[Serusers] loose_route question

Hi, I would like to understand a little bit better the "loose route" concept. I have seen 2 different configs for ser: Sometimes the config has just: loose_route(); ...and sometimes it has: if (loose_route()) { t_relay(); break; }; How exactly do these 2 differ? The README says: "The function performs loose routing as defined in RFC3261", but why would I put a t_relay() after checking for loose_route()? What I can tell so far is that loose routing leaves the next hop in the Route header, but I don't understand which one of the above two examples actually tell SER to do that. Thanks, Ricardo Villa