7
4 The Door Phone Man Machine Interface
(MMI)
The Door Phone front panel contains a built-in speaker, a microphone, Piezo or Touch-keypad and internal video
camera window (optional)
Figure 4-1 The Analog Door Phone Front Panel (Touch and Piezo Keypads editions)
The Analog Door Phone can be supplied in KEYPAD or SINGLE BUTTON editions.
The Analog Door phone Keypad edition equipped with the Touch or Piezo keypad 4x4: 16 buttons, where 12
buttons are standard telephone keypad: 0~9, * and # and additional row of 4 buttons are special functional buttons:
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