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Hello, First of all thaks to Kraus for his quick reply on my last question. However I can't do openser work fine. I'm trying to use failure_route as follows, can anybody tell me which could be the problem?? (...) modparam("tm", "fr_inv_timer" , 10) # timer for response to a request modparam("tm","fr_timer", 4) # ------------------------- request routing logic ------------------- # main routing logic route{ (...) if (uri==myself) { (...) # Redirecciono cap a l'asterisk si marquen una extensió que comença per 3 if(uri=~"sip:2[0-9]+@" && method=="INVITE") { t_on_failure("1"); } (...) route(1); } route[1] { # send it out now; use stateful forwarding as it works reliably # even for UDP2TCP if (!t_relay()) { sl_reply_error(); }; exit; } failure_route[1]{ rewritehostport("172.16.51.160"); #asterisk rewriteuser("2002"); append_branch(); t_relay(); exit; } With this openser.cfg the call is cancelled after fr_inv_timer and failure_route[1] doesn't work but, however, if I do this: route{ (...) if (uri==myself) { (...) # Redirecciono cap a l'asterisk si marquen una extensió que comença per 3 if(uri=~"sip:2[0-9]+@" && method=="INVITE") { à rewritehostport("172.16.51.160"); #asterisk à rewriteuser("2002"); t_relay(); exit; } (...) route(1); } If I use this the call is redirected to my asterisk but using the failure_route as my first openser.cfg it does't work. Which is my problem?? Thanks....