The SAR 1 allows for the connection of an external signaling device, such as a bell, horn, or lamp, that has its own power supply. The integrated switch enables the external signaling to be turned on or off as needed. The device is connected to a telecommunications connection line and is controlled by the ringing voltage. The connection can be made, for example, via the terminals Lb and W of the TAE connection socket or alternatively at the terminals La and Lb (parallel connection) of the connection line. The SAR 1 responds exclusively to the ringing voltage and not to dial impulses.