Devices for recording, processing, sending, transmitting, switching, storing and output of messages and data; communications computers; software; optical, electrotechnical and electronic communications equipment, in particular telephone exchange and transmission devices, telecommunication networks consisting of exchange and transmission equipment, individual modules and components of such equipment, such as power supply units, transmission media, such as tele-communication cables and optical fibres and pertinent connection elements; systems consisting of a combination of the appliances and devices mentioned above