Digital door-keeper exchanger.
Internal station-internal station and external station-internal station communication,
Auto-insertion on external door station,
Day/ night shunted switching,
Lost calls management, guarantee of system working even with problems with the door-keeper exchanger.
Insertion on a busy user,
Opening of many doors even on non-specific demand, memo/agenda,
Multiple door-keepers exchanger system allowed.
Updating or data import through memory card.
Call quevering and calls booking are available.