code: public boolean addFailOverListener(FailOverListener localListener) {
  		if (logger.isDebugEnabled()) {
  			logger.debug("Adding local listener " + localListener);
  		}
  		for(FailOverListener failOverListener : failOverListeners) {
  			if (failOverListener.getBaseFqn().getFqn().equals(localListener.getBaseFqn().getFqn())) {
  				return false; 
  			}
  		}
  		return failOverListeners.add(localListener);		
  	}
docs: /*
  (non-Javadoc)
  @see MobicentsCluster#addFailOverListener(FailOverListener)