It works for me with Kamailio master branch injecting the OPTIONS to the network using protoshoot from the same source tree:

./misc/tools/protoshoot/protoshoot -f /tmp/options.sip

The debug messages are:

 1(10089) DEBUG: <core> [core/udp_server.c:494]: udp_rcv_loop(): received on udp socket: (103/100/377) [[OPTIONS sip:example.com:5080;transport=tcp SIP/2.0 0A Via: SIP/2.0/TCP [2a00:1370:8131:ffdf:4398:8903:f]]
 1(10089) DEBUG: <core> [core/parser/parse_fline.c:250]: parse_first_line(): first line type 1 (request) flags 1
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:677]: parse_msg(): SIP Request:
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:679]: parse_msg():  method:  <OPTIONS>
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:681]: parse_msg():  uri:     <sip:example.com:5080;transport=tcp>
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:683]: parse_msg():  version: <SIP/2.0>
 1(10089) DEBUG: <core> [core/parser/parse_hname2.c:302]: parse_sip_header_name(): parsed header name [Via] type 1
 1(10089) DEBUG: <core> [core/parser/parse_via.c:1303]: parse_via_param(): Found param type 232, <branch> = <z9hG4bK0241.2e5db116000000000000000000000000.0>; state=15
 1(10089) DEBUG: <core> [core/parser/parse_via.c:2639]: parse_via(): end of header reached, state=5
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:555]: parse_headers(): Via found, flags=2
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:557]: parse_headers(): this is the first via
 1(10089) DEBUG: <core> [core/parser/parse_hname2.c:302]: parse_sip_header_name(): parsed header name [To] type 3
 1(10089) DEBUG: <core> [core/parser/parse_addr_spec.c:884]: parse_addr_spec(): end of header reached, state=10
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:173]: get_hdr_field(): <To> [37]; uri=[sip:example.com:5080;transport=tcp]
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:176]: get_hdr_field(): to body (37)[<sip:example.com:5080;transport=tcp>
], to tag (0)[]
 1(10089) DEBUG: <core> [core/parser/parse_hname2.c:302]: parse_sip_header_name(): parsed header name [From] type 4
 1(10089) DEBUG: <core> [core/parser/parse_hname2.c:302]: parse_sip_header_name(): parsed header name [CSeq] type 5
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:154]: get_hdr_field(): cseq <CSeq>: <10> <OPTIONS>
 1(10089) DEBUG: <core> [core/parser/parse_hname2.c:302]: parse_sip_header_name(): parsed header name [Call-ID] type 6
 1(10089) DEBUG: <core> [core/receive.c:392]: receive_msg(): --- received sip message - request - call-id: [0d2146aa2a479f0d-2232@192.168.1.6] - cseq: [10 OPTIONS]
 1(10089) DEBUG: <core> [core/parser/parse_hname2.c:302]: parse_sip_header_name(): parsed header name [Max-Forwards] type 8
 1(10089) DEBUG: <core> [core/parser/parse_hname2.c:302]: parse_sip_header_name(): parsed header name [Content-Length] type 12
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:187]: get_hdr_field(): content_length=0
 1(10089) DEBUG: <core> [core/parser/msg_parser.c:91]: get_hdr_field(): found end of header

Maybe it is something else in your config or another (custom) version.

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