It is not even production actually ,it is in my office lab ,we are new to 3cx and didn't know that when we set our self up as partner we will get Enterprise for free for 14 years.So want to take advantage for the Enterprise version instead of Standard.But i want to use the same FQDN though.How many users? If you don't have many users or policies you can just spin another instance up and manually do it. If you have a lot of customization, just perform a full backup of your system including all the options. Copy the backups to another location to be safe. Uninstalled 3CX, reboot. Then download and install enterprise version and restore from backup. You will be asked for your new key during installation
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.