Security arrangement for cordless telephone system

Details Security arrangement for cordless telephone system Security arrangement for cordless telephone system

1985-03-29

1988-04-05

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

379188, H04M 166, H04B 126

Patent

active

047364041

ABSTRACT:
A security system for cordless telephones prevents unauthorized telephone lls over telephone lines. The system includes a base unit and a cordless handset unit which must share common information for proper operation. To prevent an unauthorized user in possession of a handset unit from easily matching a security code stored in the base unit and thereby obtain dial tone therefrom, the security code in the base unit is transferred to the handset unit while the handset unit is in a mating cradle in the base unit. Transfer circuits in the base unit and the handset unit respectively transmit and receive the security code and also an operating frequency channel over a direct-current charging path provided for charging of a battery in the handset unit whenever the handset unit is returned to the cradle.

REFERENCES:
patent: 4436957 (1984-03-01), Mazza et al.
patent: 4467140 (1984-08-01), Fathauer et al.
patent: 4471166 (1984-09-01), Cripps
patent: 4535200 (1985-08-01), Himmelbauer et al.
patent: 4560832 (1985-12-01), Bond et al.
patent: 4593155 (1986-06-01), Hawkins

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