Method and apparatus for verifying the identity of a user of different telecommunications services by means of biometrics

The invention relates to the controlled verifying the identity adopted a user or the calling and / or called party (8), which is connected via a communication terminal with a telecommunications network, on the basis of at least one biometric feature for connecting the subscriber to a communication system (7) at least supports an authentication service requiring communication of a number of authentication requiring communication services with different security requirements. In carrying out the subscriber authentication for the requested communication service for this purpose, an initializing associated to the identity identifier and stored biometric impression (20a, 20b, 20c) (for subscriber authentication in the number of authentication requiring communication services or a subsequently assigned to the identity code and stored, adapted biometric imprint 20a , 20b, 21c, 22c) are compared to the subscriber authentication at least for the requested communication service with at least one feature of a current feature structure of the subscriber, upon reaching a first limit value (11a, 11b, ..., 11e), the identification of the subscriber (8) the requested communication service verified, and on reaching a second Grenwertes (16, 11a, 11b, ..., 11e) an adapted biometric imprint is calculated (14b) and the identity identifier to ...