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Pbx Systems For Ip Telephony / Edition 1
     

Pbx Systems For Ip Telephony / Edition 1

by Allan Sulkin
 

ISBN-10: 0071375686

ISBN-13: 9780071375689

Pub. Date: 04/24/2002

Publisher: McGraw-Hill Professional Publishing

Calling all—

* telecom managers

* datacom managers with voice responsibilities

* Call Center managers

* VoIP implementers

* network integrators

* product and service developers

* industry analysts

"Clear and precise analysis and discussion of PBX system design and capabilities. Allan Sulkin has a unique ability to explain complex systems in

Overview

Calling all—

* telecom managers

* datacom managers with voice responsibilities

* Call Center managers

* VoIP implementers

* network integrators

* product and service developers

* industry analysts

"Clear and precise analysis and discussion of PBX system design and capabilities. Allan Sulkin has a unique ability to explain complex systems in easily understandable terms." — Joe Licata, President, Siemens Enterprise Networks

"A welcome addition to the bookshelf for anyone interested in the evolving IP-PBX system. Voice and data communications managers alike will greatly benefit from this text." — Michael Thurk, Avaya, Group Vice President - Systems

"Allan Sulkin's solid expertise and critical insight has been a valuable resource for the telecommunications community for over 20 years. He is uniquely qualified to articulate the very complex subject of PBX and IP telephony." — Kanji Suzuki, former EVP of NEC America and current president and CEO of NEC Infrontia, Inc.

The most efficient (and economical) ways to bring enterprise communication systems into the Digital Age are in this guide, written by the foremost analyst in the markret space. In PBX Systems for IP Telephony, Allan Sulkin—consultant and advisor to Avaya, Siemens, Cisco, NEC, Alcatel and other world-class companies—evaluates technologies, markets, and best practices for enterprise voice systems, messaging, and customer contact centers.

The heart and brains of your communications network, the PBX (Private Branch Exchange) can be the vital link—or the missing link—that interfaces businesses and their customers. This guide, from the recognized expert in telephony systems, provides answers. Whether you need to IP-enable a PBX system for a small business, make complex choices for the advanced call center, or gain the expertise to integrate a variety of communication systems into a state-of-the-art foundation for your e-business vision, PBX Systems for IP Telephony should be your first choice. Here's why:

* No one knows PBX systems and markets better than the author, and no one is better at explaining them

* This comprehensive resource supplies nuts-and-bolts information on costs, performance, risks, and other real-world considerations difficult to research

* You get insights into the potential strengths and weaknesses of next-generation PBX systems

* You'll consult the consultant to the system designers for practical advice on systems that fit your needs and your future

* There's no more business-aware or user-friendly guide anywhere to converging your voice systems with your IP-based data systems

When it comes to the PBX, the question often seems to be "Who's job is it anyway?" With this guidebook, you'll be ready to take the responsibility—and get the credit.

Product Details

ISBN-13:
9780071375689
Publisher:
McGraw-Hill Professional Publishing
Publication date:
04/24/2002
Series:
McGraw-Hill Telecom Series
Pages:
487
Product dimensions:
1.00(w) x 9.69(h) x 7.44(d)

