[SR-Users] SIP Attack

Hello. I was wondering if someone could help me here. From time to time I stat to receive from the internet this SIP message : U 190.22.140.170:51316 -> 64.76.154.110:5060 SIP/2.0 400 BadRequest. Via: . From: . To: . Call-ID: . CSeq: . User-Agent: AddPac SIP Gateway. Content-Length: 0. . At burst rate of 124 pps (packets per second), this meesage is entering to Kamailio routine and generating a lot of ERROR logs lie these : Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: ERROR: <core> [msg_translator.c:1943]: ERROR: build_res_buf_from_sip_req: al as, parse_headers failed Apr 1 03:32:19 kmborde /usr/local/sbin/kamailio[2311]: WARNING: sanity [sanity.c:254]: sanity_check(): check_required_headers(): fa iled to send 400 via sl reply Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: ERROR: <core> [msg_translator.c:1943]: ERROR: build_res_buf_from_sip_req: al as, parse_headers failed Apr 1 03:32:20 kmborde /usr/local/sbin/kamailio[2301]: WARNING: sanity [sanity.c:254]: sanity_check(): check_required_headers(): fa iled to send 400 via sl reply Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: ERROR: <core> [parser/msg_parser.c:179]: ERROR: get_hdr_field: bad to header Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: INFO: <core> [parser/msg_parser.c:353]: ERROR: bad header field [To: <sip:Re gister=>5] Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: ERROR: <core> [msg_translator.c:1943]: ERROR: build_res_buf_from_sip_req: al as, parse_headers failed Apr 1 03:32:23 kmborde /usr/local/sbin/kamailio[2320]: WARNING: sanity [sanity.c:254]: sanity_check(): check_required_headers(): fa iled to send 400 via sl reply The only way that I have now for blocking this packet to hit the Kamailio server is via iptables : iptables -A INPUT -s 190.22.140.170 -p udp --dport 5060 --jump REJECT Is there a better way to do this?! Thanks in advance, * * *Ricardo Martinez.-*