[SR-Users] bad cseq attack

i have noticed lots of these kind of attacks in my syslog: /var/log/syslog.1:Aug 21 04:23:46 host /usr/sbin/sip-proxy[13490]: ERROR: <core> [parser/parse_cseq.c:95]: parse_cseq(): ERROR: CSeq EoL expected /var/log/syslog.1:Aug 21 04:23:46 host /usr/sbin/sip-proxy[13490]: ERROR: <core> [parser/parse_cseq.c:98]: parse_cseq(): ERROR: parse_cseq: bad cseq /var/log/syslog.1:Aug 21 04:23:46 host /usr/sbin/sip-proxy[13490]: ERROR: <core> [parser/msg_parser.c:161]: get_hdr_field(): ERROR: get_hdr_field: bad cseq in order to be able to fail2ban the attacker, source ip address should appear in syslog message. is there a way to catch sip request syntax errors in config file so that appropriate syslog message could be generated? -- juha