Device to block unauthorized modem access over a PBX line

Details Device to block unauthorized modem access over a PBX line Device to block unauthorized modem access over a PBX line

1989-09-21

1991-05-21

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

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

H04M 1100

Patent

active

050181904

ABSTRACT:
A modem detector that enables detection of whether a modem is coupled to a phone line. When one is detected, various responses can occur, including: hanging up on the modem; checking if the modem linkage is allowable and, if it is not, then hanging up on the modem; and/or logging in the occurrence of an unauthorized modem access. To provide protection against unauthorized modem access, a digital embodiment can be used at the T1 phone line or an analog embodiment can be used after digital telephone data is converted into analog signals.

REFERENCES:
patent: 4626623 (1986-12-01), LaHaye
patent: 4707804 (1987-11-01), Leal
patent: 4815031 (1989-03-01), Furukawa
patent: 4815137 (1989-03-01), Benvenuto
patent: 4833706 (1989-05-01), Hughes-Hartogs
patent: 4852151 (1989-07-01), Dittakavi et al.

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