I have coturn successfully installed and running behind proxy/firewall. Nextcloud Talk and Group Session do work as intended tough not for employees who are connected via VPN from other locations. They use other internal IP C-Class Segments.
My question: How to enable coturn to listen and tun on these additional IP Ranges for instance:
192.168.100.0 DMZ (external address)
192.168.0.X - internal segment with clients (e.g. Frankfurt)
192.168.1.X - different internal location connected via VPN (e.g. Berlin)
192.168.2.X - another internal location connected via VPN (e.g. Cologne)