DT21-SIPhone Link with 3 contacts included power supply

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Phone Link with 3 contacts included power supply
These two modules provide the bus supply for the video intercom and for the link with the switchboard. They can be programmed as desired to call an interior line or to forward the call to a remote number when someone rings at the door. You can open and shut the door or gate with your phone. This is only required for the outdoor units with Siedle technology.