Implementing Voice over IP

Bhumip Khasnabish9780471216667, 0-471-21666-6

* Public and private networks will eventually be configured in such a way that all voice calls are routed using Internet protocols * Reviews existing and emerging standards for voice over IP * Provides detailed guidance on how to engineer an efficient VoIP network * Discusses quality of service (QoS) enforcement techniques * Shows how to prototype and test a network’s performance

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Table of contents :
IMPLEMENTING VOICE
OVER IP……Page 6
Copyright……Page 4
CONTENTS……Page 9
PREFACE……Page 13
ACKNOWLEDGMENTS……Page 17
1 Background and Introduction……Page 19
VoIP FOR RESIDENTIAL CUSTOMERS……Page 20
VoIP FOR ENTERPRISE CUSTOMERS……Page 21
FUNCTIONALLY LAYERED ARCHITECTURES……Page 24
ORGANIZATION OF THE BOOK……Page 30
REFERENCES……Page 32
VOICE SIGNAL PROCESSING……Page 33
Voice Signal Framing and Packetization……Page 34
Mechanisms and Protocols……Page 36
Packet Voice Bu ¤ ering for Delay Jitter Compensation……Page 43
QoS Enforcement and Impairment Mitigation Techniques……Page 44
Reactive Mechanisms……Page 45
Future Directions……Page 47
REFERENCES……Page 48
3 Evolution of VoIP Signaling Protocols……Page 50
H. 225 AND H. 245 PROTOCOLS……Page 52
SESSION INITIATION PROTOCOL ( SIP)……Page 53
MGCP AND H. 248/ MEGACO……Page 57
STREAM CONTROL TRANSMISSION PROTOCOL ( SCTP)……Page 59
BEARER INDEPENDENT CALL CONTROL ( BICC)……Page 60
The Promising Protocols……Page 61
Hybrid Signaling Model……Page 63
REFERENCES……Page 65
4 Criteria for Evaluating VoIP Service……Page 67
SERVICE REQUIREMENTS DURING CALL SETUP ATTEMPTS……Page 68
SERVICE REQUIREMENTS DURING A VoIP SESSION……Page 69
Voice Coding and Processing Delay……Page 70
Voice Envelop Delay……Page 71
Voice Frame Unpacking and Packet Delay Jitter Bu ¤ er……Page 73
Management of Voice Quality During a VoIP Session……Page 74
SERVICE REQUIREMENTS AFTER A VoIP SESSION IS COMPLETE……Page 75
REFERENCES……Page 76
5 A Testbed for Evaluating VoIP Service……Page 77
DESCRIPTION OF THE TESTBED/ NETWORK CONFIGURATION……Page 78
PSTN EMULATION……Page 81
IP NETWORK AND EMULATION OF NETWORK IMPAIRMENTS……Page 82
TELEPHONE CALL EMULATION SUITES……Page 83
REFERENCES……Page 85
6 VoIP Deployment in Enterprises……Page 86
IP- BASED ENDPOINTS: DESKTOP AND CONFERENCE PHONES……Page 87
IP- PBX, IP CENTREX, AND IP- BASED PBX TIE LINES……Page 89
IP- VPN AND VoIP FOR TELE- WORKERS……Page 95
WEB- BASED CALL AND CONTACT CENTERS……Page 97
Customers¡¯ Expectations……Page 99
Proactive Maintenance……Page 101
Support for Multimedia……Page 102
Improving Wired Access……Page 103
Wireless Access……Page 104
EPILOGUE……Page 106
REFERENCES……Page 109
IP- BASED TANDEM OR CLASS- 4 OR LONG- DISTANCE SERVICES……Page 111
Elements Required to O ¤ er VoIP- Based LD Service……Page 113
A Simple Call Flow……Page 114
Network Evolution Issues……Page 116
VoIP IN THE ACCESS OR LOCAL LOOP……Page 117
PSTN Networks……Page 120
An Architectural Option……Page 122
An Alternative Architectural Option……Page 123
CATV Networks……Page 125
Broadband Wireless Access ( Local Loop) Networks……Page 128
IP- BASED CENTREX AND PBX SERVICES……Page 129
EPILOGUE……Page 131
REFERENCES……Page 134
VoIP IN MULTINATIONAL CORPORATE NETWORKS……Page 135
VoIP FOR CONSUMERS¡¯ INTERNATIONAL TELEPHONE CALLS……Page 140
REFERENCES……Page 143
9 Conclusions and Challenges……Page 145
GUIDELINES FOR IMPLEMENTING VoIP……Page 147
VoIP IMPLEMENTATION CHALLENGES……Page 150
Scalable Solutions……Page 151
Legal and Public Safety ¨C Related Services……Page 152
EPILOGUE……Page 153
REFERENCES……Page 154
Appendix A Call Progress Time Measurement in IP Telephony……Page 155
Appendix B Automation of Call Setup in IP Telephony for Tests and
Measurements……Page 170
Appendix C Evaluation of VoIP Services……Page 187
Glossary of Acronyms and Terms……Page 196
INDEX……Page 223