I am trying to use the UAC module in conjunction with a gateway that requires authentication. I am getting the following when trying to dial a number that gets sent to the gateway: ERROR: t_newtran: transaction already in process Prior to this the following are written to the log file: international PSTN match resetflag(9) host rewritten What seems to be happening is that the t_relay_to_udp is being called and the gateway is contacted but before any reply is received openser is throwing a t_newtran error. My config file is as follows: <snip> route { # ----------------------------------------------------------------- # Sanity Check Section # ----------------------------------------------------------------- if (!mf_process_maxfwd_header("10")) { sl_send_reply("483", "Too Many Hops"); return; }; if (msg:len > max_len) { sl_send_reply("513", "Message Overflow"); return; }; # ----------------------------------------------------------------- # Record Route Section # ----------------------------------------------------------------- if (method=="INVITE" && client_nat_test("3")) { record_route_preset("60.000.000.000:5060;nat=yes"); # insert IP address } else if (method!="REGISTER") { record_route(); }; # ----------------------------------------------------------------- # Call Tear Down Section # ----------------------------------------------------------------- if (method=="BYE" || method=="CANCEL") { setflag(1); end_media_session(); }; # ----------------------------------------------------------------- # Loose Route Section # ----------------------------------------------------------------- if (loose_route()) { if (has_totag() && (method=="INVITE" || method=="ACK")) { if (client_nat_test("3") || search("^Route:.*;nat=yes")) { setflag(6); use_media_proxy(); }; }; route(1); return; }; # ----------------------------------------------------------------- # Call Type Processing Section # ----------------------------------------------------------------- if (uri!=myself) { route(5); route(1); return; }; if (uri==myself) { if (method=="ACK") { route(6); return; } else if (method=="CANCEL") { route(1); return; } else if (method=="INVITE") { route(3); return; } else if (method=="REGISTER") { route(2); return; }; lookup("aliases"); if (uri!=myself) { route(5); route(1); return; }; if (!lookup("location")) { sl_send_reply("404", "User Not Found"); return; }; }; route(1); } route[1] { # ----------------------------------------------------------------- # Default Message Handler # ----------------------------------------------------------------- t_on_reply("1"); if (!t_relay()) { if (method=="INVITE" || method=="ACK") { end_media_session(); }; sl_reply_error(); }; } route[2] { # ----------------------------------------------------------------- # REGISTER Message Handler # ---------------------------------------------------------------- sl_send_reply("100", "Trying"); log(1,"route[2] (Register handler"); if (!search("^Contact: \*") && client_nat_test("7")) { setflag(6); fix_nated_register(); force_rport(); }; if (!www_authorize("","subscriber")) { www_challenge("","0"); return; }; if (!check_to()) { sl_send_reply("401", "Unauthorized"); return; }; consume_credentials(); if (!save("location")) { sl_reply_error(); }; } route[3] { # ----------------------------------------------------------------- # INVITE Message Handler # ----------------------------------------------------------------- if (client_nat_test("3")) { setflag(7); force_rport(); fix_nated_contact(); }; if (!allow_trusted() && !is_uri_host_local()) { if (!proxy_authorize("","subscriber")) { proxy_challenge("","0"); return; } else if (!check_from()) { sl_send_reply("403", "Use From=ID"); return; }; consume_credentials(); }; lookup("aliases"); if (uri!=myself) { route(5); route(1); return; }; if (uri=~"^sip:[+|00|011][0-9]*@") { # International PSTN log(1,"international PSTN match"); route(4); return; }; if (!lookup("location")) { if (uri=~"^sip:[0-9]{11}@") { # Domestic(US) PSTN # route(4); return; }; sl_send_reply("404", "User Not Found"); return; }; if (method=="CANCEL") { route(1); return; }; setflag(1); setflag(3); route(5); route(1); } route[4] { # ----------------------------------------------------------------- # PSTN Handler # ----------------------------------------------------------------- #UAC module routing# t_on_failure("1"); resetflag(9); log(1,"resetflag(9)"); t_relay_to_udp("203.100.100.100","5060"); #PSTN gateway log(1,"host rewritten"); avp_write("i:45", "inv_timeout"); setflag(1); setflag(3); route(5); route(1); } route[5] { # ----------------------------------------------------------------- # RTP Proxy Enabler # ----------------------------------------------------------------- if (isflagset(6) || isflagset(7)) { use_media_proxy(); }; } route[6] { # ------------------------------------------------------------------------ # ACK Handler # ------------------------------------------------------------------------ # ------------------------------------------------------------------------ # Aliases Section # ------------------------------------------------------------------------ lookup("aliases"); if (uri!