System and method for inter-working centrex with a managed VoIP provider

摘要

A system for telephone service includes a Centrex served location and a voice over Internet protocol (VoIP) provider served location electrically coupled to the Centrex served location using an IP network. The Centrex served location has an end point from the VoIP provider served location, and users of the system call endpoints at the Centrex served location and endpoints at the VoIP provider served location using abbreviated dialing without incurring local or toll usage charges.