Buch, Englisch, 288 Seiten, Format (B × H): 175 mm x 252 mm, Gewicht: 635 g
Understanding Voice Technology and Networking Techniques for IP Telephony
Buch, Englisch, 288 Seiten, Format (B × H): 175 mm x 252 mm, Gewicht: 635 g
ISBN: 978-0-470-02362-4
Verlag: Wiley
In 1999-2000, VoIP (Voice-over-IP) telephony was one of the most successful buzzwords of the telecom bubble era. However, in 2001-2003, VoIP faced a very tough reality check. Now, manufacturers and service providers are drawing on what they have learnt from past experience in order to prepare to participate in the next major challenge faced by the telecommunications industry.
This book offers a comprehensive overview of the issues to solve in order to deploy global revenue-generating effective "multimedia" services. Drawing on extensive research and practical deployment experience in VoIP, the authors provide essential advice for those seeking to design and implement a post-bubble VoIP network.
Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony
- Introduces the basics of speech coding and voice quality
- Demonstrates how quality of service may be built into the network and deals with dimensioning aspects, e.g. multipoint communications and how to model call seizures.
- Explores the potential of multicast to turn an IP backbone into an optimized broadcast medium
- Includes amply illustrated, state-of-the-art practical advice for formulating a complete deployment strategy
A companion volume to "IP Telephony: Deploying VoIP Protocols", this book takes the reader a stage deeper into how to prepare the network and exploit VoIP technology to its full potential.
Autoren/Hrsg.
Fachgebiete
Weitere Infos & Material
Glossary xi
List of Abbreviations xv
1 Introduction 1
1.1 There birth of VoIP 1
1.2 Why beyond VoIP protocols? 2
1.3 Scope of this book 5
1.4 Intended audience 6
1.5 Conclusion 7
1.6 References 7
2 Introduction to Speech-coding Techniques 9
2.1 A primer on digital signal processing 9
2.2 The basic tools of digital signal processing 20
2.3 Overview of speech signals 32
2.4 Advanced voice coder algorithms 39
2.5 Waveform coders.ADPCMITU-TG.726 47
2.6 Hybrids and analysis by synthesis(ABS)speech coders 56
2.7 Codebook-excited linear predictive(CELP)coders 61
2.8 Quality of speech coders 74
2.9 Conclusion on speech-coding techniques and their near future 81
2.10 References 84
2.11 Annexes 86
3 Voice Quality 89
3.1 Introduction 89
3.2 Reference VoIP media path 90
3.3 Echo in a telephone network 91
3.4 Delay 101
3.5 Acceptability of a phone call with echo and delay 107
3.6 Conclusion 114
3.7 Standards 115
4 Quality of Service 117
4.1 Introduction: What is QoS? 117
4.2 Describing a data stream 118
4.3 Queuing techniques for QoS 120
4.4 Signaling QoS requirements 130
4.5 The Cable Labs Packet Cable quality-of-service specification: DQoS 154
4.6 Improving QoS in the best effort class 170
4.7 Issues with slow links 174
4.8 Conclusion 179
4.9 References 181
5 Network Dimensioning 183
5.1 Simple compressed voice flow model 183
5.2 Building a network dedicated to IP telephony 199
5.3 Merging data communications and voice communications on one common IP backbone 203
5.4 Multi point communications 206
5.5 Modeling call seizures 212
5.6 Conclusion 224
5.7 References 225
6 IP Multicast Routing 227
6.1 Introduction 227
6.2 When to use multicast routing 227
6.3 The multicast framework 230
6.4 Controlling scope in multicast applications 236
6.5 Building the multicast delivery tree 238
6.6 Multicast-routing protocols 241
6.7 Them Bone 249
6.8 MULTICAST issues on non-broad cast media 253
6.9 Conclusion 254
6.10 References 255
Index 257
