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### Description

After upgrading from Kamailio 5.7 to 5.8, we encountered an issue where SIP messages fail to send over WSS, resulting in a 477 error.

The problem seems to be related to the addition of protocol validation logic in tcp_main.c: https://github.com/kamailio/kamailio/blob/master/src/core/tcp_main.c#L1747 https://github.com/kamailio/kamailio/commit/4a40b16d4f9bef9bc75d3272c83878e6...

``` a->parent->rcv.proto == proto ``` `a->parent->rcv.proto` is `6 (indicating WSS)`, while `proto` is `5 (indicating WS)`, causing the connection lookup to fail.

Removing this validation line resolves the issue, restoring the previous behavior where SIP messages are successfully sent over WSS.

#### INFO level Log Messages

``` Jan 17 00:07:08.948495 kamailio[3487903]: WARNING: [799a4e2e-5fdf-444a-8dab-b2ab554c4933] tm [../../core/forward.h:204]: msg_send_buffer(): TCP/TLS connection for WebSocket could not be found Jan 17 00:07:08.948516 kamailio[3487903]: WARNING: [799a4e2e-5fdf-444a-8dab-b2ab554c4933] tm [t_fwd.c:1586]: t_send_branch(): sending request on branch 0 failed Jan 17 00:07:08.948536 kamailio[3487903]: INFO: [799a4e2e-5fdf-444a-8dab-b2ab554c4933] sl [sl_funcs.c:420]: sl_reply_error(): message marked with delayed-reply flag ```

#### DEBUG Level Log Messages

``` Jan 17 00:15:03.377043 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.377102 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Allow-Events] type 39 Jan 17 00:15:03.377122 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:661]: parse_headers(): header field type 39, name=<Allow-Events>, body=<talk, hold, conference, refer> Jan 17 00:15:03.377178 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Subscription-State] type 37 Jan 17 00:15:03.377196 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:661]: parse_headers(): header field type 37, name=<Subscription-State>, body=<terminated;reason=noresource> Jan 17 00:15:03.377254 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Route] type 9 Jan 17 00:15:03.377274 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:661]: parse_headers(): header field type 9, name=<Route>, body=<sip:1.1.1.1:9060;lr;received=sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797%3Btransport%3Dws> Jan 17 00:15:03.377331 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Supported] type 17 Jan 17 00:15:03.377349 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:661]: parse_headers(): header field type 17, name=<Supported>, body=<path, replaces> Jan 17 00:15:03.377406 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Contact] type 7 Jan 17 00:15:03.377426 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:661]: parse_headers(): header field type 7, name=<Contact>, body=sip:dialpadgw@example.com Jan 17 00:15:03.377483 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Content-Type] type 11 Jan 17 00:15:03.377501 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:661]: parse_headers(): header field type 11, name=<Content-Type>, body=<application/data> Jan 17 00:15:03.377555 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Event] type 22 Jan 17 00:15:03.377575 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:661]: parse_headers(): header field type 22, name=<Event>, body=<message-summary> Jan 17 00:15:03.377641 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:91]: get_hdr_field(): found end of header Jan 17 00:15:03.377698 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/pvapi.c:1450]: pv_printf_mode(): final buffer length 115 Jan 17 00:15:03.377716 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] 373:route[0]: sip:1.1.1.1:9060;lr;received=sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797%3Btransport%3Dws Jan 17 00:15:03.377736 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.377754 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] pv [pv_core.c:1971]: pv_get_hdr_helper(): index out of range Jan 17 00:15:03.377773 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/pvapi.c:1450]: pv_printf_mode(): final buffer length 17 Jan 17 00:15:03.377793 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] 374:route[1]: <null> Jan 17 00:15:03.377812 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.377832 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.377849 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Supported] type 17 Jan 17 00:15:03.377867 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [X-carrier] type 0 Jan 17 00:15:03.377887 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.377905 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Max-Forwards] type 8 Jan 17 00:15:03.377924 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [X-FS-Support] type 0 Jan 17 00:15:03.377943 