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This book addresses three important issues in VoIP networks: Quality of Service, pricing and security. It also develops a pricing model based on the Quality of Service provided in VoIP networks and explores areas for future research.

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Introduction.- Voice over Internet Protocol.- Traffic Characterization.- Impact of Bounded Delays on Resource Consumption in Packet Switched Networks with M/M/1 Traffic.- Impact of Bounded Delay on Resource Consumption-M/D/1 Model.- Impact of Bounded Jitter on Resource Consumption in Multi-hop Networks.- Cost and Quality in Packet Switched Networks: An Abstract Approach.- Cumulative Impact of Inhomogeneous Channels on Risk.- A Network Based Authentication Scheme for VoIP.- Conclusions and Future Work.

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