tone. As with a normal dial tone, this indicates that the switch is ready to receive the number to be dialed. </DD>
<DT>LINEDIALTONEMODE_UNAVAIL </DT>
<DD>The dial tone mode is unavailable and will not become known. </DD>
<DT>LINEDIALTONEMODE_UNKNOWN </DT>
<DD>The dial tone mode is not currently known but may become known later.
</DD>
</DL>
<P>The high-order 16 bits can be assigned for device-specific extensions. The low-order 16 bits are reserved. </P>
<P>The LINEDIALTONEMODE_ constants are used within the <A HREF="struc1_7vxu.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc1_7vxu.htm"><B>LINECALLSTATUS</B></A> data structure for a call in the <I>dialtone</I> state. </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?yàn)?地址在一個域或?yàn)樗拈_始地址設(shè)定的邊界的外部路徑上. \n\n你想從服務(wù)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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