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<H1><A NAME="_tapi2_linemonitortone_str"></A>LINEMONITORTONE</H1>
<P>The <B>LINEMONITORTONE</B> structure describes a tone to be monitored. This is used as an entry in an array. The <A HREF="func2_77eb.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_77eb.htm"><B>lineMonitorTones</B></A> and <A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/tspi21/func2_4jar.htm \n\n這個(gè)文件不能通過 Teleport Pro 取回, 因?yàn)?地址在一個(gè)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/tspi21/func2_4jar.htm'" tppabs="http://msdn.microsoft.com/library/psdk/tspi21/func2_4jar.htm"><B>TSPI_lineMonitorTones</B></A> functions use this structure.</P>
<PRE class=syntax>typedef struct linemonitortone_tag {
DWORD dwAppSpecific;
DWORD dwDuration;
DWORD dwFrequency1;
DWORD dwFrequency2;
DWORD dwFrequency3;
} LINEMONITORTONE, FAR *LPLINEMONITORTONE; </PRE>
<H4>Members</H4>
<DL>
<DT><B>dwAppSpecific</B> </DT>
<DD>Used by the application for tagging the tone. When this tone is detected, the value of the <B>dwAppSpecific</B> member is passed back to the application. </DD>
<DT><B>dwDuration</B> </DT>
<DD>The duration, in milliseconds, during which the tone should be present before a detection is made. </DD>
<DT><B>dwFrequency1</B> </DT>
<DT><B>dwFrequency2</B> </DT>
<DT><B>dwFrequency3</B> </DT>
<DD>The frequency, in hertz, of a component of the tone. If fewer than three frequencies are needed in the tone, a value of 0 should be used for the unused frequencies. A tone with all three frequencies set to zero is interpreted as silence and can be used for silence detection.
</DD>
</DL>
<H4>Remarks</H4>
<P>This structure may not be extended.</P>
<P>The <B>LINEMONITORTONE</B> structure defines a tone for the purpose of detection. An array of tones is passed to the <A HREF="func2_77eb.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_77eb.htm"><B>lineMonitorTones</B></A> function which monitors these tones and sends a LINE_MONITORTONE message to the application when a detection is made. </P>
<P>A tone with all frequencies set to zero corresponds to silence. An application can thus monitor the call's information stream for silence. </P>
<H4><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/sdkintro/guide_927n.htm \n\n這個(gè)文件不能通過 Teleport Pro 取回, 因?yàn)?地址在一個(gè)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 1.4 or later.<BR>
<B> Header: </B>Declared in Tapi.h.</P>
<H4>See Also</H4>
<P><A HREF="msgs_8nz9.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_8nz9.htm">LINE_MONITORTONE</A>, <A HREF="func2_77eb.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_77eb.htm"><B>lineMonitorTones</B></A>, <A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/tspi21/func2_4jar.htm \n\n這個(gè)文件不能通過 Teleport Pro 取回, 因?yàn)?地址在一個(gè)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/tspi21/func2_4jar.htm'" tppabs="http://msdn.microsoft.com/library/psdk/tspi21/func2_4jar.htm"><B>TSPI_lineMonitorTones</B></A> </P>
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