Device for cutting off an involontary connection at a telephone apparatus by the exchange in a system with two automatically alternatively connectable parties on a line.

摘要: Abstract of EP0216096The telephone stations (SP1, SP2) can be connected via a change- over switching device (W) to the line (a1, b1) by means which, when loop is closed in station, this station each case line. Each resettable disconnecting (K1, K2) change-over (W). When due fact that handset has not been replaced, set signal, which are disconnected from (W), supplied devices control signal coming exchange. By monitoring (16), reset transmitted associated with there no closure and reconnected The voltage on continuously monitored short-circuit (11-12) short circuit without exchange becoming active, defective