I’ve upgraded an non-production FreePBX installation which was running Asterisk 15. I’ve used the upgrade script (after a full backup of the virtual machine) that was available for asterisk and it seems to work fine but it did not answer my question if there is a relation between an up-to-date FreePBX installation and an Asterisk version (eg 16, 18, 20).
Is there any limitation in this matter ?