Patent ID: 7664251

Claim:
A system, comprising: a Voice over Internet Protocol (VoIP) feature server that provides an abbreviated dialing feature over a VoIP platform of an Internet Protocol (IP) network to facilitate abbreviated dialing between a Private Branch Exchange (PBX) that serves a first customer location and a Centrex group that serves a second customer location, the Centrex group provided by a central office switch having a customized dialing plan (CDP) trigger to trigger a query to the VoIP feature server when an abbreviated-dialed call originated from the Centrex group is not recognized by the central office switch as an intra-Centrex call, wherein the central office switch includes a Primary Rate Interface (PRI) facility that is part of the Centrex group, wherein the PBX includes a first routing table that stores a number range of the Centrex group with instructions to route abbreviated-dialed calls to a first Integrated Access Device (IAD), and wherein the first routing table stores a number range of a VoIP customer local area network (LAN) with instructions to route abbreviated- dialed calls to the first IAD wherein the VOIP customer LAN is located at a third customer location, wherein the query from the central office switch is processed at a Service Control Point (SCP) that includes a second routing table, wherein the second routing table of the SCP stores a number range of the VOIP customer LAN with instructions to direct the central office switch to route abbreviated-dialed calls to the PRI facility interfaced to a second IAD, wherein the second IAD is located at the second customer location, and wherein the abbreviated-dialed call is communicated to the IP network by the second IAD interfaced to the PRI facility.