July 2006
Beginner
432 pages
9h 6m
English
book
Voice over IP Fundamentals, Second Edition
by Jonathan Davidson, James Peters, Manoj Bhatia, Satish Kalidindi, Sudipto Mukherjee
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Chapter 1. Overview of the PSTN and Comparisons to Voice over IP
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.
This chapter also covers PSTN basics, components, and services to give you a good introduction to how the PSTN operates today. Finally, it discusses where the PSTN could be improved and ways in which it and other voice networks are evolving to the point at which they combine ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.