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Allow-Events] type 39 Jan 17 00:15:03.377962 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [X-FS-Support] type 0 Jan 17 00:15:03.377982 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [Content-Type] type 11 Jan 17 00:15:03.378001 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_hname2.c:314]: parse_sip_header_name(): parsed header name [X-FS-Support] type 0 Jan 17 00:15:03.378020 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378038 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378056 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378076 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378096 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378115 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378174 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378194 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378327 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=200 Jan 17 00:15:03.378383 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/pvapi.c:1450]: pv_printf_mode(): final buffer length 117 Jan 17 00:15:03.378403 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] 387:Route-URI is: sip:1.1.1.1:9060;lr;received=sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797%3Btransport%3Dws Jan 17 00:15:03.378422 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] pv [pv_core.c:1343]: pv_get_dsturi(): no destination URI Jan 17 00:15:03.378442 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:1565]: t_check_msg(): msg (0x7f845f8bc2c0) id=3/3519371 global id=2/3519371 T start=0xffffffffffffffff Jan 17 00:15:03.378461 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.378479 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=78 Jan 17 00:15:03.378499 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:781]: t_lookup_request(): start searching: hash=32072, isACK=0 Jan 17 00:15:03.378517 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:499]: matching_3261(): RFC3261 transaction matching failed - via branch [z9hG4bK84d7.eabb4795000000000000000000000000.0] Jan 17 00:15:03.378537 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:981]: t_lookup_request(): no transaction found Jan 17 00:15:03.378555 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:1637]: t_check_msg(): msg (0x7f845f8bc2c0) id=3/3519371 global id=3/3519371 T end=(nil) Jan 17 00:15:03.378572 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1326]: parse_uri(): state=5 Jan 17 00:15:03.378589 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1327]: parse_uri(): parsed uri:#012 type=1 user=<+11234567890-1234>(52)#012 passwd=<>(0)#012 host=<example.com>(22)#012 port=<>(0): 0#012 params=<>(0)#012 headers=<>(0) Jan 17 00:15:03.378607 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1336]: parse_uri(): uri flags : Jan 17 00:15:03.378634 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1341]: parse_uri(): value=0 Jan 17 00:15:03.378655 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1342]: parse_uri(): uri params:#012 transport=<>, val=<>, proto=0 Jan 17 00:15:03.378672 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1345]: parse_uri(): user-param=<>, val=<> Jan 17 00:15:03.378691 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1348]: parse_uri(): method=<>, val=<> Jan 17 00:15:03.378711 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1350]: parse_uri(): ttl=<>, val=<> Jan 17 00:15:03.378730 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1352]: parse_uri(): maddr=<>, val=<> Jan 17 00:15:03.379547 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1354]: parse_uri(): lr=<> Jan 17 00:15:03.379584 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1355]: parse_uri(): r2=<> Jan 17 00:15:03.379759 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] siputils [checks.c:122]: has_totag(): no totag Jan 17 00:15:03.379779 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=200 Jan 17 00:15:03.379799 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] rr [loose.c:80]: is_preloaded(): is_preloaded: Yes Jan 17 00:15:03.379817 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1326]: parse_uri(): state=10 Jan 17 00:15:03.379835 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1327]: parse_uri(): parsed uri:#012 type=1 user=<>(0)#012 passwd=<>(0)#012 host=<1.1.1.1>(13)#012 port=<9060>(4): 9060#012 params=<lr;received=sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797%3Btransport%3Dws>(79)#012 headers=<>(0) Jan 17 00:15:03.379856 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1336]: parse_uri(): uri flags : Jan 17 00:15:03.379874 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1341]: parse_uri(): value=0 Jan 17 00:15:03.379892 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1342]: parse_uri(): uri params:#012 