I've followed:
http://wiki.freeswitch.org/wiki/SIP_TLS
agent.pem => ./gentls_cert setup -cn pbx.freeswitch.org -alt DNS:pbx.freeswitch.org -org freeswitch.org.
cafile.pem => ./gentls_cert create_server -cn pbx.freeswitch.org -alt DNS:pbx.freeswitch.org -org freeswitch.org.
client.pem => ./gentls_cert create_client ...
also generated pkcs12 which was installed successfuly is both jitsi and csimplesip (but fail to register):
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt
This is the TLS part of vars.xml: