The device can be a personal computer at the workplace of a security guard or a janitor, a smartphone or a laptop belonging to the owner of the premises. There are also projects in which the signal is recorded on registrars installed in another city, so the information can be seen from another continent. But, of course, most often, as a calling panel in front of the door, customers use video intercoms (intercoms) of the same manufacturer.

It is possible to record video and audio on demand or when a motion sensor installed in the call panel is triggered. The device works in a network, so it is possible to connect other devices that support data in digital format. Opening doors, motion detection - all this is relevant for such equipment. This allows you to control who came to visit at the time of absence.You can learn more about intercoms at https://toolbuddy.co.uk/why-should-you-install-an-intercom-system-at-home/

It is possible to receive video and audio data even if there was no control device or call. The software installed in the terminal has the ability to force display and listen to everything that happens near the door, display and search for data, write information to a file, etc.