Door Access and Intercom systems are part of our everyday life for entry to buildings or areas within a building. Some of these systems are as simple as a basic voice or voice/video based system with the ability to allow entry. While others are more complex with the ability for 1,000 names/numbers, scrolling directories instead of paper or touch screens.
Some systems are stand-alone with direct wiring from a ‘master station’ to remote stations. The majority are an auto-dialer, using its dedicated phone line to reach the desired party.