Voice over IP Networks (eBook)

Preface 5
Contents 7
Introduction 11
1.1 Motivation for VoIP Networks 11
1.2 Comparison of PSTN and VoIP Networks 14
1.3 Major Challenges in VoIP Networks 15
1.4 Scope of this Book 17
1.5 Organization of the Book 17
Voice over Internet Protocol 19
2.1 VoIP Architecture 19
2.2 Quality of Service 22
2.3 VoIP Implementation 24
2.4 Session Initiation Protocol 26
2.5 Summary 33
Traffic Characterization 34
3.1 Packet-switched Network Model 35
3.2 Queuing Model 35
3.3 Analysis of the Delay Bound 38
3.4 Summary 42
Impact of Bounded Delays on Resource Consumption in Packet- Switched Networks with M/ M/ 1 Traffic 43
4.1 Introduction 43
4.2 The SIP-based VoIP Network Model 44
4.3 A Single-Hop VoIP Network 45
4.4 Two-Hop Tandem Network 48
4.5 Multiple-Hop Network 50
4.6 Simulation Results 52
4.7 Conclusion 54
Impact of Bounded Delay on Resource Consumption- M/ D/ 1 Model 56
5.1 Introduction 56
5.2 Network Model 57
5.3 A Single-Hop Network 58
5.4 Two-Hop Tandem Network 60
5.5 Multi-Hop Network 62
5.6 Simulation Results 63
5.7 Conclusion 69
Impact of Bounded Jitter on Resource Consumption in Multi- Hop Networks 70
6.1 Introduction 70
6.2 Jitter Analysis 71
6.3 Impact of the Number of Hops on Jitter 72
6.4 Conclusions 76
Cost and Quality in Packet Switched Networks 77
7.1 Introduction 77
7.2 A QoS Based Pricing Model 79
7.3 Mathematical Model of a VoIP Network 79
7.4 Analysis of the Single-Hop VoIP Network 80
7.5 Analysis of Two-Hop VoIP Network 85
7.6 Analysis of Multi-Hop VoIP Network 89
7.7 Conclusion 91
Cumulative Impact of Inhomogeneous Channels on Risk 92
8.1 Introduction 92
8.2 The Single Channel Model 93
8.3 The Two-channel Model 94
8.4 The n-Channel Model 98
8.5 Conclusion 99
8.6 Further Extensions of the Technique 99
The Economics of VoIP Systems 100
9.1 Introduction 100
9.2 Economy of Scale of Communication Networks 101
9.3 Economic Characteristics of an Information Network 103
9.4 Major Components of a Telecommunications Network 105
9.5 The Integrated Local Loop 107
9.6 Architectural Dissimilarities Between the Internet and the Legacy Network 108
9.7 Access Network as the Bottleneck 109
9.8 Pricing of Internet Services 110
9.9 The Overall Impact on VoIP Pricing 111
9.10 The Likely Evolution Toward a Single Network 112
9.11 Conclusions 114
A Network Based Authentication Scheme for VoIP 115
10.1 Introduction 115
10.2 Authentication 117
10.3 Comparative Analysis of Existing Authentication Schemes 118
10.4 Proposed Requirements of Authentication 119
10.5 Proposed Schemes for Authentication 119
10.6 Conclusion 122
Conclusions and Future Work 123
Index 131