Is an internal DNS mandatory when selecting the option "I need a 3CX FQDN"?

When selecting the option "I need a 3CX FQDN," an internal DNS is not mandatory because the 3CX system can function without a dedicated internal DNS setup. The "FQDN" refers to a Fully Qualified Domain Name, which is used for the external access to the 3CX server. This means that as long as the system can resolve the FQDN externally—either through public DNS services or through other DNS configurations—an internal DNS setup is not strictly necessary.

In many deployments, external DNS servers handle requests for the FQDN without the need for a local DNS service. Therefore, the 3CX system can reliably operate and resolve its domain name with standard configurations for external connectivity. This flexibility allows for various network setups, including those without internal DNS infrastructure, making it convenient for different types of installations.