SSL has been required since V14 IIRC - some services won't work correctly if you don't have one. One example would be SMS.When we updated from 16 to 18, our reseller said we needed to buy an SSL for the FQDN to allow the upgrade to work correctly. Is the SSL is required to keep 3CX up and running?
Thank You
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.