System and method for updating database of customers' telephone

Details System and method for updating database of customers' telephone System and method for updating database of customers' telephone

1997-01-31

1999-07-06

Chang, Vivian

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379112, 379251, H04M 124, H04M 308, H04M 322

Patent

active

059206101

ABSTRACT:
A telephone number status is rapidly and easily examined to update a telephone number list. Telephone numbers stored in a telephone number list are sequentially transmitted from an ISDN line to a telephone line in a digital communication mode for making calls, and the status of each called telephone line is determined from connection information or from a line disconnect reason received from an associated station.

REFERENCES:
patent: 5455854 (1995-10-01), Dilts et al.
patent: 5796816 (1998-08-01), Utsumi

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