The universal telephone interfaces are designed above all to enable telephone switchboards not produced by Elvox to interface with Elvox audio and video door entry systems. The technologies involved in the connection are Sound System, Two Wire and Digibus. The interfaces are analogue and passive, so they must be connected to the telephone switchboard as extensions.
If for connection requirements the interface uses an urban line, the active interface article 3530 must also be connected to the universal interface.
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