Many people believe that the video phone – it's like a normal phone: box and in it a simple device. In fact, this is not true. Video phone – a collection of equipment assembled from parts from different manufacturers, because it it's so diverse that it is very rare to bring them to life using the equipment of one company. For example, for an organization that sets the video phone for the entry of visitors into a small office, is required equipment is simpler than for video door-rise, and even mnogopodezdnogo home. In this second case, the problem may vary from the simplest installation in every apartment to monitor changes to their number of the apartment, as well as installation of additional hidden cameras in the hallways, in front of the door to the apartment (in this case be able to record on these cameras and see if any).
Monitor in a video phone performs as a function of the negotiation and control unit, so the owner has the opportunity at the first signal to see a guest on the screen, chat with him and with the button to open the door. Relationship is most often carried out through the monthly phone, and in its absence – in speakerphone mode. Most monitors have a number of adjustments and settings for brightness, contrast and volume, and color models, video intercom and proposed regulation color saturation. But no matter how praised producers lcd color monitors, unfortunately, the quality still limps on both legs.