IP Telephony: Packet Based Multimedia Communications Systems - Hardcover

Hersent, Olivier

9780201619102: IP Telephony: Packet Based Multimedia Communications Systems

Hardcover

ISBN 10: 0201619105 ISBN 13: 9780201619102

Publisher: Addison-Wesley Professional, 1999

This book provides a comprehensive practical overview of the technology behind Internet Telephony, giving essential information to It professionals who need to understand the background and explore the issues involved in migrating the existing telephony infrastructure to an Ip based real time communication service. Assuming a working knowledge of Ip and Isdn networking, it addresses the technical aspects of real-time applications over Ip, with an in-depth coverage of voice and video applications and protocols. Drawing on their extensive research and practical development experience in VoIp from its earliest stages, the authors give you access to all the relevant standards and cutting-edge techniques in a single resource.

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Review:

Voice communications over the Internet--particularly the direct, sender-initiated kind--haven't yet taken off but lots of smart people say Internet telephony is going to be huge before long. In IP Telephony, three experts on getting voice signals from here to there, intact, via Internet Protocol (IP) networks hold forth on the state of the art. Like Voice over IP (VoIP) itself, their discussion is largely academic. Rather than show how to implement VoIP with any of the tools available for that purpose, the authors put most of their effort into elaborating on the specifications that govern (or at least aspire to govern) Internet telephony. It's an approach that IP telephony software developers will appreciate.

The denseness of the prose in this book is offset by high-quality conceptual diagrams. In particular, the timelines do a great job of explaining signal sequences, and flow charts communicate logical processes effectively. In the sections on the mechanics of converting sounds into bits (which are loaded with equations and other descriptions of algorithms), the discussion of the phenomena that cause signals to degrade is especially clear. As a whole, IP Telephony is a good description of a developing technology. --David Wall, amazon.com

From the Back Cover:

I recommend this book to all VoIP engineers, analysts, and IT managers who really want to know what they are talking about on the net, enjoy!"
-Jeff Pulver, founder of the VON (Voice On the Net) coalition, and the founder and president of pulver.com

Internet Telephony is now one of the most important and fastest growing technologies on the Internet, providing a viable technical and economical alternative to current telecommunication networks. Network providers and major companies are thus investigating how this emerging technology can be implemented, and at what cost and savings, in their organizations.

This book provides a comprehensive practical overview of the technology behind Internet Telephony, giving essential information to IT professionals who need to understand the background and explore the issues involved in migrating the existing telephony infrastructure to an IP based real time communication service. Assuming a working knowledge of IP and ISDN networking, it addresses the technical aspects of real-time applications over IP, with an in-depth coverage of voice and video applications and protocols. Drawing on their extensive research and practical development experience in VoIP from its earliest stages, the authors give you access to all the relevant standards and cutting-edge techniques in a single resource.

IP Telephony is organized into three clearly structured sections, focusing on protocols, voice technology and networks with a step-by-step approach. The protocols section sets IP telephony in context and then covers H.323, SIP and MGCP in detail, examining in turn their pros and cons, and using examples of particular cases and scenarios. The voice technology section describes voice quality, including the ETSI TIPHON approach, and voice coding, with summary comments on the applicability to VoIP telephone gateways. The final section on networks addresses Quality of Service (QoS) issues, explores dimensioning a VoIP network, and introduces Multicast routing, including a perspective on security and MBONE applications.

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