IP Telephony

"This book embraces all of the fields that the VoIP professional needs to be aware of in a clear and organized way... 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.

Features: *detailed, up-to-date coverage of voice and video applications and emerging protocol standards:H.323, SIP, MGCP
*practical strategies on how to plan and dimension a VoIP network
*key points to look for in choosing a VoIP product & how to avoid common pitfalls in implementation
*examples and illustrations of standards and techniques including feedback information on issues discussed at standards meetings
*details of QoS issues, Intserv (RSVP), DiffServ, RTP, SDF, companion standards, multimedia coding standards and coding algorithms<

Olivier Hersent founded the company NetCentrex with colleagues in 1999.

Previously he has worked as a research engineer at France Telecom R&D laboratories

(CNET) where he focused on IP security, Multicast and QoS and was also responsible

for CNET VoIP architectural designs including enhanced H.323 servers. With the

emergence of VoIP, he has participated in various standards organizations, such

as ETSI TIPHON.

David Gurle works for Microsoft, having spent two years as the Vice-President

of Business Alliances at VocalTec where he lead business development activities

and strategic aspects of IP Telephony standardization and technology in IETF,

ITU and ETSI. He has also worked for the European Telecommunications Standards

Institute, overseeing several standardization committees and founding the TIPHON

project and receiving the ETSI Service award.

Samuel A. Rebelsky is an assistant professor of computer science at Grinnell College where he has designed an object-oriented data structures and algorithms course, and developed Java laboratories to support that and other introductory-level courses. He taught as a visitor at Dartmouth College from 1993 to 1997, and has taught Java to professionals and educators at the EdMedia World Conference on Educational Multimedia and the WebNet World Conference. Rebelsky's research interests include computer science education, computers in education, hypertext, and programming languages. Professor Rebelsky received his Ph.D. in computer science from the University in Chicago in 1993

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