[SR-Users] 404", "Not Found location"

Hi guys when i try to register i have route[LOCATION] that returns "404 Not Found location" due to this statement: $avp(oexten) = $rU; if (!lookup("location")) { $var(rc) = $rc; route(TOVOICEMAIL); t_newtran(); switch ($var(rc)) { case -1: case -3: send_reply("404", "Not Found location"); exit; case -2: send_reply("405", "Method Not Allowed"); exit; } } thats weird i did follow ubuntu realtime trying to get sip account registered and then uac_req_send to asterisk but the first step already failed. :-( i noticed there is no Username in my RURI (whatever UAC i am using) maybe this is the root of evil please find attache my kamailio.cfg i am using kamailio v 4.4 Any idea very welcome