I have same issue over TCP trasport.
Also same config on 5.2 and on 5.1 branch is works
my debug logs
```
14(22) DEBUG: dispatcher [dispatch.c:2043]: ds_manage_routes(): set [1]
14(22) DEBUG: dispatcher [dispatch.c:2147]: ds_manage_routes(): using alg [4]
hash [0]
14(22) DEBUG: dispatcher [dispatch.c:2186]: ds_manage_routes(): selected
[4-1-0/0] <sip:pbx.rcsnet.ru:7000;transport=tcp>
14(22) DEBUG: dispatcher [dispatch.c:2207]: ds_manage_routes(): using first
entry [1/0]
14(22) DEBUG: dispatcher [dispatch.c:2005]: ds_select_dst_limit(): selected
target destinations: 1
14(22) exec: *** cfgtrace:request_route=[DISPATCH]
c=[/etc/kamailio/kamailio.cfg] l=334 a=25 n=xdbg
14(22) DEBUG: <script>: --- SCRIPT: going to <sip:rcsnet.ru> via
<sip:pbx.rcsnet.ru:7000;transport=tcp> (attrs: )
14(22) exec: *** cfgtrace:request_route=[DISPATCH]
c=[/etc/kamailio/kamailio.cfg] l=335 a=25 n=t_on_failure
14(22) exec: *** cfgtrace:request_route=[DISPATCH]
c=[/etc/kamailio/kamailio.cfg] l=336 a=5 n=route
14(22) exec: *** cfgtrace:request_route=[RELAY] c=[/etc/kamailio/kamailio.cfg]
l=252 a=16 n=if
14(22) exec: *** cfgtrace:request_route=[RELAY] c=[/etc/kamailio/kamailio.cfg]
l=249 a=24 n=t_relay
14(22) DEBUG: tm [t_lookup.c:1320]: t_newtran(): msg id=2 , global msg id=2 , T
on entrance=0
14(22) DEBUG: tm [t_lookup.c:477]: t_lookup_request(): start searching:
hash=58321, isACK=0
14(22) DEBUG: tm [t_lookup.c:436]: matching_3261(): RFC3261 transaction
matching failed
14(22) DEBUG: tm [t_lookup.c:660]: t_lookup_request(): no transaction found
14(22) DEBUG: tm [t_hooks.c:348]: run_reqin_callbacks_internal():
trans=0x7fc67c6698a8, callback type 1, id 0 entered
14(22) DEBUG: <core> [core/md5utils.c:67]: MD5StringArray(): MD5 calculated:
304be5a21ec5fd4786116faca8adf918
14(22) DEBUG: <core> [core/dns_cache.c:527]: _dns_hash_find():
(pbx.rcsnet.ru(13), 1), h=1005
14(22) DEBUG: <core> [core/tcp_main.c:1977]: tcp_send(): no open tcp connection
found, opening new one
14(22) DEBUG: <core> [core/ip_addr.c:229]: print_ip(): tcpconn_new: new tcp
connection: 217.12.247.98
14(22) DEBUG: <core> [core/tcp_main.c:1229]: tcpconn_new(): on port 7000, type 2
14(22) DEBUG: <core> [core/tcp_main.c:1535]: tcpconn_add(): hashes: 2231:0:0, 3
14(22) DEBUG: <core> [core/tcp_main.c:2871]: tcpconn_1st_send(): pending write
on new connection 0x7fc67c692180 (-1/811 bytes written) (err: 11 - Resource
temporarily unavailable)
14(22) ERROR: <core> [core/tcp_main.c:2890]: tcpconn_1st_send():
217.12.247.98:7000: EAGAIN and write queue full or failed for 0x7fc67c692180
14(22) DEBUG: <core> [core/tcp_main.c:3152]: tcpconn_chld_put(): destroying
connection 0x7fc67c692180 (3, -1) flags 0060
14(22) ERROR: tm [../../core/forward.h:251]: msg_send_buffer(): tcp_send failed
14(22) DEBUG: tm [t_fwd.c:1547]: t_send_branch(): send to 217.12.247.98:7000
(2) failed
14(22) WARNING: tm [t_fwd.c:1567]: t_send_branch(): sending request on branch 0
failed
14(22) DEBUG: tm [t_funcs.c:334]: t_relay_to(): t_forward_nonack returned error
-1 (-477)
14(22) DEBUG: tm [t_funcs.c:352]: t_relay_to(): -477 error reply generation
delayed
14(22) exec: *** cfgtrace:request_route=[RELAY] c=[/etc/kamailio/kamailio.cfg]
l=250 a=24 n=sl_reply_error
14(22) DEBUG: websocket [ws_conn.c:452]: wsconn_get(): wsconn_get for id [2]
14(22) DEBUG: websocket [ws_conn.c:458]: wsconn_get(): wsconn_get returns wsc
[0x7fc67c682058] refcnt [2]
14(22) DEBUG: websocket [ws_frame.c:738]: ws_frame_transmit(): Tx message:
SIP/2.0 477 Unfortunately error on sending to next hop occurred (477/SL)
Via: SIP/2.0/WSS
df7jal23ls0d.invalid;branch=z9hG4bK1T8IU9SPqhTVtPkfa8ZcmNATMyZhZoXS;rport=51976;received=192.168.100.31
From: "Sergey Safarov"<sip:[email protected]>;tag=4zUV2R25QizRCe3FWVXG
To: "Sergey
Safarov"<sip:[email protected]>;tag=52bcac7a84e52c398793b50c505689c5.7db8
Call-ID: 94ce71ed-0e53-d627-7cc2-39133bd30985
CSeq: 51999 REGISTER
Server: kamailio (5.3.0-dev2 (x86_64/linux))
Content-Length: 0
14(22) DEBUG: websocket [ws_frame.c:144]: encode_and_send_ws_frame(): encoding
WebSocket frame
14(22) DEBUG: websocket [ws_frame.c:170]: encode_and_send_ws_frame(): supported
non-control frame: 0x1
14(22) DEBUG: <core> [core/tcp_main.c:2455]: tcpconn_send_put(): send from
reader (22 (14)), reusing fd
14(22) DEBUG: <core> [core/tcp_main.c:2690]: tcpconn_do_send(): sending...
