Abstract: An alarm installation comprises a central alarm station and a number of alarm units. The alarm units can send messages to the central alarm station and the central alarm station can send messages such as voice messages or recorded spoken messages to a number of alert units. All sending and receiving operations are preferably performed on the public telephone network. The alarm units contain at least one operating device and/or detector for an emergency situiation and will at the activation of such a device or detector send a message thereof to the central alarm station. The latter receives the message and will send a corresponding message, e.g. in the shape of a spoken message, to the different alert places. These different alert places can then be interconnected by the central alrm station in order to interchange information in regard of suitable measures to be made.