/**
  * Fired when a call ends
  *
  * @param evt CallEvent
  */
 public void callEnded(CallEvent evt) {
   AudioMediaSession audioMediaSession = evt.getSourceCall().getAudioMediaSession();
   if (audioMediaSession != null) {
     audioMediaSession.close();
   }
   VideoMediaSession videoMediaSession = evt.getSourceCall().getVideoMediaSession();
   if (videoMediaSession != null) {
     videoMediaSession.stopTrasmit();
     videoMediaSession.stopReceive();
   }
 }
 /**
  * Fired when a call is received
  *
  * @param evt CallEvent
  */
 public void callReceived(CallEvent evt) {
   try {
     Call call = evt.getSourceCall();
     Interlocutor interlocutor = new Interlocutor();
     interlocutor.setCall(call);
     guiManager.addInterlocutor(interlocutor);
     call.addStateChangeListener(this);
     // handleAnswerRequest(interlocutor);
   } catch (Exception e) {
     Log.error("callReceived", e);
   }
 }