Is an FQDN required for 3CX to function properly?

In the context of 3CX and its operation, using a Fully Qualified Domain Name (FQDN) is often discussed regarding how the system interacts with different elements such as client devices and external access. In split DNS mode, 3CX can function effectively without a typical requirement for an FQDN, as the DNS records are configured differently, allowing internal devices to resolve services directly without needing to reference an external domain name.

This means that in environments where split DNS is implemented, an internal DNS server can be set up to resolve the 3CX server's address for internal users. This configuration effectively allows internal communication to occur without the metadata overhead that an FQDN provides when accessing services externally.

While using an FQDN can help simplify configurations and improve manageability, its necessity is diminished under these specific conditions, making it possible to operate fully without it when the split DNS approach is correctly utilized.