Door Bell function has been implemented on Firmware V2.30.00 and later.
CP155B External Keypad With Smart Card Reader and Door Bell button:
The button will be disabled by default. The new output type (DOOR_BELL) can be bound to an area. On start-up the panel scans outputs looking for the Door Bell function. If found, the panel will enable the door bell key. When the Door Bell button is pressed the output will operate and all keypads in the area will play the door bell jingle.