Is Linux Voice over IP Ready? | Linux Journal

Linux Journal has a nice introduction to some of the various soft-clients available for doing VoIP, with or without a server involved: Is Linux Voice over IP Ready?.

What is Voice over IP really? What do you need for Voice over IP? What do you mean, I can't call my girlfriend? What's all that buzz about open and proprietary protocols? Can I start my own telecom service? This article addresses these questions and compares the most popular Linux applications for calling and conferencing.