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<H1><A NAME="_tapi2_linehold"></A>lineHold</H1>
<P>The <B>lineHold</B> function places the specified call on hold. </P>
<PRE class=syntax><B>LONG WINAPI lineHold(
HCALL</B><I> hCall </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hCall</I> </DT>
<DD>A handle to the call to be placed on hold. The application must be an owner of the call. The call state of <I>hCall</I> must be <I>connected</I>.
</DD>
</DL>
<H4>Return Values</H4>
<P>Returns a positive request identifier if the function is completed asynchronously or a negative error number if an error occurs. The <I>dwParam2</I> parameter of the corresponding <A HREF="msgs_65mh.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_65mh.htm">LINE_REPLY</A> message is zero if the function succeeds or it is a negative error number if an error occurs. Possible return values are: </P>
<P>LINEERR_INVALCALLHANDLE, LINEERR_OPERATIONUNAVAIL, LINEERR_INVALCALLSTATE, LINEERR_OPERATIONFAILED, LINEERR_NOMEM, LINEERR_RESOURCEUNAVAIL, LINEERR_NOTOWNER, LINEERR_UNINITIALIZED.</P>
<H4>Remarks</H4>
<P>The call on hold is temporarily disconnected allowing the application to use the line device for making or answering other calls. The <B>lineHold</B> function performs a so-called "hard hold" of the specified call (as opposed to a "consultation call"). A call on hard hold typically cannot be transferred or included in a conference call, but a consultation call can. Consultation calls are initiated using <A HREF="func2_8ofm.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_8ofm.htm"><B>lineSetupTransfer</B></A>, <A HREF="func2_7z8l.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_7z8l.htm"><B>lineSetupConference</B></A>, or <A HREF="func2_8e1x.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_8e1x.htm"><B>linePrepareAddToConference</B></A>. </P>
<P>After a call has been successfully placed on hold, the call state typically transitions to <I>onHold</I>. A held call is retrieved by <A HREF="func2_2ulg.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_2ulg.htm"><B>lineUnhold</B></A>. While a call is on hold, the application can receive <A HREF="msgs_1xid.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1xid.htm">LINE_CALLSTATE</A> messages about state changes of the held call. For example, if the held party hangs up, the call state can transition to <I>disconnected</I>. </P>
<P>In a bridged situation, a <B>lineHold</B> operation may possibly not actually place the call on hold, because the status of other stations on the call can govern (for example, attempting to "hold" a call when other stations are participating is not be possible); instead, the call can simply be changed to the LINECONNECTEDMODE_INACTIVE mode if it remains <I>connected</I> at other stations. </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> 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 1.3 or later.<BR>
<B> Header: </B>Declared in Tapi.h.<BR>
<B> Library: </B>Use Tapi32.lib.</P>
<H4>See Also</H4>
<P><A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/tapi3/tapiovr2_0702.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/tapi3/tapiovr2_0702.htm'" tppabs="http://msdn.microsoft.com/library/psdk/tapi3/tapiovr2_0702.htm">Hold Overview</A>, <A HREF="quickref_1okl.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_1okl.htm">TAPI 2.2 Reference Overview</A>, <A HREF="quickref_6gvn.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/quickref_6gvn.htm">Supplementary Line Service Functions</A>, <A HREF="msgs_1xid.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1xid.htm">LINE_CALLSTATE</A>, <A HREF="func2_8e1x.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_8e1x.htm"><B>linePrepareAddToConference</B></A>, <A HREF="func2_7z8l.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_7z8l.htm"><B>lineSetupConference</B></A>, <A HREF="func2_8ofm.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_8ofm.htm"><B>lineSetupTransfer</B></A>, <A HREF="func2_2ulg.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/func2_2ulg.htm"><B>lineUnhold</B></A></P>
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