System for providing secure telecommunication access to a comput

Details System for providing secure telecommunication access to a comput System for providing secure telecommunication access to a comput

1989-03-08

1990-05-01

Brown, Thomas W.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 94, 379189, 379211, H04M 166, H04M 1100

Patent

active

049225219

ABSTRACT:
A telecommunication exchange which provides secure access by only authorized terminals to a computer connected to the exchange. The control processor in the central control unit of the exchange is programmed to provide a "call-back" procedure in respone to a request from a terminal for access to the computer. The calling terminal enters by tone or pulse dialing, the address (such as a telephone number) of the computer together with an identification code. The control processor compares such identification code with a list stored therein of authorized identification codes and authorized terminals addresses corresponding thereto. If the identification code is authorized, the control processor causes a confirm signal to be transmitted from the exchange to the requesting terminal signifying to the user of such terminal to release its line, after which a ringing signal is transmitted to the authorized terminal address corresponding to the authorized code. When such authorized terminal then engages its line, the control processor causes the switching network to establish connection of such terminal to the computer. Since the security procedure is provided by the control processor, there is no need for an external security unit and secure access to the computer can be maintained even if call-forwarding facilities are provided by the exchange.

REFERENCES:
patent: 4154988 (1979-05-01), Fechalos et al.
patent: 4531023 (1985-07-01), Levine
patent: 4785408 (1988-11-01), Britton et al.
patent: 4815031 (1989-03-01), Furukawa
"Securing Dial-Up Networks", J. Holmes, Telecommunications, Mar. 1984, pp. 84 and 124.
"The AT&T Multi-Mode Voice Systems . . . ", S. D. Hester et al., Proc. of the 1985 AVIOS Conf., Sep. 1985, 12 pages.
"New Customer-Defined Network Service", M. Berger et al., Telephony, Mar. 10, 1986, pp. 50, 52, 54, 58 and 60.

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