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  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">

<task id="GUID-42B10CBF-D45A-580F-A639-E2495FF3B4F3" xml:lang="en"><title>Remote

Call Termination Tutorial </title><shortdesc>This tutorial describes how to detect when a caller at the remote

end of the connection has terminated a call with the telephony API for applications. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>

<context><p><codeph>CTelephony</codeph> represents the status of your calls

with a <codeph>CTelephony::TCallStatus</codeph> Possible status values include <i>Idle</i>, <i>Ringing</i>, <i>On-Hold</i>.</p><ul>

<li><p>When a call status changes from </p><codeph>CTelephony::EStatusConnected </codeph> to <codeph>CTelephony::EStatusIdle</codeph> then

the call has terminated. </li>

<li><p>When a call status changes from </p><codeph>CTelephony::EStatusHold

 </codeph> to <codeph>CTelephony::EStatusIdle</codeph> then the call has terminated. </li>

</ul><p>The method starts an asynchonous operation that completes when the

calls's status changes. At this point, the call's new status is written into

the <codeph>CTelephony::TCallStatusV1Pckg</codeph>.</p></context>

<steps id="GUID-AA3B542C-797F-56C7-A6B6-8218FAFBB5D2">

<step id="GUID-9DE15571-A8FC-5101-A597-EA03F1BED4AC"><cmd/>

<info>create a new instance of <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony</apiname></xref>. </info>

</step>

<step id="GUID-AE2D9BB9-A111-572A-9720-44DAD351FEE1"><cmd/>

<info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::NotifyChange()</apiname></xref> to

detect changes in the voice line status. </info>

<info>Pass a <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::EOwnedCall1StatusChange</apiname></xref> to

detect a change in call 1, and pass it <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::EOwnedCall2StatusChange</apiname></xref> for

call 2. Also pass an empty <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::TCallStatusV1Pckg</apiname></xref>. </info>

</step>

<step id="GUID-57B7B41E-8A8D-500C-86A2-6EB75D8E06A6"><cmd/>

<info>pass the enumeration <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::EOwnedCall1StatusChangeCancel</apiname></xref> to

cancel the request for call1 notification and <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::EOwnedCall2StatusChangeCancel </apiname></xref> for

call2 notification. </info>

</step>

</steps>

<example id="GUID-8255D372-823D-52D0-9082-4EF7E7808A83"><title>Remote call

termination example</title> <codeblock id="GUID-4E422327-E0AF-5C97-A09E-5A241E25D679" xml:space="preserve">#include &lt;e32base.h&gt;

#include <Etel3rdParty.h>

class CClientApp : public CActive

    { 

private:

    CTelephony* iTelephony;

    CTelephony::TCallId iCallId;

                CTelephony::TCallStatusV1 iCallStatusV1;

                CTelephony::TCallStatusV1Pckg iCallStatusV1Pckg;

    CTelephony::TNotificationEvent iEvent;

public:

    CClientApp(CTelephony* aTelephony, CTelephony::TCallId aCallId);

    TInt SomeFunction();

private:

    /*

       These are the pure virtual methods from CActive that  

       MUST be implemented by all active objects

       */

    void RunL();

    void DoCancel();

   };

CClientApp::CClientApp(CTelephony* aTelephony, CTelephony::TCallId aCallId)

    : CActive(EPriorityStandard),

      iTelephony(aTelephony),

      iCallId(aCallId),

      iCallStatusV1Pckg(iCallStatusV1)

    {

    //default constructor

    }

TInt CClientApp::SomeFunction()

    {

    switch(iCallId)

       {

       case CTelephony::EISVCall1:

          iEvent = CTelephony::EOwnedCall1StatusChange;

          break;

       case CTelephony::EISVCall2:

          iEvent = CTelephony::EOwnedCall2StatusChange;

          break;

       default:

          // We have not been given a valid call ID, so return an error

          return KErrArgument;

       }

    iTelephony->NotifyChange(iStatus, iEvent, iCallStatusV1Pckg);

    SetActive();

    return KErrNone;

    }

void CClientApp::RunL()

    {

    if(iStatus==KErrNone)

       {

       // The status of the call has changed.

       if(iCallStatusV1.iStatus == CTelephony::EStatusIdle)

          {

          // The call has been terminated.

          }

       else

          {

          // The call has not yet been terminated, so request notification again

          iTelephony->NotifyChange(iStatus, iEvent, iCallStatusV1Pckg);

          SetActive();

          }

       }

    }

void CClientApp::DoCancel()

    {

    CTelephony::TCancellationRequest cancelRequest;

    if(iCallId == CTelephony::EISVCall1)

       {

       cancelRequest = CTelephony::EOwnedCall1StatusChangeCancel;

       }

    else // iCallId == CTelephony::EISVCall2

       {

       cancelRequest = CTelephony::EOwnedCall2StatusChangeCancel;

       }

    iTelephony->CancelAsync(cancelRequest);

    }</codeblock> </example>

</taskbody></task>