After years of experience with both VoIP in general and Asterisk I feel like sharing and present a simple overview of the Asterisk PBX.
This is a first - but complete - draft.
A  Conceptual Introduction
  1. Who should read this?

    You, the VoIP-interested geek, who never came around looking into Asterisk yet.

  2. What is the conceptual approach?
    The topic of question is outlined in general and few selected points known to be troubling are presented in detail. This will supply the reader with a basic to intermediate understanding of the topic thus making further studies as easy as possible.
Questions, Comments, Corrections?
This conceptual introduction is a work in progress. If you have comments, questions or even ideas, please, feel free to contribute them here.
Information wants to be free.