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<H1><A NAME="_tapi2_linefeature__constants"></A>LINEFEATURE_ Constants</H1>
<P>The LINEFEATURE_ constants list the operations that can be invoked on a line using this API.
<DL>
<DT>LINEFEATURE_DEVSPECIFIC </DT>
<DD>Device-specific operations can be used on the line. </DD>
<DT>LINEFEATURE_DEVSPECIFICFEAT </DT>
<DD>Device-specific features can be used on the line. </DD>
<DT>LINEFEATURE_FORWARD </DT>
<DD>Forwarding of all addresses can be used on the line. </DD>
<DT>LINEFEATURE_FORWARDDND </DT>
<DD>The <B>lineForward</B> function (with an empty destination address) can be used to turn on the Do Not Disturb feature on all addresses on the line. LINEFEATURE_FORWARD will also be set. This flag is exposed only to applications that negotiate a TAPI version of 2.0 or higher.</DD>
<DT>LINEFEATURE_FORWARDFWD </DT>
<DD>The <A HREF="func1_36jo.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_36jo.htm"><B>lineForward</B></A> function can be used to forward calls on all address on the line to other numbers. LINEFEATURE_FORWARD will also be set. This flag is exposed only to applications that negotiate a TAPI version of 2.0 or higher.</DD>
<DT>LINEFEATURE_MAKECALL </DT>
<DD>An outgoing call can be placed on this line using an unspecified address. </DD>
<DT>LINEFEATURE_SETDEVSTATUS </DT>
<DD>The <A HREF="func2_5ygj.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_5ygj.htm"><B>lineSetLineDevStatus</B></A> function can be invoked on the line device. This flag is exposed only to applications that negotiate a TAPI version of 2.0 or higher.</DD>
<DT>LINEFEATURE_SETMEDIACONTROL </DT>
<DD>Media control can be set on this line. </DD>
<DT>LINEFEATURE_SETTERMINAL </DT>
<DD>Terminal modes for this line can be set.
<P class=note><B>Note</B> If neither of the new modified "FORWARD" bits is set in the <B>dwLineFeatures</B> member in <A HREF="struc2_40oi.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_40oi.htm"><B>LINEDEVSTATUS</B></A> but the LINEFEATURE_FORWARD bit <I>is</I> set, then any of the forward modes can work; the service provider has simply not specified which ones.
</DD>
</DL>
<P>No extensibility. All 32 bits are reserved. </P>
<P>The LINEFEATURE_ constants are used in <A HREF="struc2_40oi.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_40oi.htm"><B>LINEDEVSTATUS</B></A> (returned by <A HREF="func1_4377.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_4377.htm"><B>lineGetLineDevStatus</B></A>). <B>LINEDEVSTATUS</B> reports, for a given line, which line features can actually be invoked while the line is in the current state. An application would make this determination dynamically after line state changes, typically caused by address or call-related activities on the line. </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>
<H4>See Also</H4>
<P><A HREF="struc2_40oi.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_40oi.htm"><B>LINEDEVSTATUS</B></A>, <A HREF="func1_36jo.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_36jo.htm"><B>lineForward</B></A>, <A HREF="func1_4377.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func1_4377.htm"><B>lineGetLineDevStatus</B></A>, <A HREF="func2_5ygj.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_5ygj.htm"><B>lineSetLineDevStatus</B></A> </P>
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