Method of remote interrogation of access authorisation for subscriber equipment.

摘要

A bidirectional link between a remote calling station and the subscriber terminal is established when a number is called and the remote control unit (STFAG) reads the serial number and other data from the memory (SPTE) of the called terminal. The same control unit employs a locally memorised algorithm to compute the access authorisation (password) from the serial number read from the terminal's memory, and to display it visually and/or by speech synthesiser and loudspeaker at either end of the link.