CallBlocking: I want to show response as CALL WAITING instead of ending to the caller added to black list.

CallBlocking: I want to show response as CALL WAITING instead of ending to the caller added to black list. Below is the piece of code. How to change to call waiting instead of ending call as shown in bold


public class CallReceiver extends BroadcastReceiver
{
..
..
@Override
public void onReceive(Context context, Intent intent)
{
..
..
..
com.android.internal.telephony.ITelephony telephonyServiceTmp = (ITelephony) m.invoke(tm);
telephonyServiceTmp.endCall();