Table of Contents

Chapter 1Enterprise Communications Systems Today1
The Fundamental Enterprise Communications Systems5
KTS5
PBX6
Hybrid System7
ACD Systems8
Voice Messaging System9
Interactive Voice Response System11
Convergence of KTS/Hybrid and PBX Systems11
Chapter 2Evolution of the Digital PBX, 1975-200015
Digital Switching/Transmission17
Computer Stored Program Control20
Digital Desktop22
Modular System Design24
Feature/Function Enhancements28
Basic Voice Call Station/System Features28
Data Communications31
Video Communications33
Networking34
ACD-based Call Centers36
Computer Telephony Integration (CTI)38
Mobile Communications41
Messaging42
Chapter 3Legacy PBX Call Processing Design45
Fundamentals of PBX Circuit Switching47
Time Division Multiplexing47
Pulse Code Modulation48
TDM Bus Bandwidth and Capacity49
Port-to-Port Communications over a Single TDM Bus51
Multiple TDM Bus Design52
PBX Circuit Switching Design54
Center Stage Switch Complex55
Broadband TDM Bus56
Single-Stage Circuit Switch Matrix57
Multistage Circuit Switch Matrix58
ATM Center Stage59
Local Switching Network Design: TDM Buses and Highway Buses60
PBX Switch Network Topologies64
Centralized65
Distributed and Dispersed Switch Network Designs67
PBX Switch Network Issues71
Switch Network Redundancy71
Time Slot Access and Segmentation73
Time Slot Availability: Blocking or Nonblocking75
Chapter 4Legacy PBX Switch Network Design79
Nonblocking/Blocking PBX Systems80
PBX Grade of Service (GoS)82
Defining PBX Traffic: CCS Rating83
Trunk Traffic Engineering88
Determining Trunk Circuit Requirements92
Chapter 5Legacy PBX Traffic Engineering Analysis95
Common Control Complex96
Main System Processor98
Operating System Platform98
Basic Call Processing Functions100
Main System Memory103
Local Processors104
Port Circuit Card Microcontrollers104
Cabinet/Carrier Shelf Local Controllers105
System Processing Bus106
PBX Call Processing Design Topologies107
Centralized Control108
Dispersed Control110
Distributed Control111
Call Processing Redundancy Issues112
PBX Call Processing Power: BHC Rating116
Chapter 6Legacy PBX Common Equipment121
System Cabinets123
Carrier Types126
Control126
Switching126
Port127
Auxiliary128
Application128
Power129
Cabinet Power System129
Cabinet Backplane132
Cabinet/Carrier Expansion Requirements132
Port Growth133
Increased Traffic Requirements133
Increased Call Processing Requirements133
New Application Requirements133
Printed Circuit Boards134
Control Cards136
Local Loop Interfaces: Maintenance/Diagnostic137
Service Cards137
Port Cards139
Circuit Card Provisioning Issues143
TDM Bus Time/Talk Slot Restrictions143
Call Processing Limitations144
Power Distribution Limitations144
Card Slot Requirements144
Chapter 7Introduction to IP-PBX Systems147
ToIP and IP-PBX Systems150
IP-PBX SYSTEM: Benefits and Advantages154
Leverage Existing Investment in LAN/WAN Infrastructure154
Reduce Capital, Network, and Operating Expenses154
Simplify System and Network Configuration Upgrades and Expansion155
Conforms to Standards156
Support of Applications across the Enterprise156
Availability of New and Improved Station User Features and Applications157
The Case for Converged IP-PBX Systems158
ToIP Requirements159
Investment Protection160
Critical Reliability162
Private Network Compatibility163
Feature Requirements165
Pricing166
The Case for the Client/Server IP-PBX169
Converged Network170
Universality of IP Transport171
Network Bandwidth171
Simplified Centralized Management and Administration172
Rapid Deployment of New Technology and Applications172
Fully Distributed Network Design172
Scalability173
Chapter 8VoIP Standards and Specifications175
ITU-T H.323176
Point-to-Point and Multipoint Conferencing Support177
Internetwork Interoperability177
Heterogeneous Client Capabilities178
Audio and Video Codecs178
Management and Accounting Support178
Security178
