[Serusers] forward_msg: no 2nd via found in reply

Hi everybody, I'm trying to use Asterisk as SUA and SER as SIP router. But Asterisk doesn't succeed to register the Asterisk user to SER... the standard error output tell me: "ERROR: forward_msg: no 2nd via found in reply" the SIP message looks like: to 193.175.133.19:5060 Retransmitting #5 (no NAT): REGISTER sip:potemkin.fokus.fraunhofer.de SIP/2.0 Via: SIP/2.0/UDP 193.175.133.19:5060;branch=z9hG4bK625558ec From: <sip:cys@potemkin.fokus.fraunhofer.de>;tag=as238e1f29 To: <sip:cys@potemkin.fokus.fraunhofer.de> Call-ID: 6b8b4567327b23c6643c986966334873(a)193.175.133.19 CSeq: 102 REGISTER User-Agent: Asterisk PBX Expires: 120 Contact: <sip:1234@193.175.133.19> Event: registration Content-Length: 0 and the configuration file is like: ###main routing logic route{ # initial sanity checks -- messages with # max_forwards==0, or excessively long requests if (!mf_process_maxfwd_header("10")) { sl_send_reply("483","Too Many Hops"); break; }; if ( msg:len > max_len ) { sl_send_reply("513", "Message too big"); break; }; record_route(); # Do strict routing if pre-loaded route headers present loose_route(); # message should be from 127.0.0.1 or # from other listening address if (src_ip==127.0.0.1) { if (method=="REGISTER") { save("location"); break; }; if (uri == myself) { # native SIP destinations are handled using our USRLOC DB if (!lookup("location")) { sl_send_reply("404", "Not Found"); break; }; }; # forward to current uri now if (!t_relay()) { sl_reply_error(); }; } else if (src_ip == myself) { # this is a request from local domain # but not from 127.0.0.1, must be from UA if (method=="REGISTER") { # register message, save it and forward to # security server save("location"); forward (127.0.0.1, 4050); break; }; forward (127.0.0.1, 4050); break; }; } I'm using ser 0.8.12, SuSE 9.1, Asterisk 0.9.1 I am quite new on SER, and I am trying to pursue the work of another person, so if something in it seems stupid, don't hesitate to tell me so... Cyprien