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<H1><A NAME="_tapi2_linetonemode__constants"></A>LINETONEMODE_ Constants</H1>
<P>The LINETONEMODE_ constants describe different selections that are used when generating line tones.
<DL>
<DT>LINETONEMODE_BEEP </DT>
<DD>The tone is a beep, such as that used to announce the beginning of a recording. Exact definition is service-provider defined. </DD>
<DT>LINETONEMODE_BILLING </DT>
<DD>The tone is a billing information tone such as a credit card prompt tone. Exact definition is service-provider defined. </DD>
<DT>LINETONEMODE_BUSY </DT>
<DD>The tone is a busy tone. Exact definition is service-provider defined. </DD>
<DT>LINETONEMODE_CUSTOM </DT>
<DD>The tone is a custom tone defined by its component frequencies, of type <A HREF="struc2_838y.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_838y.htm"><B>LINEGENERATETONE</B></A>. </DD>
<DT>LINETONEMODE_RINGBACK </DT>
<DD>The tone is ringback tone. Exact definition is service-provider defined.
</DD>
</DL>
<P>The high-order 16 bits can be assigned for device-specific extensions. The low-order 16 bits are reserved. </P>
<P>These constants are used to define tones to be generated inband over a call to the remote party. Note that tone detection of non-custom tones does not use these constants. </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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