transport=<>, val=<>, proto=0 Jan 17 00:15:03.379913 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1345]: parse_uri(): user-param=<>, val=<> Jan 17 00:15:03.379931 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1348]: parse_uri(): method=<>, val=<> Jan 17 00:15:03.379950 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1350]: parse_uri(): ttl=<>, val=<> Jan 17 00:15:03.379969 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1352]: parse_uri(): maddr=<>, val=<> Jan 17 00:15:03.379987 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1354]: parse_uri(): lr=<lr> Jan 17 00:15:03.380007 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1355]: parse_uri(): r2=<> Jan 17 00:15:03.380025 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/socket_info.c:737]: grep_sock_info(): checking if host==us: 13==11 && [1.1.1.1] == [10.128.0.35] Jan 17 00:15:03.380044 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/socket_info.c:741]: grep_sock_info(): checking if port 9060 (advertise 9060) matches port 9060 Jan 17 00:15:03.380064 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/socket_info.c:763]: grep_sock_info(): checking advertise if host==us: 13==13 && [1.1.1.1] == [1.1.1.1] Jan 17 00:15:03.380081 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/forward.c:446]: check_self(): host (0:1.1.1.1:9060) == me Jan 17 00:15:03.380173 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] rr [loose.c:886]: after_loose(): Topmost route URI: 'sip:1.1.1.1:9060;lr;received=sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797%3Btransport%3Dws' is me Jan 17 00:15:03.380238 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=200 Jan 17 00:15:03.380295 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:91]: get_hdr_field(): found end of header Jan 17 00:15:03.380351 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] rr [loose.c:181]: find_next_route(): No next Route HF found Jan 17 00:15:03.380379 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] rr [loose.c:916]: after_loose(): No next URI found Jan 17 00:15:03.380398 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] rr [rr_cb.c:94]: run_rr_callbacks(): callback id 1 entered with <lr;received=sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797%3Btransport%3Dws> Jan 17 00:15:03.380415 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] uac [replace.c:567]: restore_uri(): getting 'vsf' Route param Jan 17 00:15:03.380435 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] uac [replace.c:570]: restore_uri(): route param 'vsf' not found Jan 17 00:15:03.380453 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] uac [replace.c:567]: restore_uri(): getting 'vst' Route param Jan 17 00:15:03.380473 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] uac [replace.c:570]: restore_uri(): route param 'vst' not found Jan 17 00:15:03.380491 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] rr [rr_cb.c:94]: run_rr_callbacks(): callback id 0 entered with <lr;received=sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797%3Btransport%3Dws> Jan 17 00:15:03.380584 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/strutils.c:207]: unescape_user(): unescaped string is sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797;transport=ws Jan 17 00:15:03.380602 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] path [path.c:504]: path_rr_callback(): setting dst uri: sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797;transport=ws Jan 17 00:15:03.380768 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/pvapi.c:1450]: pv_printf_mode(): final buffer length 83 Jan 17 00:15:03.380786 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] 497:outbound proxy is: sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797;transport=ws Jan 17 00:15:03.381032 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/pvapi.c:1450]: pv_printf_mode(): final buffer length 66 Jan 17 00:15:03.381049 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] 514:found target_ip from du: [2604:3d08:777a:61a0:601f:864:1234:1234] Jan 17 00:15:03.383827 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/action.c:1477]: do_action(): setting send-socket to [tls:[2600:1900:4000:f7cd:0:f::]:443] Jan 17 00:15:03.383849 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.383911 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.383931 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.383949 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.384006 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.384065 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/pvapi.c:1450]: pv_printf_mode(): final buffer length 22 Jan 17 00:15:03.384181 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1326]: parse_uri(): state=5 Jan 17 00:15:03.384206 