How do I access the admin menu of a Dahua or X-Security VTH intercom monitor?

How do I access the admin menu of a Dahua or X-Security VTH intercom monitor?

A Dahua or X-Security VTH intercom monitor does not have a web interface that can be accessed via a browser. The network settings, like the IP address, can be made using the VDPConfig Tool (Dahua Toolbox) or via the display of the monitor.

To open the admin menu, the "Settings" button on the monitor must be pressed for longer than 6 seconds. The admin menu opens after entering the set password.