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.

� propos de l?auteur:

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 VolP architectural designs including enhanced H.323 servers. With the emergence of VolP, 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. Jean-Pierre Petit is head assistant of a France T�l�com R&D (CNET) laboratory involved in speech and audio coding, acoustics, speech recognition, text to speech synthesis and intelligent dialog. He actively contributed to many international standardization processes of speech and audio coders and participated in the definition and implementation of ITU-T and ETSI speech coders such as GSM full rate and G.723.1. He holds several international patents in the digital signal-processing domain and has contributed to a number of international publications.

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