Voice over IP Fundamentals- Chapter 1: Overview of the PSTN and Comparisons to Voice over IP

Voice over IP Fundamentals

The Public Switched Telephone Network (PSTN) has been evolving ever since Alexander Graham Bell made the first voice transmission over wire in 1876. But before explaining the present state of the PSTN and what's in store for the future, it is important that you understand PSTN history and its basics. As such, this chapter discusses the beginnings of the PSTN and explains why the PSTN exists in its current state.

Voice over IP Fundamentals provides a thorough introduction to this new technology to help experts in both the data and telephone industries plan for the new networks.

You will learn how the telephony infrastructure was built ...

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and how it works today, the major concepts concerning voice and data networking, transmission of voice over data and IP signaling protocols used to interwork with current telephony systems. The authors cover various benefits and applications of VoIP and how to ensure good voice quality in your network.

This book is part of the Networking Technology Series from Cisco Press, which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers.

Reproduced from the book Voice over IP Fundamentals. Copyright 2000, Cisco Systems, Inc. Reproduced by permission of Pearson Education, Inc., 800 East 96th Street, Indianapolis, IN 46240. Written permission from Pearson Education, Inc. is required for all other uses. Visit www.ciscopress.com for a detailed description and to learn how to purchase this title. ISBN: 1578701686