[SR-Users] problems to parse Cseq 0 value

hello all we have seen that when an OPTIONS is sent with CSep: 0 OPTIONS, message is not parsed. Jun  4 10:12:09 proxy-1-aws /usr/local/kamailio/sbin/kamailio[2205]: ERROR: <core> [core/parser/parse_cseq.c:61]: parse_cseq(): no method found Jun  4 10:12:09 proxy-1-aws /usr/local/kamailio/sbin/kamailio[2205]: ERROR: <core> [core/parser/parse_cseq.c:92]: parse_cseq(): bad cseq Jun  4 10:12:09 proxy-1-aws /usr/local/kamailio/sbin/kamailio[2205]: ERROR: <core> [core/parser/msg_parser.c:144]: get_hdr_field(): bad cseq Jun  4 10:12:09 proxy-1-aws /usr/local/kamailio/sbin/kamailio[2205]: ERROR: <core> [core/parser/msg_parser.c:331]: parse_headers(): bad header field [CSeq: 0 Jun  4 10:12:09 proxy-1-aws /usr/local/kamailio/sbin/kamailio[2205]: WARNING: <core> [core/receive.c:198]: receive_msg(): parsing relevant headers failed as far i see in rfc3261 "The    sequence number value MUST be expressible as a 32-bit unsigned    integer and MUST be less than 2**31." i don't know if you already discussed about this, but do you think it would be something to fix? best regards and thanks a lot david escartin