Transmission of messages via telephone

摘要

The PIN is checked and, when valid, a telephone line is made available for the user's telephone call. After checking the PIN an audio message allocated to the PIN, is transmitted to the user. The message may be allocated to a group of several PINs. The group may contain several PINs with identical preset number of end or starting digits. To each PIN is allocated a limited, prepaid credit amount for telephone calls, which is also checked during the PIN checking. An Independent claim specifies the transmission system.