Telephone security system for cordless telephony

Details Telephone security system for cordless telephony Telephone security system for cordless telephony

1981-12-22

1984-03-13

Rubinson, G. Z.

179 18DA, 179 90D, H04M 166, H04Q 704

Patent

active

044369573

ABSTRACT:
A telephone security system particularly for use with cordless telephone, operates to prevent the base station of the system from being accessed by an unauthorized user.
Preselected digits are set by means of switches. In order to receive a dial tone, the correct digits as selected by the switches must be dialed. The security system operates to compare the dialed digits with those digits set by the switches. If a favorable comparison is had, the security device then connects the telephone line to the base station and allows dial tone to be transmitted to thereby enable a call to be implemented by the user.

REFERENCES:
patent: 3568787 (1971-06-01), Vogelman et al.
patent: 3873781 (1975-03-01), Nissim
patent: 3931476 (1976-01-01), Matthews
patent: 4053717 (1977-10-01), Snider
patent: 4099033 (1978-07-01), Murray
patent: 4234764 (1980-11-01), Beebe
patent: 4332981 (1982-06-01), Palombi et al.

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