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<task id="GUID-E2AF923A-D796-5DA9-B678-C6E2ABF7A6CC" xml:lang="en"><title>Call

Completion to Busy Subscriber Tutorial</title><shortdesc>This tutorial describes how to get the Call Completion to Busy

Subscriber (CCBS) supplementary service information from the network. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>

<context><p>GSM network (CCBS) supplementary service repeatedly calls a destination

that is busy at the time of the initial call attempt.</p><p>The <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>RMobilePhone</apiname></xref> methods

are at phone-level because the mobile station must interrogate the network

for the status of all CCBS requests at once. Each CCBS subscriber can have

up to five CCBS requests outstanding at a time.  

</p><p/><p>The high level steps to get the CCBS information are shown here:

</p></context>

<steps id="GUID-53D0919A-7B45-5DAA-A58E-E717FCF94F06">

<step id="GUID-4C86EF37-6EB1-5463-A79F-1EAF52DF53BC"><cmd>Get the current

status of the CCBS service using <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>RMobilePhone::GetCCBSStatus()</apiname></xref>. </cmd>

<info>Status is described by <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>RMobilePhone::TMobilePhoneCCBSStatus</apiname></xref>. </info>

</step>

<step id="GUID-28C7BCA8-C0C3-5AE5-A883-5545B3135D41"><cmd>Use <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>RMobilePhone::NotifyCCBSStatusChange()</apiname></xref> to

get the notification of any changes in the status of the CCBS service. </cmd>

</step>

<step id="GUID-48C0C143-6AB9-5231-AE00-F23E1FB82C3B"><cmd>Deactivate all CCBS

requests using <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>RMobilePhone::DeactivateCCBS()</apiname></xref>  </cmd>

</step>

<step id="GUID-FC7666E8-49C8-53EA-877B-59A6BA9D591A"><cmd>Get a list of active

CCBS requests using <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>CRetrieveMobilePhoneCcbsList</apiname></xref>. </cmd>

<info>The list of active CCBS requests is a <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>CMobilePhoneCcbsList</apiname></xref> object

that contains: </info>

<substeps id="GUID-0EE16687-BBCB-4B88-BE49-ABFD930EC4E5">

<substep id="GUID-AD3D87FD-73EB-47F8-8809-57BDB2E99A2E"><cmd/>

<info>0 or more <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>RMobilePhone::TMobilePhoneCCBSEntryV1</apiname></xref> objects

for each request </info>

</substep>

<substep id="GUID-FA73FFA0-A911-4256-9A83-5AEF5C9253A0"><cmd/>

<info>the name of the call that represents the CCBS request </info>

</substep>

<substep id="GUID-07733205-6808-457F-9250-78F6F939D21E"><cmd/>

<info>the service group </info>

</substep>

<substep id="GUID-490C5986-3D8A-4D3A-B8A9-269EB482A0F9"><cmd/>

<info>a network-allocated index number </info>

</substep>

<substep id="GUID-AA835788-558E-4685-9CED-2FEDF2166468"><cmd/>

<info>the phone number of the remote party </info>

</substep>

</substeps>

</step>

</steps>

<example><title>CCBS example</title> <p>The following code gets the list of

active CCBS requests and prints the remote number for each. </p> <p>The code

assumes <codeph>iMobilePhone</codeph> is an <xref href="GUID-AA81AFA4-6FAC-3B0D-A082-BE0AEC58CCA8.dita"><apiname>RMobilePhone</apiname></xref> object. </p> <codeblock id="GUID-33E4DB3B-EE3F-5186-B01F-AF9DD4760ACF" xml:space="preserve">void CClientApp::CCBSL()

    {

    // Create and start CCBS retriever

    CRetrieveMobilePhoneCcbsList* retrieveCCBSList = CRetrieveMobilePhoneCcbsList::NewL(iMobilePhone);

    CleanupStack::PushL(retrieveCCBSList);

    TRequestStatus status;

    retrieveCCBSList->Start(status);

    User::WaitForRequest(status);

    User::LeaveIfError(status.Int());

    // Get the list of active CCBS requests

    CMobilePhoneCcbsList* ccbsList = retrieveCCBSList->RetrieveListL();

    CleanupStack::PushL(ccbsList);

    // Print each remote number for which a CCBS request is active

    TInt nEntries = ccbsList->Enumerate();

    RMobilePhone::TMobilePhoneCCBSEntryV1 ccbsEntry;

    for (TInt i=0; i<=nEntries; i++)

        {

         ccbsEntry = ccbsList->GetEntryL(i);

         console->Printf(_L("CCBS request to %S active\n"), ccbsEntry.iDestination.iTelNumber);

        }

    // Clean up

    CleanupStack::PopAndDestroy(2); // ccbsList, retrieveCCBSList    

    }

</codeblock> </example>

</taskbody><related-links>

<link href="GUID-2318B1DC-D258-5BA2-90C0-5DF368D80933.dita"><linktext>Multimode

lists</linktext></link>

<link href="GUID-0B743C31-9B99-54A0-AF7B-22AFA823101B.dita"><linktext>CCBS Control

Tutorial</linktext></link>