Hello; it is applied after t_relay() or msg_apply() functions. you can try it like $var(fufix)=$fU; $fU=$(var(fufix){s.substr,2,0}); -- View this message in context: http://sip-router.1086192.n5.nabble.com/modifying-fu-fU-R-URI-From-tp141949p141957.html Sent from the Users mailing list archive at Nabble.com.