METHOD AND DEVICE FOR TRANSMITTING CONFIDENTIAL CONNECTION SETUP AND SERVICE INFORMATION BETWEEN SUBSCRIBER-END TERMINALS AND ONE OR MORE DIGITAL SWITCHING OFFICES

摘要

A process and a device which are characterized in that at least one first security device is arranged at one subscriber, that at least one second security device is arranged in the exchange, or alternatively, an additional device with at least one second security device is connected upstream from each exchange, the first and the second security devices being able to encode and/or decode and exchange with each other connection establishment and/or service information of the subscriber.