[Serusers] Return code 481 & mediaproxy

I have a SER box which receives a 481 'Call Leg Does Not Exist' sometimes when using SER + Mediaproxy after a 'BYE' is received. I'd say about half the time I see this 481, the rest I see 200 (the last_method is BYE in either case). Though the source is using public IP's, I must use mediaproxy else I lose the audio after 15 seconds or so. The config was adapted from one found in the onsip.org guide, but depends on 'exec_dset()' for routing. Any suggestions would be appreciated. I've attached the config. # # debug=5 fork=yes log_stderror=yes listen=xxx.xxx.xxx.xxx port=5060 children=8 dns=no rev_dns=no fifo="/tmp/ser_fifo" fifo_db_url="mysql://user:password@localhost/ser" loadmodule "/usr/local/lib/ser/modules/mysql.so" loadmodule "/usr/local/lib/ser/modules/sl.so" loadmodule "/usr/local/lib/ser/modules/tm.so" loadmodule "/usr/local/lib/ser/modules/rr.so" loadmodule "/usr/local/lib/ser/modules/maxfwd.so" loadmodule "/usr/local/lib/ser/modules/usrloc.so" loadmodule "/usr/local/lib/ser/modules/registrar.so" loadmodule "/usr/local/lib/ser/modules/auth.so" loadmodule "/usr/local/lib/ser/modules/auth_db.so" loadmodule "/usr/local/lib/ser/modules/uri.so" loadmodule "/usr/local/lib/ser/modules/uri_db.so" loadmodule "/usr/local/lib/ser/modules/xlog.so" loadmodule "/usr/local/lib/ser/modules/mediaproxy.so" loadmodule "/usr/local/lib/ser/modules/domain.so" loadmodule "/usr/local/lib/ser/modules/nathelper.so" loadmodule "/usr/local/lib/ser/modules/textops.so" loadmodule "/usr/local/lib/ser/modules/exec.so" modparam("auth_db|uri_db|usrloc", "db_url", "mysql://user:password@localhost/ser") modparam("auth_db", "calculate_ha1", 1) modparam("auth_db", "password_column", "password") modparam("nathelper", "rtpproxy_disable", 1) modparam("nathelper", "natping_interval", 0) modparam("mediaproxy","natping_interval", 30) modparam("mediaproxy","mediaproxy_socket", "/var/run/mediaproxy.sock") modparam("mediaproxy","sip_asymmetrics","/usr/local/etc/ser/sip-clients") modparam("mediaproxy","rtp_asymmetrics","/usr/local/etc/ser/rtp-clients") modparam("usrloc", "db_mode", 2) modparam("registrar", "nat_flag", 6) modparam("rr", "enable_full_lr", 1) route { # ----------------------------------------------------------------- # Sanity Check Section # ----------------------------------------------------------------- if (!mf_process_maxfwd_header("10")) { sl_send_reply("483", "Too Many Hops"); break; }; if (msg:len > max_len) { sl_send_reply("513", "Message Overflow"); break; }; # ----------------------------------------------------------------- # Record Route Section # ----------------------------------------------------------------- if (method=="INVITE" && client_nat_test("3")) { xlog("L_INFO", "DEBUG: record_route_preset \n"); record_route_preset("xxx.xxx.xxx.xxx:5060;nat=yes"); } else if (method!="REGISTER") { xlog("L_INFO", "DEBUG: record_route \n"); record_route(); }; # ----------------------------------------------------------------- # Call Tear Down Section # ----------------------------------------------------------------- if (method=="BYE" || method=="CANCEL") { xlog("L_INFO","DEBUG: Tear Down %rm\n"); end_media_session(); }; # ----------------------------------------------------------------- # Loose Route Section # ----------------------------------------------------------------- if (loose_route()) { xlog("L_INFO","DEBUG: loose route\n"); if (has_totag() && (method=="INVITE" || method=="ACK")) { if (client_nat_test("3") || search("^Route:.*;nat=yes")) { setflag(6); use_media_proxy(); }; }; # route(1); t_relay(); break; }; # ----------------------------------------------------------------- # Call Type Processing Section # ----------------------------------------------------------------- xlog("L_INFO","DEBUG: Call Type processin\n"); if (uri!=myself) { route(1); break; }; if (uri==myself) { if (method=="CANCEL") { xlog("L_INFO","DEBUG: URI==myself %rm\n"); route(2); break; } else if (method=="INVITE") { route(2); break; }; # lookup("aliases"); # if (uri!=myself) { # route(1); # break; # }; # if (!lookup("location")) { # sl_send_reply("404", "User Not Found"); # break; # }; }; route(1); } route[1] { # ----------------------------------------------------------------- # Default Message Handler # ----------------------------------------------------------------- xlog("L_INFO","DEBUG: ROUTE [1]\n"); t_on_reply("1"); exec_dset("/ser/sql3.php 0 "); if (!t_relay()) { if (method=="INVITE" || method=="ACK") { end_media_session(); }; xlog("L_INFO","DEBUG: Send sl_reply_error\n"); sl_reply_error(); }; } route[2] { # ----------------------------------------------------------------- # CANCEL and INVITE Message Handler # ----------------------------------------------------------------- xlog("L_INFO","DEBUG: ROUTE [3]\n"); if (client_nat_test("3")) { xlog("L_INFO","DEBUG: ROUTE [3] client_nat_test true\n"); setflag(7); force_rport(); fix_nated_contact(); }; lookup("aliases"); if (uri!=myself) { xlog("L_INFO","DEBUG: ROUTE [3] uri!=myself true\n"); route(1); break; }; # if (!lookup("location")) { # xlog("L_INFO","DEBUG: ROUTE [3] !lookup(location) true\n"); # sl_send_reply("404", "User Not Found"); # break; # }; if (method=="CANCEL") { xlog("L_INFO","DEBUG: ROUTE [3] CANCEL true\n"); route(1); break; }; # if (!proxy_authorize("","subscriber")) { # proxy_challenge("","0"); # break; # } else if (!check_from()) { # sl_send_reply("403", "Use From=ID"); # break; # }; # consume_credentials(); if (isflagset(6) || isflagset(7)) { use_media_proxy(); }; route(1); } onreply_route[1] { xlog("L_INFO","DEBUG: ROUTE [onreply_route]\n"); if ((isflagset(6) || isflagset(7)) && (status=~"(180)|(183)|2[0-9][0-9]")) { if (!search("^Content-Length:\ +0")) { use_media_proxy(); }; }; if (client_nat_test("1")) { fix_nated_contact(); }; }