House communications system, especially for large residential/office buildings, has two house stations with associated identifiers for fulfilling associated communications tasks, door/third house station for house station user selection

摘要

The communications system has first (104a,104d) and second (104b,104e) house stations with associated identifiers for fulfilling first and second communications tasks and a door station or third house station for user selection of one of the house stations by sending a message with its identifier. The first house station compares the received identifier with the first identifier and if they are not identical sends a second message to the second house station with the received identifier for comparison with the second identifier.