August 2007
Intermediate to advanced
384 pages
9h 12m
English
book
Securing VoIP Networks: Threats, Vulnerabilities, and Countermeasures
by Peter Thermos, Ari Takanen
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Chapter 1. Introduction
The convergence of land-line, wireless, and Internet communications has stimulated the development of new applications and services which have revolutionized communications. The interconnection between PSTN (Public Switch Telephone Network) and IP (Internet Protocol) networks is referred to as the Next Generation Network (NGN). And the interconnection of Internet and wireless is referred to as IP Multimedia Subsystem (IMS). Both architectures play an important role in our evolution from traditional telecommunications to multimedia communications. You might also have heard of the term triple play, which refers to a service provider’s ability to offer voice, video, and data to subscribers as a bundled service. Similarly, ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.