First dialed digit detector and comparator

Details First dialed digit detector and comparator First dialed digit detector and comparator

1987-12-30

1988-12-13

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379200, 379368, H04M 126

Patent

active

047916672

ABSTRACT:
A device for use in a telephone detects the first dialed digit and compares it with a reference value stored in a memory to determine the type of a telephone call.

REFERENCES:
patent: 4160879 (1979-07-01), Sullivan et al.
patent: 4232200 (1980-11-01), Hestad et al.
patent: 4246445 (1981-01-01), Hayasaka et al.
patent: 4482787 (1984-11-01), Sagara et al.
patent: 4726059 (1988-02-01), Havel

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