[Serusers] BYE - Messages and asterisk

Hello, I've ser running on 192.168.1.222:5061 and asterisk on 192.168.1.222:5060 and I want to forward international calls to asterisk. I'm writing a small accounting application and I need the methods "ACK" and "BYE". Here a part of my ser.cfg: if (method=="INVITE") { # authenticated and authorized, now accounting is set setflag(1); record_route(); }; if (loose_route()) { # mark the BYEs -- they are requests within a dialog if(method=="BYE") setflag(1); t_relay(); break; }; if (uri=~"sip:00") { rewritehostport("192.168.1.222:5060"); //to asterisk... } else { sl_send_reply("404", "Not Found"); break; }; append_hf("P-hint: GATEWAY\r\n"); if (!t_relay()) { sl_reply_error(); break; }; Why don't I get the BYE messages?? I think I made it like it's written in the documentation Thanks! Sebastian