Systeme d'authentification analogique reciproque entre un termin

Details Systeme d'authentification analogique reciproque entre un termin Systeme d'authentification analogique reciproque entre un termin

1988-04-14

1989-07-25

Schreyer, Stafford D.

Telephonic communications

With check operated control

Fraud or interference prevention

379189, H04M 166

Patent

active

048521558

ABSTRACT:
The invention relates to a system for mutual authentication between a transmission line and a terminal, e.g. a prepayment telephone set.
The telephone (2) is connected to the line (14) via a monitoring device (18). Electronic circuits (18) and (12) are associated with the monitoring device and with the telephone in order to generate authentication frequency signals throughout the call at inaudible frequencies.

REFERENCES:
patent: 4625078 (1986-11-01), Crouch et al.

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