Telecommunication system for bidirectional transmission of data and voice signals with a data network (2), which is connected via a satellite data transmission link (6, 5, 8) for bidirectional data signal transmission to at least one satellite device (7), which is connected to a 10 Base S switching device (14); a telephone network (25), which is connected via a number of subscriber telephone lines (23) for bidirectional voice signal transmission to the 10 Base S switching device (14); and with a number of 10 Base S subscriber modems (18), which are connected for bidirectional voice and data signal transmission to the 10 Base S switching device (14).