1results about "ISDN systems" patented technology

The object of the present invention is to meet the long-felt need for a fail-safe device consuming as little data capacity as possible, which is intended to effectively implement the authentication of the caller ID and the associated telephone number at the receiver. In view of the well-established methods in the field of ISDN technology, the solution is provided by means of a data channel in the form of a strictly assigned parallel authentication network consisting of a plurality of interfaces, which cannot provide any additional data payload in addition to the purpose of authentication. Limiting the data packets that can be received to always a few bytes and the responses that can be emitted to always a few bits enables a high degree of redundancy and allows implementation in the form of a system-related security component.