<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE task

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

<task xml:lang="en" id="GUID-1907CF0B-2F4B-50F6-B676-7B7059B7FF74"><title>Call Hold Tutorial </title><shortdesc>This tutorial describes how to place a call on hold with the telephony API for applications. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody> <steps id="GUID-579AD00E-9CCB-5C1E-85D7-D223535A4C7A"> <step id="GUID-BA54B3E5-B284-55C8-9709-082ADB8E1C5D"><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-B48E2268-6BFE-57A4-A46A-3913B65234BE"><cmd/><info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::GetCallDynamicCaps()</apiname></xref> to check if the device supports hold function </info> </step> <step id="GUID-15ADB36E-8D94-57EF-BBAA-6A7958A854CD"><cmd/><info>use <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::Hold()</apiname></xref> to place a call on hold </info> <info>Pass it the ID of the call to hold. The ID is the <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::TCallId</apiname></xref> returned when you dialled or answered the call. </info> </step> <step id="GUID-82771AAC-9CBA-5029-98DA-9D95552E90F4"><cmd/><info>pass the enumeration <xref href="GUID-97D402C8-B4B7-385A-92B3-D3FCC0CA575A.dita"><apiname>CTelephony::EHoldCancel</apiname></xref> to cancel the asynchronous request </info> </step> </steps> <example id="GUID-6068EFDB-D572-5D49-880E-FAF76EC44408"><title>Call hold example</title> <codeblock id="GUID-32D588C0-A809-5BC1-8DF4-1B9F494C19DE" xml:space="preserve">#include &lt;e32base.h&gt;

#include <Etel3rdParty.h>

class CClientApp : public CActive

    { 

private:

    CTelephony* iTelephony;

    CTelephony::TCallId iCallId;

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)

    {

    //default constructor

    }

TInt CClientApp::SomeFunction()

    {

    // Check that the phone supports holding calls.

    CTelephony::TCallCapsV1 callCapsV1;

    CTelephony::TCallCapsV1Pckg callCapsV1Pckg(callCapsV1);

    iTelephony->GetCallDynamicCaps(iCallId, callCapsV1Pckg);

    if( callCapsV1.iControlCaps & CTelephony::KCapsHold )

       {

       // The call represented by 'iCallId' can be put on hold

       iTelephony->Hold(iStatus, iCallId);

       SetActive();

       return KErrNone;

       }

    else

       {

       // The call cannot be put on hold; 

       // return an error indicate this.

       return KErrNotSupported;

       }

    }

void CClientApp::RunL()

    {

    if(iStatus==KErrNone)

       {} // The call has been held successfully;

    }

void CClientApp::DoCancel()

    {

    iTelephony->CancelAsync(CTelephony::EHoldCancel);

    }