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ROADMAP-TO-NGN-1
Roadmap to NGN Documents Issue 2, August 2008
Your Roadmap to NGN Documents
3–28
and applications that IP Centrex customers can enjoy - the advantages IP Centrex
offers to service providers - the technical hurdles that equipment suppliers and
service providers must address before IP Centrex service can be offered - how IP
Centrex and IP PBX compare to each other. This SR is intended for three types of
readers: - Enterprise customers currently using conventional Centrex or
conventional PBXs. The information in this SR can help customers in their
discussions with potential service providers or PBX suppliers. (Note the SR does
not discuss the capabilities of any particular PBX model or Centrex offering.) -
Service providers, including Local Exchange Carriers and Application Service
Providers. The information in this SR can help service providers better evaluate
various alternatives as they formulate IP Centrex plans. - Suppliers of IP Centrex
network equipment or CPE. The information in this SR can help equipment
suppliers better understand the challenges that their service provider customers are
facing. With the Notes on . . . series, Telcordia Technologies has devised a starting
point for your search through the rapidly developing world of telecommunications.
Written by the authors of the successful Telcordia Notes on the Network document
(SR-2275), this series similarly contains technical material of interest to
engineering and planning groups, as well as descriptions of the characteristics and
background of these subjects in layman's terms. The difference is that Telcordia
Notes on . . . zeros in on one technology in each document and breaks it down into
manageable terms. From the history, background, and basic elements through a
discussion of what the future may bring, our subject matter experts cover the
important aspects in as few words as possible. The CD-ROM version of this
document is packaged together with the paper edition as an added bonus.
Contents
1. Introduction
2. Centrex History
3. IP Centrex Architectures
3.1 Class 5 Switch Architecture
3.2 Softswitch Architecture
3.3 IntraLAN Voice Paths
4. IP Centrex Customer Premises Equipment (CPE)
4.1 Station Equipment
5. Benefits of IP Centrex for Customers
5.1 General Centrex Benefits
5.2 IP Centrex Benefits
6. IP Centrex Applications and Configurations
6.1 The Introduction of IP Phones
6.2 Replacement of Legacy Station Equipment with IP Phones
6.3 Hotelling
6.4 The Use of Customer Gateways
6.5 Unrestricted Multilocation Centrex for Branch Offices