[SR-Users] dispatch REGISTER over TLS

[sthustfo]

I have a basic setup where kamailio receives SIP over websocket (no WSS)
and forwards to SIP server over TLS. I have enabled TLS in kamailio.cfg and
added dispatcher node as sips:SIP_SERVER:5061 and transport=tls.

+----+-------+------------------------+-------+----------+---------------+----------------+
| id | setid | destination            | flags | priority | attrs         |
description    |
+----+-------+------------------------+-------+----------+---------------+----------------+
|  4 |     1 | sips:10.0.0.100:5061 |     0 |        0 | transport=tls |
SIP SERVER |
+----+-------+------------------------+-------+----------+---------------+----------------+

Now when REGISTER is received over websocket, kamailio is responding with
error code 500 and phrase "500 I'm terribly sorry, server error occurred
(7/SL)". And on the console I see the following error messages.

12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} <core>
[core/md5utils.c:67]: MD5StringArray(): MD5 calculated:
f1ecf7bcb659b07fe81e332e100044e5
12(33858) ERROR: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm [ut.h:315]:
uri2dst2(): no corresponding socket found for "10.0.0.100" af 2 (tls:
10.0.0.100:5061)
12(33858) ERROR: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm [t_fwd.c:467]:
prepare_new_uac(): can't fwd to af 2, proto 3  (no corresponding listening
socket)
12(33858) ERROR: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
[t_fwd.c:1735]: t_forward_nonack(): failure to add branches
12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
[t_funcs.c:334]: t_relay_to(): t_forward_nonack returned error -7 (-7)
12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} tm
[t_funcs.c:352]: t_relay_to(): -7 error reply generation delayed
12(33858) exec: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} ***
cfgtrace:request_route=[RELAY] c=[/etc/kamailio/kamailio.cfg] l=587 a=24
n=sl_reply_error
12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} <core>
[core/msg_translator.c:162]: check_via_address(): (10.0.0.14,
hsvmphm3ps12.invalid, 0)
12(33858) DEBUG: {1 2521 REGISTER o9q7ujqgin33qgp00abijv} websocket
[ws_conn.c:452]: wsconn_get(): wsconn_get for id [3]

*tls.cfg contents*
[client:default]
method = TLSv1
verify_certificate = yes
require_certificate = yes
private_key = /home/test/kamailio/internal.key
certificate = /home/test/kamailio/internal.crt
ca_list = /home/test/kamailio/ca_list.pem

Any reason why this error is seen? Any inputs appreciated.

Thanks.
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