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1327]: parse_uri(): parsed uri:#012 type=1 user=<dialpadgw>(9)#012 passwd=<>(0)#012 host=<example.com>(22)#012 port=<>(0): 0#012 params=<>(0)#012 headers=<>(0) Jan 17 00:15:03.384225 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1336]: parse_uri(): uri flags : Jan 17 00:15:03.384244 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1341]: parse_uri(): value=0 Jan 17 00:15:03.384265 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1342]: parse_uri(): uri params:#012 transport=<>, val=<>, proto=0 Jan 17 00:15:03.384286 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1345]: parse_uri(): user-param=<>, val=<> Jan 17 00:15:03.384304 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1348]: parse_uri(): method=<>, val=<> Jan 17 00:15:03.384324 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1350]: parse_uri(): ttl=<>, val=<> Jan 17 00:15:03.384344 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1352]: parse_uri(): maddr=<>, val=<> Jan 17 00:15:03.384362 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1354]: parse_uri(): lr=<> Jan 17 00:15:03.384401 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1355]: parse_uri(): r2=<> Jan 17 00:15:03.384578 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1714]: _tcpconn_find(): 0 port 0 Jan 17 00:15:03.384595 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/pvapi.c:1450]: pv_printf_mode(): final buffer length 95 Jan 17 00:15:03.384612 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] 1168:<==== Relaying to sip:[2604:3d08:777a:61a0:601f:864:1234:1234]:52797;transport=ws conid=<null> Jan 17 00:15:03.384630 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:1868]: t_newtran(): msg (0x7f845f8bc2c0) id=3/3519371 global id=3/3519371 T start=(nil) Jan 17 00:15:03.384648 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.384666 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=78 Jan 17 00:15:03.384682 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:781]: t_lookup_request(): start searching: hash=32072, isACK=0 Jan 17 00:15:03.384701 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:499]: matching_3261(): RFC3261 transaction matching failed - via branch [z9hG4bK84d7.eabb4795000000000000000000000000.0] Jan 17 00:15:03.384717 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:981]: t_lookup_request(): no transaction found Jan 17 00:15:03.384733 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1326]: parse_uri(): state=65 Jan 17 00:15:03.384751 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1327]: parse_uri(): parsed uri:#012 type=1 user=<36k22ler>(8)#012 passwd=<>(0)#012 host=<f6sbiii372li.invalid>(20)#012 port=<>(0): 0#012 params=<transport=ws>(12)#012 headers=<>(0) Jan 17 00:15:03.384768 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1336]: parse_uri(): uri flags : Jan 17 00:15:03.384793 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1341]: parse_uri(): value=0 Jan 17 00:15:03.384812 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1342]: parse_uri(): uri params:#012 transport=<transport=ws>, val=<ws>, proto=5 Jan 17 00:15:03.384828 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1345]: parse_uri(): user-param=<>, val=<> Jan 17 00:15:03.384848 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1348]: parse_uri(): method=<>, val=<> Jan 17 00:15:03.384868 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1350]: parse_uri(): ttl=<>, val=<> Jan 17 00:15:03.384886 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1352]: parse_uri(): maddr=<>, val=<> Jan 17 00:15:03.384907 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1354]: parse_uri(): lr=<> Jan 17 00:15:03.384925 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1355]: parse_uri(): r2=<> Jan 17 00:15:03.385025 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=78 Jan 17 00:15:03.385045 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/crypto/md5utils.c:67]: MD5StringArray(): MD5 calculated: 6e9568ded8dde3ef89a05a4f03829dc5 Jan 17 00:15:03.385065 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [h_table.c:415]: build_cell(): created new cell 0x7f8424c15380 Jan 17 00:15:03.385084 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [h_table.h:549]: insert_into_hash_table_unsafe(): cell label: 1965846678 Jan 17 00:15:03.385457 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1326]: parse_uri(): state=65 Jan 17 00:15:03.385476 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1327]: parse_uri(): parsed uri:#012 type=1 user=<>(0)#012 passwd=<>(0)#012 host=<[2604:3d08:777a:61a0:601f:864:1234:1234]>(40)#012 port=<52797>(5): 52797#012 params=<transport=ws>(12)#012 headers=<>(0) Jan 17 00:15:03.385496 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1336]: parse_uri(): uri flags : Jan 17 00:15:03.385515 