Most changes in Enswitch 4.3 purely add functionality, but some change or remove functionality. Here is a list of such changes. If any of these adversely affect you, please contact support as soon as possible.

• init.d, and the Devuan and Suse Linux distributions, are no longer supported.
• Google Checkout is no longer supported.
• Queue event timestamps are exported as decimals to the nearest microsecond.
• The executable /opt/enswitch/bin/calld no longer offers an option to run as a daemon, then any crontab entry using it should be updated to remove its "-f" argument. Also, its systemd configuration file and init.d script have been removed, then any server using it should be updated to remove its /etc/systemd/system/enswitch_calld and /etc/init.d/enswitch_calld files.
• The default behavior of exec() or any other database-altering subroutine from lib/Database.pm is now to die() when there is an SQL error. To enable the behavior of versions 4.1 and 4.2 where the script would continue execution in case of an SQL error, the global configuration variable "Die on SQL errors" can be used.
• As usual, some JSON API functions have changed. If using the JSON API, these should be reviewed before upgrading.