[Serusers] Can´t CANCEL PSTN calls when using credentials

HI I have this problem when I made a call from a registered endpoint to a PSTN number through a GW AS5350 I can´t cancel this call and destination keeps ringing until timeout occur; this happen only when I use "is_user_in" function before to forward the call. some idea??? ser.cfg<::: .... if (uri==myself) { if (method == "REGISTER") { log(1, "ANALYZING REGISTER REQUEST\n"); # to use digest authentication if (!www_authorize("mydomain.com.pe", "subscriber")) { www_challenge("mydomain.com.pe", "0"); break; }; if (!save("location")) { sl_reply_error(); }; break; }; if (method == "INVITE" && src_ip!=GW_AS5350_IP) { log(1, "ANALYZING INVITE REQUEST\n"); if (!proxy_authorize("mydomain.com.pe", "subscriber")) { proxy_challenge("mydomain.com.pe", "0"); break; } else if (is_user_in("credentials", "deactivated")) { sl_send_reply("402", "Su cuenta fue desactivada"); break; }; }; /* ***************** Dial out to Local and PSTN logic ****************** */ # forward n digit requests to gateway AS5350 (Celulares) if(uri=~"^sip:9"){ log(1," digit expression match - Celulares"); if (!is_user_in("credentials", "mobile")) { sl_send_reply("403", "No permission for mobile calls"); break; }; rewritehostport("GW_AS5350_IP:5060"); route(1); ## to NatHelper l... break; }; # Forward calls to 6607+ to Asterisk OH323 Module gk´s if(uri=~"^sip:6607[0-9][0-9][0-9]*@(mydomain\.com\.pe)"){ rewritehostport("Asterisk-IP:5060"); log(1,"digit expression match - Local (oH323)"); route(2); break; }; ..... . . . -- rrgv