If tls module is compiled against libssl 1.1, the options are:
* downgrade OS back to a version shipping libssl 1.0
* install somehow libssl 1.0 and compile kamailio against it
* upgrade kamailio to use at least latest kamailio 5.2.x
The libssl did major internal changes in libssl 1.1, older kamailio versions were released
earlier than libssl 1.1 became shipped by stable linux distros, so they do not support
libssl 1.1 properly. Kamailio 5.1 is out of maintenance, but you can try to backport from
5.2, however there were a lot of changes related to support of libssl 1.1 that I do not
think it worth doing it compared with just upgrading kamailio config for a newer version.
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