Method and system for tapping telephone conversations

摘要

A method and a system for monitoring telephone calls are described. A useful signal (which represents the call information of a telephone call) and a data set (which contains at least one digital subscriber tag) are supplied to a recording center (20). The data set is supplied to a relaying device (28), in which it is compared with stored comparison data sets. If the subscriber tag matches a corresponding comparison tag of a selected comparison data set, a communications link is produced to a monitoring device (36).