code: @Override
  	public void stop() {		
  		super.stop();
  		try {
  			sipCache.stop();
  		} catch (Exception e) {
  			getStackLogger().logError("Unable to stop the SipCache", e);
  		}
  		if(loadBalancerHeartBeatingService != null) {
  			loadBalancerHeartBeatingService.stop();
  		}
  	}
docs: /*
  (non-Javadoc)
  @see gov.nist.javax.sip.SipStackImpl#stop()