For the last 24 hours we have had a strange problem with our 3CX on Debian installation. We use Fanvil X3 phones (version 2.10.1.6836, local on the same VLAN as 3CX server), Windows clients (version 16.3.0.198/16.6.2.89, which can be: local on different VLAN from 3CX, remote via VPN to office...