Intelligent telephone system and method for determining dialing

Details Intelligent telephone system and method for determining dialing Intelligent telephone system and method for determining dialing

1997-02-28

1999-08-31

Le, N.

Telephonic communications

Supervisory or control line signaling

Substation originated

379206, H04M 100

Patent

active

059463902

ABSTRACT:
A telephone system and method where telephones automatically learn the required prefix codes used in a private system to reach a public telephone exchange. The telephone has a memory that stores the numbers of callers who have called that telephone. A microprocessor then compares each number dialed on that telephone to the stored numbers saved by the telephone. The comparison is done from the last digit in each number to the first digit in each number. If at least the last seven digits of a dialed number match at least the last seven digits of a saved number, then a match is considered to occur. By analyzing the numbers in a dialed number that are not the same as the numbers in a matched saved number, the microprocessor can determine a possible prefix code that was contained within the dialed number. By performing a statistical analysis of possible prefix codes, the microprocessor can determine the proper prefix code for the telephone. Using similar analysis, the microprocessor can also automatically determine the area code in which the telephone is present the upper and lower limits of the private exchange to which the telephone belongs, and the digits between the local areacode and an extension on the private PBX.

REFERENCES:
patent: 5157719 (1992-10-01), Waldman
patent: 5455858 (1995-10-01), Lin
patent: 5475743 (1995-12-01), Nixon et al.
patent: 5528680 (1996-06-01), Karpicke

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