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This book provides a collection of 15 excellent studies of Voice over IP (VoIP) technologies. While VoIP is undoubtedly a powerful and innovative communication tool for everyone, voice communication over the Internet is inherently less reliable than the public switched telephone network, because the Internet functions as a best-effort network without Quality of Service guarantee and voice data cannot be retransmitted. This book introduces research strategies that address various issues with the aim of enhancing VoIP quality. We hope that you will enjoy reading these diverse studies, and that the book will provide you with a lot of useful information about current VoIP technology research.

Internet telephony. --- Internet-based telephony --- Internet phone --- Internet telephone --- IP telephony --- Voice over IP networks --- Telephone systems --- Computer networking & communications

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Internetworking (Telecommunication) --- Internet telephony --- Internet-based telephony --- Internet phone --- Internet telephone --- IP telephony --- Voice over IP networks --- Telephone systems

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This book is written in an easy-to-read style, with a strong emphasis on real-world, practical examples. Step-by-step explanations are provided for performing important administration tasks. If you are Cisco Unified Communications administrators or engineers looking forward for advanced recipes to perform important administration tasks, then this is the best guide for you. This book assumes familiarity with the basics of Cisco's Unified Communications Manager architecture.

Internet telephony. --- Internet-based telephony --- Internet phone --- Internet telephone --- IP telephony --- Voice over IP networks --- Telephone systems

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Asterisk Hacking shows readers about a hacking technique they may not be aware of. It teaches the secrets the bad guys already know about stealing personal information through the most common, seemingly innocuous, highway into computer networks: the phone system. The book also comes with an Asterisk Live CD (SLAST) containing all the tools discussed in the book and ready to boot!This book shows readers what they can do to protect themselves, their families, their clients, and their network from this invisible threat. Power tips show how to make the most out of the phone system a

Internet telephony. --- Internet telephony --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Telecommunications --- Internet-based telephony --- Internet phone --- Internet telephone --- IP telephony --- Voice over IP networks --- Telephone systems

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The first book published on deploying Voice Over IP (VoIP) products from Nortel Networks, the largest supplier of voice products in the world.This book begins with a discussion of the current protocols used for transmitting converged data over IP as well as an overview of Nortel's hardware and software solutions for converged networks. In this section, readers will learn how H.323 allows dissimilar communication devices to communicate with each other, and how SIP (Session Initiation Protocol) is used to establish, modify, and terminate multimedia sessions including VOIP telephone calls

Internet telephony. --- Multimedia connections. --- Internet-based telephony --- Internet phone --- Internet telephone --- IP telephony --- Voice over IP networks --- Telephone systems --- Information Technology --- General and Others