IP audio/video electronic unit with wide-angle colour camera, automatic brightness adjustment, echo suppression, automatic sound balancing, automatic loudspeaker level control, automatic microphone level control, teleloop facility for hearing aids, 4 call buttons backlit with white LEDs with photocell lighting control, call status indicator LED, 1 output for electric lock control connected directly to S+ and S- terminals, 1 programmable input for connection of possible additional button for lock opening to CA+ and CA- terminals or for door status sensor, to be completed with audio/video front modules and single, double or fixed buttons or blank modules, PoE power supply
