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1. AU1995027847 - Circuit arrangement to prevent unauthorised operations on a wired telephone system

Office Australia
Application Number 27847/95
Application Date 21.06.1995
Publication Number 1995027847
Publication Date 22.02.1996
Publication Kind A
IPC
H04M 1/66
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
1Substation equipment, e.g. for use by subscribers
66with means for preventing unauthorised or fraudulent calling
H04M 3/38
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
38Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
CPC
H04M 1/66
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
1Substation equipment, e.g. for use by subscribers
66with means for preventing unauthorised or fraudulent calling
H04M 3/38
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
38Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
Applicants Viehmann, Matthias
Inventors Viehmann, Matthias
Priority Data 4421615 21.06.1994 DE
Title
(EN) Circuit arrangement to prevent unauthorised operations on a wired telephone system
Abstract
(EN)
The invention relates to a circuit arragement to prevent unauthorised operations, especially the unauthorised dialling of other subscribers, on a wired telephone system with leads using modular units. It is the purpose of the invention to provide a circuit arrangement which prevents unauthorised persons from tapping into the line between the exchange and the phone terminal, which is user-friendly, economical and independent of the operating system and can be both easily fitted to existing telephone systems and integrated into new ones. The circuit arrangement of the invention forms a control system of modular units A and B, in which unit A is fitted on the main distribution frame with the subscriber connection unit in the exchange and unit B is fitted between the TAE socket and the telephone so that only when the phone terminal is in authorised use are both modular units and an exchange of knowledge between them involved in the line loop existing between the phone terminal and the exchange during the conversation.