INDIREKT GESTEUERTE VERMITTLUNGSANLAGE, INSBESONDERE FERNSPRECHNEBENSTELLENANLAGE, MIT EINEM ZENTRALEN STEUERWERK UND MIT EINER DATENUEBERMITTLUNG VON TEILNEHMERSTELLEN UND ANDEREN ENDGERAETEN DURCH STECKEN VON IDENTITAETSMITTELN

Comparators to control the comparison of the identity codes with the stored subscriber-specific or terminal-specific codes are assigned to the central control unit (ZS1). If they agree, and depending on the absence or presence of an additional, subscriber-specific or terminal-specific stored note bit, they control the storage or deletion of this note bit. Depending on the presence of the note bit, for every interrogation for setting up or rerouting a connection, information corresponding to all authorisations, or to only a part, is transmitted to the central control unit (ZS1). In this way, a change of authorisations can be controlled from the terminal, by plugging in means of identification.