Stop Dialing Programatically In Android

Question

Hi, I am using the following code in android for dailing programatically.

try {
Intenet callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:123456789"));
startActivity(callIntent);
} catch (Exception exception)             

{ log.e("dialing-example", "Call failed", Exception); }

But how can i stop Dailing Programatically. i.e., how can i make end call.