Pepelux writes:
Try to put SBC-FQDN instead of SBC-IP-ADDR in the
Record-Route:
Record-Route: <sip:*SBC-FQDN*
:5060;ftag=c3da9477e05d45fca31c24a155af3318;lr=on>
Also, it better to follow OpenSIPS tips on the matter
https://blog.opensips.org/2019/09/16/opensips-as-ms-teams-sbc/
since it also mentions how to handle R-R in replies. Author of the
Kamailio one has not bothered to update his.
-- Juha