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1341]: parse_uri(): value=0 Jan 17 00:15:03.385534 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1342]: parse_uri(): uri params:#012 transport=<transport=ws>, val=<ws>, proto=5 Jan 17 00:15:03.385553 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1345]: parse_uri(): user-param=<>, val=<> Jan 17 00:15:03.385571 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1348]: parse_uri(): method=<>, val=<> Jan 17 00:15:03.385591 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1350]: parse_uri(): ttl=<>, val=<> Jan 17 00:15:03.385608 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1352]: parse_uri(): maddr=<>, val=<> Jan 17 00:15:03.385628 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1354]: parse_uri(): lr=<> Jan 17 00:15:03.385649 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/parse_uri.c:1355]: parse_uri(): r2=<> Jan 17 00:15:03.385668 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/msg_translator.c:1845]: check_boundaries(): no multi-part body Jan 17 00:15:03.385772 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1714]: _tcpconn_find(): 0 port 52797 Jan 17 00:15:03.385792 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/ip_addr.c:580]: print_ip(): tcpconn_find: ip 2604:3d08:777a:61a0:601f:864:1234:1234 Jan 17 00:15:03.385812 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1735]: _tcpconn_find(): a=0x7f8424c013a0, c=0x7f8424c01150, c->id=1, alias port= 52797 port=52797 Jan 17 00:15:03.385830 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/ip_addr.c:580]: print_ip(): ip=2604:3d08:777a:61a0:601f:864:1234:1234 Jan 17 00:15:03.385850 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1746]: _tcpconn_find(): found connection by peer address (id: 1) Jan 17 00:15:03.385869 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/msg_translator.c:162]: check_via_address(): (1.1.1.1, 1.1.1.1, 0) Jan 17 00:15:03.386610 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1714]: _tcpconn_find(): 0 port 52797 Jan 17 00:15:03.386628 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/ip_addr.c:580]: print_ip(): tcpconn_find: ip 2604:3d08:777a:61a0:601f:864:1234:1234 Jan 17 00:15:03.386648 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1735]: _tcpconn_find(): a=0x7f8424c013a0, c=0x7f8424c01150, c->id=1, alias port= 52797 port=52797 Jan 17 00:15:03.386666 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/ip_addr.c:580]: print_ip(): ip=2604:3d08:777a:61a0:601f:864:1234:1234 Jan 17 00:15:03.386685 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1714]: _tcpconn_find(): 0 port 52797 Jan 17 00:15:03.386707 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/ip_addr.c:580]: print_ip(): tcpconn_find: ip 2604:3d08:777a:61a0:601f:864:1234:1234 Jan 17 00:15:03.386726 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/tcp_main.c:1735]: _tcpconn_find(): a=0x7f8424c01380, c=0x7f8424c01150, c->id=1, alias port= 52797 port=52797 Jan 17 00:15:03.386747 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/ip_addr.c:580]: print_ip(): ip=2604:3d08:777a:61a0:601f:864:1234:1234 Jan 17 00:15:03.386766 kamailio[3519371]: WARNING: [61e5f40c-acba-471f-94be-e66334eb217d] tm [../../core/forward.h:204]: msg_send_buffer(): TCP/TLS connection for WebSocket could not be found Jan 17 00:15:03.386786 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_fwd.c:1566]: t_send_branch(): send to 2604:3d08:777a:61a0:601f:864:1234:1234:52797 (5) failed Jan 17 00:15:03.386805 kamailio[3519371]: WARNING: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_fwd.c:1586]: t_send_branch(): sending request on branch 0 failed Jan 17 00:15:03.386825 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_funcs.c:358]: t_relay_to(): t_forward_nonack returned error -1 (-477) Jan 17 00:15:03.386842 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_funcs.c:376]: t_relay_to(): -477 error reply generation delayed Jan 17 00:15:03.386862 kamailio[3519371]: INFO: [61e5f40c-acba-471f-94be-e66334eb217d] sl [sl_funcs.c:420]: sl_reply_error(): message marked with delayed-reply flag Jan 17 00:15:03.386955 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/receive.c:531]: receive_msg(): request-route executed in: 3370 usec Jan 17 00:15:03.386972 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_lookup.c:2032]: t_unref(): delayed error reply generation(-477) Jan 17 00:15:03.386989 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/parser/msg_parser.c:324]: parse_headers(): flags=ffffffffffffffff Jan 17 00:15:03.387008 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/msg_translator.c:162]: check_via_address(): (1.1.1.1, 1.1.1.1, 0) Jan 17 00:15:03.387180 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_reply.c:1782]: cleanup_uac_timers(): RETR/FR timers reset Jan 17 