Kashihara S. (ed.) VoIP Technologies

Kashihara S. (ed.) VoIP Technologies
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Издательство InTech, 2011, -346 pp.

Voice over IP (VoIP) is undoubtedly a powerful and innovative communication tool. Compared with the public switched telephone network (PSTN), VoIP off ers the benefi t of reducing communication and infrastructure cost. This makes it possible for everyone to easily keep in touch with family, friends, and clients around the world. Furthermore, VoIP has the potential to create new and att ractive communication tools by integrating with various applications, such as Web systems, presentation soft ware, and photo viewers. In the near future, we expect VoIP to provide a rich multimedia communication service.
However, voice communication over the Internet is inherently less reliable than PSTN.
Since the Internet essentially works as a best-eff ort network without a Quality of Service (QoS) guarantee, and since voice data cannot be retransmitt ed, voice quality may suff er from packet loss, delay, and jitt er due to interference from other data packets. In wireless networks, such problems may be compounded by various characteristics of wireless media, including reduction of signal strength and radio interference. Additionally, we need to pay closer att ention to security issues related to VoIP communications. Thus, VoIP technologies are challenging research issues.
This book comprises 15 chapters and encompasses a wide range of VoIP research, from VoIP quality assessment to security issues. Much of the content is focused on the key areas of VoIP performance investigation and enhancement. Each chapter includes various approaches that illustrate how VoIP aspires to be a powerful and reliable communication tool. We hope that you will enjoy reading these diverse studies, and will fi nd a lot of useful information about VoIP technologies. Finally, I would like to thank all authors of the chapters for their great contributions.

VoIP Quality Assessment Technologies
Assessment of Speech Quality in VoIP
Enhanced VoIP by Signal Reconstruction and Voice Quality Assessment
An Introduction to VoIP: End-to-End Elements and QoS Parameters
Influences of Classical and Hybrid Queuing Mechanisms on VoIP’s QoS Properties
VoIP System for Enterprise Network
An Opencores/Opensource Based Embedded System-on-Chip Platform for Voice over Internet
Experimental Characterization of VoIP Traffic over IEEE 802.11 Wireless LANs
VoIP Over WLAN: What About the Presence of Radio Interference?
VoIP Features Oriented Uplink Scheduling Scheme in Wireless Networks
Scheduling and Capacity of VoIP Services in Wireless OFDMA Systems
Reliable Session Initiation Protocol
Multi-path Transmission, Selection and Handover Mechanism for High-Quality VoIP
End-to-End Handover Management for VoIP Communications in Ubiquitous Wireless Networks
Developing New Approaches for Intrusion Detection in Converged Networks

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