Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent
1997-03-31
1999-02-09
Loomis, Paul
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Monitoring
379 18, 379 13, 379220, 379229, 39520054, 370254, H04M 124, H04M 700, G06F 1516
Patent
active
058704523
ABSTRACT:
In the proposed Local Number Portability (LNP) telecommunications network, the traditional link between the first six digits of a ten-digit dialed number and the geographic link of a switch is broken. Some pre-LNP telephone services, however, have been implemented based on this geographic link. For the services to continue to work in an LNP environment, network databases must be simultaneously updated with information reflecting the fact that subscribers have switched from one local service provider to another. If these databases are not simultaneously updated, the possibility for looping messages between network elements arises. The present invention provides a method and system for controlling looping messages between network elements wherein a unique code for each incoming message is generated and stored along with the time the message was received. The codes for subsequently received messages are checked against the table entries to determine if the message has been previously received and, if so, how much time has passed since the message was first received. If this time is less than a threshold, the message is assumed to be looping.
REFERENCES:
patent: 5400333 (1995-03-01), Perlman
patent: 5717750 (1998-02-01), Adams, Jr. et al.
patent: 5754790 (1998-05-01), France et al.
Chien Lawrence
Edwards Debbie
Hayduk John D.
Huang Patricia
Jodidio Alexander
Bell Communications Research Inc.
Giordano Joseph
Hey David A.
Loomis Paul
Yeadon Loria B.
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