Patent ID: 6683946
Filing Date: 2004-01-27
Classification: H04M,H04Q

Abstract:
A telecommunications system for performing a local number portability query when a call is routed through one of a plurality of local exchange carriers, said system comprising:a plurality of local service switching points, each of said local service switching points being connected to at least one of said local exchange carriers, each of said local exchange carriers having a carrier identification code associated therewith, a first local service switching point having a code list stored therein, said code list containing each said carrier identification code associated with each of said local exchange carriers requesting said first local service switching point to perform said local number portability query therefor; determining means for determining whether to perform a local number portability query for a particular call by said local service switching point by comparing said carrier identification code associated with a given local exchange carrier for said call with said code list, said first local service switching point selectively performing said local number portability query for said when said carrier identification code associated with said given local exchange carrier is in said code list; and routing means for routing said call through said given local exchange carrier to a second local service switching point said system establishing a call connection between said first and second local service switching points.