code: void handleQueueMemberStatusEvent(QueueMemberStatusEvent event)
      {
          AsteriskQueueImpl queue = getInternalQueueByName(event.getQueue());
  
          if (queue == null)
          {
              logger.error("Ignored QueueMemberStatusEvent for unknown queue " + event.getQueue());
              return;
          }
  
          AsteriskQueueMemberImpl member = queue.getMemberByLocation(event.getLocation());
          if (member == null)
          {
              logger.error("Ignored QueueMemberStatusEvent for unknown member " + event.getLocation());
              return;
          }
  
          manageQueueMemberChange(queue, member, event);
          queue.fireMemberStateChanged(member);
      }
docs: Challange a QueueMemberStatusEvent. Called from AsteriskServerImpl
  whenever a member state changes.
  
  @param event that was triggered by Asterisk server.