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<H1><A NAME="_tapi2_phonehookswitchdev__constants"></A>PHONEHOOKSWITCHDEV_ Constants</H1>

<P>The PHONEHOOKSWITCHDEV_ bit-flag constants describe various audio I/O devices each with its own hookswitch controllable from the computer. 

<DL>
<DT>PHONEHOOKSWITCHDEV_HANDSET </DT>

<DD>This is a standard ear- and mouthpiece phone. </DD>

<DT>PHONEHOOKSWITCHDEV_HEADSET </DT>

<DD>This is a headset connected to the phone set. </DD>

<DT>PHONEHOOKSWITCHDEV_SPEAKER </DT>

<DD>This is a built-in loudspeaker and microphone. This could also be an externally connected adjunct speaker to the telephone set. 
</DD>
</DL>

<P>No extensibility. All 32 bits are reserved. </P>

<P>These constants are used in the <A HREF="struc2_8rua.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_8rua.htm"><B>PHONECAPS</B></A> data structure to indicate the hookswitch device capabilities of a phone device. The <A HREF="struc2_3do2.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_3do2.htm"><B>PHONESTATUS</B></A> structure reports the state of the phone's hookswitch devices. The function <A HREF="func2_2q7c.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_2q7c.htm"><B>phoneSetHookSwitch</B></A> and <A HREF="func2_7yy0.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_7yy0.htm"><B>phoneGetHookSwitch</B></A> use it as a parameter to select the phone's I/O device. </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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