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   IP Centrex System

A system that provides Centrex services to customers using Internet protocol (IP) connections. IP Centrex allows customers to have and use features that are typically associated with a private branch exchange (PBX) without the purchase of PBX switching systems.

This figure shows a basic IP Centrex system that allows a local exchange company (LEC) in New York City to provide Centrex services to a company in Los Angeles. In this diagram, the LEC in New York City uses a class 5 switch to provide for plain old telephone (POTS) and Centrex services to their local customers. The Centrex software is installed in the switch and existing Centrex customers in the local area continue to connect their telephone stations directly to the Class 5 switch. To provide Centrex services to new customers located outside the geographic area, the LEC has installed a network gateway in New York that can communicate with the customer gateway in Los Angeles. Because the network gateway converts all the necessary signaling commands to control and communicate with the customer gateway, the class 5 switch does not care if the customer gateway is in Los Angeles or Tokyo. It simply provides the Centrex services as the users request.

IP Centrex System Diagram

IP Centrex System Diagram

 

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