Telephone line access control

Details Telephone line access control Telephone line access control

1988-01-13

1990-08-28

Brown, Thomas W.

Telephonic communications

Call or terminal access alarm or control

At substation

379188, 379189, H04M 166

Patent

active

049532022

ABSTRACT:
A telephone line access control or call-barring unit operates on the monitor-and-clear principle to achieve selective call barring. The unit monitors dialled pulses being sent to an exchange, and recognizes a four-digit security number or authorization code intended to be known only to authorized users for bypassing the call-barring function. It also recognizes one or more two-digit or three-digit access codes for programming the call-barring unit to enter various different call-barring modes. The programmablity is purely in response to dialled numbers from any telephone connected to that particular line, and includes the option of changing the authorization code.

REFERENCES:
patent: 4099033 (1978-07-01), Murray
patent: 4332982 (1982-06-01), Thomas
patent: 4358640 (1982-11-01), Murray
patent: 4482787 (1984-11-01), Sagara et al.
patent: 4612419 (1986-09-01), Smith
patent: 4748657 (1988-05-01), Rudd et al.

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