code: public final boolean isRouteExternal(RouteHeader routeHeader) {
  		if (routeHeader != null) {
  			javax.sip.address.SipURI routeUri = (javax.sip.address.SipURI) routeHeader.getAddress().getURI();
  
  			String routeTransport = routeUri.getTransportParam();
  			if(routeTransport == null) {
  				routeTransport = ListeningPoint.UDP;
  			}
  			return isExternal(routeUri.getHost(), routeUri.getPort(), routeTransport);
  		}
  		return true;
  	}
docs: Check if the route is external
  @param routeHeader the route to check
  @return true if the route is external, false otherwise