Supplementary Services178
H.323 Benefits179
H.323 Architecture Components180
Terminal181
Gateway181
Gatekeeper181
Multipoint Control Unit182
Border Elements183
H.323 Architecture Protocols and Procedures183
Call Signaling and Control183
H323 Annexes184
Audio Codecs184
Video Codecs184
H.323 Audio Codecs186
H.323 Control and Signaling Mechanisms186
H.225.0 RAS188
Gatekeeper Discovery188
Endpoint Registration188
Endpoint Location188
Other Communications188
H.225.0 Call Signaling189
H.245 Media Control189
Capability Exchange190
Opening and Closing of Logical Channels190
Flow Control Messages190
Other Commands and Messages190
The Need for RTP/RTCP190
Real-Time Transport Protocol192
RTP Payload192
RTP Packet193
RTCP Packet193
Real-Time Transport Control Protocol194
SIP197
SIP Call Process199
SIP Addressing199
Locating a SIP Server200
SIP Transaction200
SIP Invitation200
H.323 or SIP?201
Emerging Dominance of IP201
Signaling Reliability Mechanism201
Client/Server Design201
Addresses202
Complexity and Cost202
Command/Message Format202
QoS Management203
Firewall/Proxy Design and Configuration203
Extendible and Scalable203
Other Protocols: MGCP and MEGACO (H.248)204
Chapter 9Converged IP-PBX System Design207
IP Station Ports208
Making IP Voice Calls214
IP Trunk Ports216
Dispersed Common Equipment over LAN/WAN Infrastructure220
Upgraded Circuit Switched PBX220
Distributed Modular Design223
Chapter 10Client/Server IP-PBX System Design227
Telephony Call Server230
Server Operating System232
Server Redundancy233
Multifunction Server Design239
Telephony Gateways242
Summarizing Client/Server IP-PBX Design Issues247
Chapter 11LAN/WAN Design Guidelines for VoIP251
Fundamental LAN Planning Guidelines254
Factors Affecting QoS: Packet Loss and Latency260
Packet Loss260
Latency262
QoS Controls268
802.1p/Q268
ToS269
Differentiated Services (DiffServ)270
QoS Control Summary Points271
A Final QoS Factor: Echo272
TIA IP Telephony QoS Recommendations272
Chapter 12PBX Cabling Guidelines277
Cabling System Fundamentals279
Cable Interference and Noise Issues281
Overview of ANSI/TIA/EIA 568283
Entrance Facility284
Equipment Room284
Backbone Cabling284
Telecommunications Closet285
Horizontal Cabling286
Telecommunications Outlet289
Work Area290
Overview of ANSI/TIA/EIA 569291
Chapter 13PBX Voice Terminals295
Voice Terminal Categories297
Analog Telephones298
Digital Telephones299
IP Telephone Design Basics303
Distinct IP Telephony Features/Functions305
Desktop Voice Terminal Attributes317
Power Requirements324
Chapter 14PBX Networking325
Public Networking326
Automatic Route Selection (ARS)326
ISDN Features328
ANI/SID329
CBCSS330
Private Networking332
Single System PBX Network: On-net Multilocation Support332
Distributed PBX Common Equipment Design335
Remote Port Cabinet Options337
Multiple System Private Networking341
Fundamentals of PBX Private Networks343
Uniform Dial Plan (UDP)344
Automatic Alternate Routing (AAR)345
FRLs and Network Class of Service (NCOS)345
Automatic Circuit Assurance (ACA)346
Virtual Private Networks (VPNs)346
Intelligent Feature Transparent Network (IFTN)349
IFTN Features and Functions351
Qsig354
Qsig Architecture356
Qsig Supplementary Services and ANFs356
Chapter 15PBX Systems Management and Administration359
System Administration361
Administration Sequence361
Performance Management365
Trunk Usage and Traffic365
Attendant Consoles365
Stations366
Traffic Distribution366
Busy Hour Traffic Analysis366
Processor Occupancy366
Threshold Alarms366
Feature Usage367
VoIP Gateways367
CDR367
Directory369
Inventory369
Cabling369
System Diagnostics and Maintenance369
Appendix ACall Processing Feature/Function Glossary and Definitions373
Appendix BPBX/IP-PBX Cost and Pricing Issues399
Appendix CClient/Server IP-PBX RFP Example407
Appendix DPBX/IP-PBX System Feature and Function Matrices445
Index469

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