[SR-Users] event_route[usrloc:contact-expired]

Hi there! I'm using Kamailio 4.4.3, and I add this code to my Kamailio: event_route[usrloc:contact-expired] {     xlog("L_INFO", "EXPIRED CONTACT START\n");     xlog("L_INFO", "EXPIRED CONTACT for $ulc(exp=>aor)\n");     xlog("L_INFO", "EXPIRED CONTACT END\n"); } I can't see this entries in the log. I read many times the docs and code, but I don't understand why it's not working. I have two phone with 60 and 300 expiry seconds, if then expire, when it's event_route[usrloc:contact-expired] triggered? Why this event route it's named as usrloc but it's documented in registrar module? I need to provide more info about? Thank you very much.