Method for determining a nominal identification of a telecommunication subscriber

Zur Anzeige des Namens eines Kommunikationspartners an einem Kommunikationsendgerät wird ein vom Betreiber des den Kommunikationspartner ausweisenden Kommunikationssystems erstelltes elektronisch lesbares Rufnummernverzeichnis im Endgerät oder in dem zugehörigen Kommunikationssystem durchsucht. The method involves determining a name designation identifying a calling subscriber, for display on a terminal of a called subscriber in a communications network. The network has at least two communication systems comprising respectively a number of subscriber connections. A call number information, identifying the subscriber connection of the calling subscriber, is transmitted by the communication system of the calling subscriber to the communication system of the called subscriber, as part of a connection signalling. A call number index, prepared by the manager of the communication system of the calling subscriber and stored the existence of the transmitted call number. When the existence of the call number is detected, a name designation associated with it in the call number file is determined, and is displayed on the terminal of the called subscriber.