00:15:03.387198 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] siptrace [siptrace.c:2476]: siptrace_net_data_sent(): processing message mode 1 Jan 17 00:15:03.387217 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] siptrace [siptrace_hep.c:523]: pipport2su(): the port string is 9060 Jan 17 00:15:03.387236 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] siptrace [siptrace_hep.c:523]: pipport2su(): the port string is 8060 Jan 17 00:15:03.387331 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/proxy.c:267]: mk_proxy(): doing DNS lookup... Jan 17 00:15:03.387512 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] siptrace [siptrace_hep.c:185]: trace_send_hep3_duplicate(): setting up the socket_info Jan 17 00:15:03.388083 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_reply.c:634]: _reply_light(): reply sent out - buf=0x7f845f88e060: SIP/2.0 477 Unfortun... shmem=0x7f8424c1b010: SIP/2.0 477 Unfortun Jan 17 00:15:03.388181 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_funcs.c:133]: put_on_wait(): put T [0x7f8424c15380] on wait Jan 17 00:15:03.388330 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] tm [t_reply.c:650]: _reply_light(): finished Jan 17 00:15:03.388390 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/usr_avp.c:654]: destroy_avp_list(): destroying list (nil) Jan 17 00:15:03.388437 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/usr_avp.c:654]: destroy_avp_list(): destroying list (nil) Jan 17 00:15:03.388483 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/usr_avp.c:654]: destroy_avp_list(): destroying list (nil) Jan 17 00:15:03.388531 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/usr_avp.c:654]: destroy_avp_list(): destroying list (nil) Jan 17 00:15:03.388578 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/usr_avp.c:654]: destroy_avp_list(): destroying list (nil) Jan 17 00:15:03.388625 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/usr_avp.c:654]: destroy_avp_list(): destroying list (nil) Jan 17 00:15:03.388675 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/xavp.c:630]: xavp_destroy_list(): destroying xavp list (nil) Jan 17 00:15:03.388722 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/xavp.c:630]: xavp_destroy_list(): destroying xavp list (nil) Jan 17 00:15:03.388782 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/xavp.c:630]: xavp_destroy_list(): destroying xavp list (nil) Jan 17 00:15:03.388801 kamailio[3519371]: DEBUG: [61e5f40c-acba-471f-94be-e66334eb217d] <core> [core/receive.c:635]: receive_msg(): cleaning up ```

#### SIP Traffic

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). --> ### Test Scenario: 1. A client connects to Kamailio over WSS on port 443 and sends a REGISTER request, successfully registering. 2. Another SIP server attempts to send a NOTIFY request to the client via Kamailio. - Kamailio fails to send the NOTIFY request to the client and responds with a 477 error. ``` Client Kamailio SIP Server | | | |--- REGISTER (WSS:443) -------> | | | | | |<--- 200 OK (Registration) ---- | | | | | | | <-- NOTIFY (UDP) -------------- | | | | | | | | | --- 477 Error -----------------> | | | (Failed to send NOTIFY) | | | | | | |

``` I replaced our Kamailio server domain in the SIP message with 'example.com'. kamailio IP: 1.1.1.1 client IP:3.3.3.3 ``` REGISTER sip:example.com SIP/2.0 Via: SIP/2.0/WSS hfotrcsa7jk0.invalid;branch=z9hG4bK769149 ... Contact: sip:23ao5h15@hfotrcsa7jk0.invalid;transport=ws;+sip.ice;reg-id=1;+sip.instance="urn:uuid:35e6e004-4a78-4c5f-999c-be70dda68e1f";expires=900 ... ``` ``` NOTIFY sip:23ao5h15@hfotrcsa7jk0.invalid;transport=ws SIP/2.0 Via: SIP/2.0/UDP 2.2.2.2:8060;branch=z9hG4bKa769.503729f6000000000000000000000000.0 To: sip:+11234567890-1234@example.com From: sip:mygw@example.com;tag=5e6acf4bd0c73e10f5120f096b1fc95c-e0aa3a8f User-Agent: kamailio (5.8.3 (x86_64/linux)) ... Route: sip:1.1.1.1:9060;lr;received=sip:3.3.3.3:63549%3Btransport%3Dws ... ```

``` SIP/2.0 477 Unfortunately error on sending to next hop occurred (477/TM) ```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a improvement. --> https://github.com/kamailio/kamailio/blob/master/src/core/tcp_main.c#L1747 ``` && (proto == PROTO_NONE || a->parent->rcv.proto == proto)) { ``` Removing this validation line resolves the issue, restoring the previous behavior where SIP messages are successfully sent over WSS.

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` # ./kamailio -v version: kamailio 5.8.3 (x86_64/linux) 42401c flags: , EXTRA_DEBUGUSE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 42401c compiled on 23:24:48 Jan 16 2025 with gcc 10.2.1 ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) --> debian 11.11

``` # uname -a Linux 5.10.0-33-cloud-amd64 #1 SMP Debian 5.10.226-1 (2024-10-03) x86_64 GNU/Linux ```