After quite some time now, this is not only yet another comment about the world and its inhabitants, but foremost the attempt to bring the world a little closer to each of us by seamlessly spilling bits and pieces of information commonly referred to as knowledge. And what knowledge would suit better in this context than the one about intriguing means of communication?
The Asterisk Open Source PBX has been around for some time now, even forked once or twice. However in order to truly grasp its inner secrets your can now start by reading this Conceptual Introduction.
Enjoy the ride.