public boolean startRinging(Call foregroundCall, boolean isHfpDeviceAttached) {
    //cczhegn add return for customer self control ringing, system ignore
         if (true) {
            return ;
         }
        if (foregroundCall == null) {
            /// M: ALPS03787956 Fix wtf log warning. @{
            /// Hand up the call immediately when ringing. Then the foreground call will
            /// change to null, but call audio is start ringing at the same time.
            /// Log.wtf will occur in this case.
            /// Solution:
            /// Call audio can handle this case, so change Log.wtf to Log.i here.
            Log.i(this, "startRinging called with null foreground call.");
            /// @}
            return false;
        }
        AudioManager audioManager =
                (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
        boolean isVolumeOverZero = audioManager.getStreamVolume(AudioManager.STREAM_RING) > 0;
        boolean shouldRingForContact = shouldRingForContact(foregroundCall.getContactUri());
        boolean isRingtonePresent = !(mRingtoneFactory.getRingtone(foregroundCall) == null);
        boolean isSelfManaged = foregroundCall.isSelfManaged();
      ....
}
public void stopRinging() {
        //cczheng add return for customer self control ringing, system ignore
         if (true) {
            return ;
         }
        if (mRingingCall != null) {
            Log.addEvent(mRingingCall, LogUtils.Events.STOP_RINGER);
            mRingingCall = null;
        }
        if (mIsVibrating) {
            Log.addEvent(mVibratingCall, LogUtils.Events.STOP_VIBRATOR);
            mVibrator.cancel();
            mIsVibrating = false;
            mVibratingCall = null;
        }
    }

public class RingUtil {
    private static final String TAG = "RingUtil";
    private static Ringtone ringtone;
    private static Ringtone getRing(Context context){
        if (null == ringtone){
            Uri defaultRingtoneUri = RingtoneManager.getActualDefaultRingtoneUri(context, RingtoneManager.TYPE_RINGTONE);
            ringtone = RingtoneManager.getRingtone(context, defaultRingtoneUri);
        }
        return ringtone;
    }
    public static void startRing(Context context){
        getRing(context);
        if (!ringtone.isPlaying()){
            ringtone.play();
        }
    }
    public static void stopRing(Context context){
        getRing(context);
        if (ringtone.isPlaying()){
            ringtone.stop();
        }
    }
}

//来电拉起 InCallActivity 的地方
public void showInCall(boolean showDialpad, boolean newOutgoingCall) {
    LogUtil.d("InCallPresenter.showInCall", "Showing InCallActivity");
    //cczheng  annotaion don't show sysytem InCallActivity
    //mContext.startActivity(
        //InCallActivity.getIntent(
            //mContext, showDialpad, newOutgoingCall, false /* forFullScreen */));
  }
//去电拉起 InCallActivity 的地方
public void maybeStartRevealAnimation(Intent intent) {
    LogUtil.e("InCallPresenter.OutgoingCall", "maybeStartRevealAnimation");
    if (intent == null || mInCallActivity != null) {
      return;
    }
    final Bundle extras = intent.getBundleExtra(TelecomManager.EXTRA_OUTGOING_CALL_EXTRAS);
    if (extras == null) {
      // Incoming call, just show the in-call UI directly.
      return;
    }
    if (extras.containsKey(android.telecom.Call.AVAILABLE_PHONE_ACCOUNTS)) {
      // Account selection dialog will show up so don't show the animation.
      return;
    }
    final PhoneAccountHandle accountHandle =
        intent.getParcelableExtra(TelecomManager.EXTRA_PHONE_ACCOUNT_HANDLE);
    final Point touchPoint = extras.getParcelable(TouchPointManager.TOUCH_POINT);
    InCallPresenter.getInstance().setBoundAndWaitingForOutgoingCall(true, accountHandle);
    //cczheng  annotaion don't show sysytem InCallActivity
    LogUtil.e("InCallPresenter.OutgoingCall", "OutgoingCall is preper start inCallActivity.");
    //final Intent activityIntent =
        //InCallActivity.getIntent(mContext, false, true, false /* forFullScreen */);
    //activityIntent.putExtra(TouchPointManager.TOUCH_POINT, touchPoint);
    //mContext.startActivity(activityIntent);
  }

@RequiresPermission(Manifest.permission.READ_PHONE_STATE)
  public void updateNotification(CallList callList) {
    ///cczheng annotaion for don't show incallnotification when pstnoverlayactivity in font
    //updateInCallNotification(callList);
  }

private PendingIntent createCallLogPendingIntent(UserHandle userHandle) {
    //cczheng add for jump to customer app
    try {
            Intent intentc = mContext.getPackageManager().getLaunchIntentForPackage("your customer app packageName");
          return PendingIntent.getActivity(mContext, 11, intentc, 0);
        }catch (Exception e){
             e.printStackTrace();
      Intent intent = new Intent(Intent.ACTION_VIEW, null);
          intent.setType(Calls.CONTENT_TYPE);
          TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(mContext);
          taskStackBuilder.addNextIntent(intent);
          return taskStackBuilder.getPendingIntent(0, 0, null, userHandle);
        }
    }