The scenario are ser 0.9.3 + sems 0.9.0 + mediaproxy + mysql, al instances are in the same machine The code in my ser.cfg if (!lookup("location")) { if ((method=="INVITE" || method=="ACK") && t_newtran() ) { acc_db_request("Llamada perdida","missed_calls"); if(!t_write_req("/tmp/am_fifo","voicemail")){ t_reply("500","Error contacting sems voicemail"); }; #t_reply("404", "Usuario no conectado"); break; }; } else if(method=="BYE" || method == "CANCEL"){ if(!t_write_req("/tmp/am_fifo","bye")){ t_reply("500","Error contacting sems"); }; }; sl_send_reply("404", "Usuario no encontrado"); break; setflag(3); when i call a offline user, the softphone make a call but I don't ear any message or received any notification, anyone can help me? this is /var/log/messages Nov 3 11:04:56 dns2 ser[23838]: Maxfwd module- initializing Nov 3 11:04:56 dns2 ser[23838]: INFO: udp_init: SO_RCVBUF is initially 110592 Nov 3 11:04:56 dns2 ser[23838]: INFO: udp_init: SO_RCVBUF is finally 262142 Nov 3 11:04:56 dns2 ser[23838]: INFO: udp_init: SO_RCVBUF is initially 110592 Nov 3 11:04:56 dns2 ser[23838]: INFO: udp_init: SO_RCVBUF is finally 262142 Nov 3 11:04:56 dns2 ser[23847]: INFO: fifo process starting: 23847 Nov 3 11:04:56 dns2 ser[23847]: SER: open_uac_fifo: fifo server up at /tmp/ser_fifo... Nov 3 11:05:07 dns2 ser[23848]: WARNING: t_reply: ACKs are not replied Nov 3 11:05:08 dns2 ser[23849]: WARNING: t_reply: ACKs are not replied Nov 3 11:05:10 dns2 ser[23851]: WARNING: t_reply: ACKs are not replied Nov 3 11:05:14 dns2 ser[23849]: WARNING: t_reply: ACKs are not replied Nov 3 11:05:23 dns2 mediaproxy[3158]: command delete 3924182bdc181a37 info= Nov 3 11:05:23 dns2 mediaproxy[3158]: command execution time: 0.20 ms