Method and apparatus for preventing recognition of a telephone d

Details Method and apparatus for preventing recognition of a telephone d Method and apparatus for preventing recognition of a telephone d

1989-01-06

1990-05-08

Cangialosi, Salvatore

Cryptography

Cryptanalysis

380 9, 380 39, 379200, H04K 102

Patent

active

049245120

ABSTRACT:
A method and apparatus for preventing recognition by a telephone system of a telephone dialing signal which inverts at least a portion of the telephone dialing signal in response to receiving the telephone dialing signal. Consequently, an inverted dialing signal is produced and is combined with the telephone dialing signal. Voice and data signals are unaffected. The telephone dialing signal is then connected to the telephone system and is unrecognizable as a valid number.

REFERENCES:
patent: 3624297 (1971-11-01), Chapman
patent: 3681536 (1972-08-01), Pask et al.
patent: 4000380 (1976-12-01), Jackson
patent: 4012602 (1977-03-01), Jackson
patent: 4092500 (1978-05-01), Hughes
patent: 4099033 (1978-07-01), Murray
patent: 4297534 (1981-10-01), Epstein et al.
patent: 4615575 (1986-10-01), Kossor
patent: 4683583 (1987-07-01), Kossor
patent: 4771455 (1988-09-01), Hareyama et al.
The Line-Locker.TM. Telephone Line Lock, Mictel, Inc.

Affiliated with

Also associated with

Rating

Method and apparatus for preventing recognition of a telephone d does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for preventing recognition of a telephone d, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for preventing recognition of a telephone d will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2355579