14(22) DEBUG: <core> [core/tcp_main.c:2724]: tcpconn_do_send(): after real
write: c= 0x7fc67c663c88 n=517 fd=7
14(22) DEBUG: <core> [core/tcp_main.c:2725]: tcpconn_do_send(): buf=
14(22) DEBUG: websocket [ws_conn.c:416]: wsconn_put_mode(): wsconn_put start
for [0x7fc67c682058] refcnt [2]
14(22) DEBUG: websocket [ws_conn.c:430]: wsconn_put_mode(): wsconn_put end for
[0x7fc67c682058] refcnt [1]
14(22) ERROR: sl [sl_funcs.c:372]: sl_reply_error(): stateless error reply
used: Unfortunately error on sending to next hop occurred (477/SL)
14(22) exec: *** cfgtrace:request_route=[RELAY] c=[/etc/kamailio/kamailio.cfg]
l=252 a=2 n=exit
14(22) DEBUG: <core> [core/receive.c:353]: receive_msg(): request-route
executed in: 957 usec
14(22) DEBUG: tm [t_lookup.c:1484]: t_unref(): delayed error reply
generation(-477)
14(22) DEBUG: tm [t_reply.c:1650]: cleanup_uac_timers(): RETR/FR timers reset
14(22) DEBUG: websocket [ws_conn.c:452]: wsconn_get(): wsconn_get for id [2]
14(22) DEBUG: websocket [ws_conn.c:458]: wsconn_get(): wsconn_get returns wsc
[0x7fc67c682058] refcnt [2]
14(22) DEBUG: websocket [ws_frame.c:738]: ws_frame_transmit(): Tx message:
SIP/2.0 477 Unfortunately error on sending to next hop occurred (477/TM)
Via: SIP/2.0/WSS
df7jal23ls0d.invalid;branch=z9hG4bK1T8IU9SPqhTVtPkfa8ZcmNATMyZhZoXS;rport=51976;received=192.168.100.31
From: "Sergey Safarov"<sip:[email protected]>;tag=4zUV2R25QizRCe3FWVXG
To: "Sergey
Safarov"<sip:[email protected]>;tag=1bb77df00a25769725961c2385ab007f-7db8
Call-ID: 94ce71ed-0e53-d627-7cc2-39133bd30985
CSeq: 51999 REGISTER
Server: kamailio (5.3.0-dev2 (x86_64/linux))
Content-Length: 0
14(22) DEBUG: websocket [ws_frame.c:144]: encode_and_send_ws_frame(): encoding
WebSocket frame
14(22) DEBUG: websocket [ws_frame.c:170]: encode_and_send_ws_frame(): supported
non-control frame: 0x1
14(22) DEBUG: <core> [core/tcp_main.c:2455]: tcpconn_send_put(): send from
reader (22 (14)), reusing fd
14(22) DEBUG: <core> [core/tcp_main.c:2690]: tcpconn_do_send(): sending...
14(22) DEBUG: <core> [core/tcp_main.c:2724]: tcpconn_do_send(): after real
write: c= 0x7fc67c663c88 n=517 fd=7
14(22) DEBUG: <core> [core/tcp_main.c:2725]: tcpconn_do_send(): buf=
14(22) DEBUG: websocket [ws_conn.c:416]: wsconn_put_mode(): wsconn_put start
for [0x7fc67c682058] refcnt [2]
14(22) DEBUG: websocket [ws_conn.c:430]: wsconn_put_mode(): wsconn_put end for
[0x7fc67c682058] refcnt [1]
14(22) DEBUG: tm [t_reply.c:596]: _reply_light(): reply sent out.
buf=0x7fc6806cb328: SIP/2.0 477 Unfortun..., shmem=0x7fc67c680348: SIP/2.0 477
Unfortun
14(22) DEBUG: tm [t_reply.c:607]: _reply_light(): finished
14(22) DEBUG: <core> [core/usr_avp.c:636]: destroy_avp_list(): destroying list 0
14(22) DEBUG: <core> [core/usr_avp.c:636]: destroy_avp_list(): destroying list 0
14(22) DEBUG: <core> [core/usr_avp.c:636]: destroy_avp_list(): destroying list 0
14(22) DEBUG: <core> [core/usr_avp.c:636]: destroy_avp_list(): destroying list 0
14(22) DEBUG: <core> [core/usr_avp.c:636]: destroy_avp_list(): destroying list 0
14(22) DEBUG: <core> [core/usr_avp.c:636]: destroy_avp_list(): destroying list 0
14(22) DEBUG: <core> [core/xavp.c:497]: xavp_destroy_list(): destroying xavp
list 0
14(22) DEBUG: <core> [core/receive.c:457]: receive_msg(): cleaning up
```
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