Data communications equipment security device using calling part

Details Data communications equipment security device using calling part Data communications equipment security device using calling part

1992-07-29

1994-04-05

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 25, 380 49, 380 50, 34082531, 34082534, 375 8, 379 93, 379 95, H04L 932, H04L 1222, G06F 1314, H04B 138

Patent

active

053012461

ABSTRACT:
A secure method of accessing a computer facility is provided within the data communications equipment (DCE), e.g., a modem or a terminal server, by the use of Calling Party Directory Number (CPDN). In particular, a telephone line from the local public switched telephone network is configured to provide CPDN information. This telephone line terminates in the DCE, which stores a plurality of lists, each list comprising a plurality of CPDN numbers. Upon receiving a telephone call from a calling party, the DCE takes one of three courses of action depending on the calling party's CPDN: 1) the DCE can answer the telephone call if the calling party's CPDN is on the "caller pays" list; 2) the DCE can refuse to answer the telephone call and then return the telephone call if the CPDN is on the "we pay" list; or 3) the DCE can simply not answer, or return, the telephone call if the calling party's CPDN is not found on any of the plurality of lists.

REFERENCES:
patent: 4520233 (1985-05-01), Smith
patent: 4876717 (1989-10-01), Barron et al.
patent: 4930150 (1990-05-01), Katz
patent: 4942598 (1990-07-01), Davis
patent: 5003595 (1991-03-01), Collins et al.
"Voiceband Data Transmission Interface Generic Requirements"; (Bellcore, Technical Advisory TA-NWT-000030, Issue 3; Apr., 1992).
"Class.SM. Feature: Calling Number Delivery"; (FSD01-02-1051; Bellcore, Tech. Ref. TR-TSY-00031, Issue 3; Jan., 1990).

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