Number portability for a cluster of switches

Details Number portability for a cluster of switches Number portability for a cluster of switches

1996-12-27

1999-11-30

Hong, Harry S.

Telephonic communications

Special services

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379211, 379221, 379225, H04M 342, H04M 700

Patent

active

059956097

ABSTRACT:
To provide station number portability within a cluster of switches interconnected in a communication switching network each switch within the cluster is provided with two translation tables stored in the main memory of the switch processor. When digits are dialled to connect a station with another station the office code of the dialled station is extracted and if this is an office code of any switch in the cluster the first translation table instructs that a translation be carried out in the second table. The second table contains all the station numbers which are in the cluster and relates these numbers either to a physical line or to an instruction to route to another switch. When a station is "ported" i.e., physically disconnected from one switch and reconnected to another switch, a minor change is made to the second translation table of the two switches to retain portability.

REFERENCES:
patent: 4754479 (1988-06-01), Bicknell et al.
patent: 5255315 (1993-10-01), Bushnell
patent: 5583929 (1996-12-01), Ardon
patent: 5625681 (1997-04-01), Butler, II
patent: 5689555 (1997-11-01), Sonnenberg
patent: 5717749 (1998-02-01), Sneed, Jr. et al.
patent: 5764745 (1998-06-01), Chan et al.
patent: 5793857 (1998-08-01), Barnes et al.
"Generic Switching and Signalling Requirements for Number Portability" (FSD30-12-0001); Nov. 20, 1995 by the Illinois Number Portability Workshop .

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