Telephone call security system

Details Telephone call security system Telephone call security system

1990-04-20

1991-06-04

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379200, H04M 1100

Patent

active

050220675

ABSTRACT:
A telephone call security system uses a long distance carrier access switch to prevent unauthorized access to the carrier by causing the switch control system to request a telephone identification serial number from the telephone and deny access if the serial number is not valid or if the number dialed is not an authorized number for the telephone whose serial number has been received. In addition, the system uses a coded query/response dialogue between the telephone and the switch control system for added security. The system may be implemented by modifying the carrier access switch control software and also includes a unique telephone and telephone resident control software.

REFERENCES:
patent: 4198545 (1980-04-01), Haist et al.
patent: 4698840 (1987-10-01), Dively et al.
patent: 4759056 (1988-07-01), Akiyama
patent: 4893325 (1990-01-01), Pankonen et al.
patent: 4947422 (1990-08-01), Smith et al.
Telephony Magazine, Nov. 14, 1988, "ANI is the Key to Unlock Advanced Network Services", pp. 64-68.
Sound & Communications, May 1984, Telecommunications, pp. 9-13.

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