I suspect some of this may want to be listed under "3CX Ideas", other than that this is a list of bugbears I've encountered with my first deployment of the Debian version. My last implementation was a Windows v14 install. Plug and Play Provisioning only working when selecting FQDN and not IP address. Default interface for provisioning always defaults to IP address despite selecting Managed DNS during install. While setting up extensions, adding a phone's MAC address for provisioning prior to plugging in a phone didn't work. I had to wait for the Phone to appear in the Phones list then assign it to an extension. Despite the MAC already being listed there and nothing appearing to change. No 'select all' option in Extensions for bulk update. No option to bulk update extension 'Rights' when selecting multiple extensions. Some fields not present in CSV export/import for bulk updating. No password policy for SIP account or voicemaill password length. Only the Mobile field in 3CX Contacts is used for populating the Snom phonebook.xml Snom firmware location XML not automatically updating after changing the server's IP address. Changing the server's IP address causes the Secure SIP certificates to be removed and the option disabled. No validation on certificates entered for Secure SIP, plus the second field header is API key rather than Certificate Key. No way of changing the license without re-installing. That's all I can remember at the moment.