We explore and test the 3CX V20. It has become a little more confusing and the translations/languages have not yet been implemented everywhere. The function codes are not complete (quick changeover of office hours) and why is it no longer possible to set up global business hours? I have not found anything about this.
I am also missing a separate business time for queues and ring groups.
The flexibility with V18 was therefore very high. The administrative overhead when everything has to be organized via groups is extremely high and complicated.
This worked perfectly with V18.
Example: General business hours globally, unless a department or a user has its own business hours.
1. own user/group business hours, if recorded
2. own department business hours, if recorded
3. global business hours.
It is not possible to make your own announcements for public holidays.
And as already mentioned by other partners, the incoming and outgoing parameters are missing in the SIP trunk.

Also the possibility to download single logs and not the whole package.
The activity log in the overview was also very helpful for initial analyses in V18 and is missing in V20.
We have also noticed that parameters (example: the developer parameter) are not yet working correctly.
This is just a small list after the first tests.
We hope and believe that V20 will continue to be as flexible and problem-free as V18.