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<H1><A NAME="_tapi2_linedrop"></A>lineDrop</H1>
<P>The <B>lineDrop</B> function drops or disconnects the specified call. The application has the option to specify user-user information to be transmitted as part of the call disconnect. </P>
<PRE class=syntax><B>LONG WINAPI lineDrop(
HCALL</B><I> hCall</I><B>, </B>
<B> LPCSTR</B><I> lpsUserUserInfo</I><B>, </B>
<B> DWORD</B><I> dwSize </I>
<B>);</B></PRE>
<H4>Parameters</H4>
<DL>
<DT><I>hCall</I> </DT>
<DD>A handle to the call to be dropped. The application must be an owner of the call. The call state of <I>hCall</I> can be any state except <I>idle</I>. </DD>
<DT><I>lpsUserUserInfo</I> </DT>
<DD>A pointer to a string containing user-user information to be sent to the remote party as part of the call disconnect. This pointer can be left NULL if no user-user information is to be sent. User-user information is only sent if supported by the underlying network (see <A HREF="struc2_67aq.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/struc2_67aq.htm"><B>LINEDEVCAPS</B></A>). The protocol discriminator field for the user-user information, if required, should appear as the first byte of the buffer pointed to by <I>lpsUserUserInfo</I>, and must be accounted for in <I>dwSize</I>. </DD>
<DT><I>dwSize</I> </DT>
<DD>The size in bytes of the user-user information in <I>lpsUserUserInfo</I>. If <I>lpsUserUserInfo</I> is NULL, no user-user information is sent to the calling party and <I>dwSize</I> is ignored.
</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_NOMEM, LINEERR_OPERATIONFAILED, LINEERR_NOTOWNER, LINEERR_RESOURCEUNAVAIL, LINEERR_INVALPOINTER, LINEERR_USERUSERINFOTOOBIG, LINEERR_INVALCALLSTATE, LINEERR_UNINITIALIZED.</P>
<H4>Remarks</H4>
<P>When invoking <B>lineDrop</B>, related calls can sometimes be affected as well. For example, dropping a conference call can drop all individual participating calls. <A HREF="msgs_1xid.htm" tppabs="http://msdn.microsoft.com/library/psdk/tapi22/msgs_1xid.htm">LINE_CALLSTATE</A> messages are sent to the application for all calls whose call state is affected. A dropped call typically transitions to the <I>idle</I> state. Invoking <B>lineDrop</B> on a call in the <I>offering</I> state rejects the call. Not all telephone networks provide this capability. </P>
<P>A call in the <I>onholdpending</I> state typically reverts to the <I>connected</I> state. When dropping the consultation call to the third party for a conference call or when removing the third party in a previously established conference call, the provider (and switch) can release the conference bridge and revert the call back to a normal two-party call. If this is the case, <I>hConfCall</I> transitions to the <I>idle</I> state, and the only remaining participating call transitions to the <I>connected</I> state. Some switches automatically "unhold" the other call. </P>
<P>The application has the option to send user-user information at the time of the drop. Even if user-user information can be sent, there is no guarantee that the network will deliver this information to the remote party. </P>
<P>In various bridged or party-line configurations when multiple parties are on the call, <B>lineDrop</B> may not actually clear the call. For example, in a bridged situation, a <B>lineDrop</B> operation may not actually drop the call because the status of other stations on the call may govern; instead, the call may 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_790y.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_790y.htm'" tppabs="http://msdn.microsoft.com/library/psdk/tapi3/tapiovr2_790y.htm">Drop Overview</A>, <A HREF="javascript:if(confirm('http://msdn.microsoft.com/library/psdk/tapi3/tapiovr2_6sxe.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_6sxe.htm'" tppabs="http://msdn.microsoft.com/library/psdk/tapi3/tapiovr2_6sxe.htm">Terminate a Session 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> </P>
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