title: Managing 2 conferences with Voximplant scenario
body: <p>I am trying to make conference with Voximplant, and when user makes a call to another user, while the call is still going on, it  makes another call to another user making two calls and the callees is added to a video conferencing.
  But it seems the caller is billed twice and the scenerio doesnt look optimised. What should i do to bill once and optimize it?</p>
  <p>Scenario:</p>
  <pre><code>require(Modules.Conference);
  var call, conf = null;
  VoxEngine.addEventListener(AppEvents.Started, handleConferenceStarted);
  function handleConferenceStarted(e) {
      // Create 2 conferences right after session to manage audio in the right way
      if( conf === null ){
       conf = VoxEngine.createConference(); // create conference
      }
      conf.addEventListener(CallEvents.Connected,function(){
         Logger.write('Conference started')
      })
  
  
  }
    VoxEngine.addEventListener(AppEvents.CallAlerting, function(e) {
  
      e.call.addEventListener(CallEvents.Connected, handleCallConnected);
  
      let new_call = VoxEngine.callUser(e.destination,e.callerid,e.displayName,{},true)
      new_call.addEventListener(CallEvents.Connected,handleCallConnected);
      e.call.answer();
  
  });
  
  function handleCallConnected(e) {
    Logger.write('caller connected');
    conf.add({
        call: e.call,
        mode: &quot;FORWARD&quot;,
        direction: &quot;BOTH&quot;, scheme: e.scheme
       });
  
  }
  </code></pre>