Telephone line automatic prefix dialer

Details Telephone line automatic prefix dialer Telephone line automatic prefix dialer

1997-03-05

1999-01-12

Tsang, Fan S.

Telephonic communications

Supervisory or control line signaling

379199, 379355, 379356, H04M 100

Patent

active

058598960

ABSTRACT:
Apparatus for eliminating the necessity for manually dialing a local area code as a prefix to a call within the same area code in telephone systems in which such action is a requirement. An automatic dialer is activated and immediately transmits the local area code onto the caller's telephone line when an off-hook condition is sensed; e.g., when a telephone handset is picked up. Thus, the caller can merely then dial an ordinary seven digit telephone number within the local area code. In order to provide for the selective dialing of long distance, when the caller "flashes" his line within a predetermined period (typically, a few seconds) after picking it up, a hang-up followed by a second off-hook is emulated; however, the automatic dialer is inhibited from again transmitting the area code. Consequently, the caller is presented with a dial tone, and a telephone number, including an area code which may be different from the local area code, may be successfully dialed.

REFERENCES:
patent: 5157719 (1992-10-01), Waldman
patent: 5309508 (1994-05-01), Rosen

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