Cordless telephone

Details Cordless telephone Cordless telephone

1985-01-29

1987-01-27

Lev, Robert G.

Telephonic communications

Audio message storage, retrieval, or synthesis

455 88, H04Q 704

Patent

active

046395490

ABSTRACT:
A cordless telephone utilizes internally generated identifying codes to reduce crosstalk and the risk of wiretapping. When the handset unit is mounted on the base unit, a new identifying code is automatically generated and stored in the base unit, and then transmitted to the handset unit, which also stores it. When an incoming or outgoing telephone call is initiated, the two identifying codes stored in the base unit and the handset, respectively, are compared and, if they are not identical, the telephone call is cut off. Advantageously the identifying codes are randomly generated.

REFERENCES:
patent: 4535200 (1985-08-01), Himmelbauer et al.
patent: 4593155 (1986-06-01), Hawkins

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