=myself) { route(5); route(1); return; }; lookup("location"); route(1); } onreply_route[1] { 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(); }; } failure_route[1] { log(1,"hit failure_route[1]"); if (t_check_status("401|407")) { log(1,"status is 401 or 407"); if (isflagset(9)) { log(1,"flag9 is set"); t_reply("503","Authentication failed"); return; } if (uac_auth()) { log(1, "called uac_auth"); setflag(9); t_on_failure("1"); append_branch(); t_relay(); } } } The SIP traffic is as follows: U 192.168.0.50:5060 -> 192.168.0.6:5060 INVITE sip:021555222@domain.co.nz SIP/2.0..Via: SIP/2.0/UDP 192.168.0.5 0:5060;rport;branch=z9hG4bK29BECBA8F97C4648A1E027E5DF93BEC0..From: Cameron local Domain <sip:6494466546@domain.co.nz>;tag=3738281931..To: <sip :021555222@domain.co.nz>..Contact: <sip:6494466546@192.168.0.50:5060>.. Call-ID: B1402DE5-6390-4715-A03F-9B1F78AB60CF@192.168.0.50..CSeq: 28000 INV ITE..Proxy-Authorization: Digest username="6494466546",realm="domain.co .nz",nonce="44329b8ecd24c22c48293896310ed7d403738b94",response="014bc155e1a 3554039f6688e9d1e8d42",uri="sip:021555222@domain.co.nz"..Max-Forwards: 70..Content-Type: application/sdp..User-Agent: X-Lite release 1103m..Conten t-Length: 301....v=0..o=6494466546 766866495 766868168 IN IP4 192.168.0.50. .s=X-Lite..c=IN IP4 192.168.0.50..t=0 0..m=audio 8000 RTP/AVP 0 8 3 98 97 1 01..a=rtpmap:0 pcmu/8000..a=rtpmap:8 pcma/8000..a=rtpmap:3 gsm/8000..a=rtpm ap:98 iLBC/8000..a=rtpmap:97 speex/8000..a=rtpmap:101 telephone-event/8000. .a=fmtp:101 0-15.. #### U 192.168.0.6:5060 -> 192.168.0.50:5060 SIP/2.0 100 trying -- your call is important to us..Via: SIP/2.0/UDP 192.16 8.0.50:5060;rport=5060;branch=z9hG4bK29BECBA8F97C4648A1E027E5DF93BEC0..From : Cameron local Domain <sip:6494466546@domain.co.nz>;tag=3738281931 ..To: <sip:021555222@domain.co.nz>..Call-ID: B1402DE5-6390-4715-A03F-9B 1F78AB60CF@192.168.0.50..CSeq: 28000 INVITE..Server: OpenSer (1.0.1 (i386/l inux))..Content-Length: 0..Warning: 392 192.168.0.6:5060 "Noisy feedback te lls: pid=8125 req_src_ip=192.168.0.50 req_src_port=5060 in_uri=sip:0214462 02(a)domain.co.nz out_uri=sip:021555222@domain.co.nz via_cnt==1".... # U 192.168.0.6:5060 -> 203.184.16.2:5060 INVITE sip:021555222@domain.co.nz SIP/2.0..Record-Route: <sip:60.234.13 7.50:5060;nat=yes;ftag=3738281931;lr=on>..Via: SIP/2.0/UDP 192.168.0.6;bran ch=z9hG4bKbdfc.69423e86.0..Via: SIP/2.0/UDP 192.168.0.50:5060;rport=5060;br anch=z9hG4bK29BECBA8F97C4648A1E027E5DF93BEC0..From: Cameron local domain <sip:6494466546@domain.co.nz>;tag=3738281931..To: <sip:021555222@domain.co.nz>..Contact: <sip:6494466546@192.168.0.50:5060>..Call-ID: B1402D E5-6390-4715-A03F-9B1F78AB60CF@192.168.0.50..CSeq: 28000 INVITE..Max-Forwar ds: 69..Content-Type: application/sdp..User-Agent: X-Lite release 1103m..Co ntent-Length: 301....v=0..o=6494466546 766866495 766868168 IN IP4 192.168.0 .50..s=X-Lite..c=IN IP4 192.168.0.50..t=0 0..m=audio 8000 RTP/AVP 0 8 3 98 97 101..a=rtpmap:0 pcmu/8000..a=rtpmap:8 pcma/8000..a=rtpmap:3 gsm/8000..a= rtpmap:98 iLBC/8000..a=rtpmap:97 speex/8000..a=rtpmap:101 telephone-event/8 000..a=fmtp:101 0-15.. #### U 192.168.0.6:5060 -> 192.168.0.50:5060 SIP/2.0 500 I'm terribly sorry, server error occurred (1/SL)..Via: SIP/2.0/ UDP 192.168.0.50:5060;rport=5060;branch=z9hG4bK29BECBA8F97C4648A1E027E5DF93 BEC0..From: Cameron local Domain <sip:6494466546@domain.co.nz>;tag= 3738281931..To: <sip:021555222@domain.co.nz>;tag=329cfeaa6ded039da25ff8 cbb8668bd2.bcdf..Call-ID: B1402DE5-6390-4715-A03F-9B1F78AB60CF(a)192.168.0.50 ..CSeq: 28000 INVITE..Server: OpenSer (1.0.1 (i386/linux))..Content-Length: 0..Warning: 392 192.168.0.6:5060 "Noisy feedback tells: pid=8125 req_src_ ip=192.168.0.50 req_src_port=5060 in_uri=sip:021555222@domain.co.nz out _uri=sip:021555222@domain.co.nz via_cnt==1".... # Any help would be appreciated Cameron