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In the chapter, "Trunks—Connecting to the
Outside World " there is a discussion on why one needs a trunk, what one needs for a PSTN
line, what to look for in a VoIP provider, the equipment needed, analog lines, call
quality, disaster recovery, and finally how to integrate a trunk into 3CX using the
easy-to-use wizards.

In this article, you learn how to install and prepare Linux for the OpenSIPS installation. We download and compile OpenSIPS with the Radius and MySQL modules. After the installation, we include the OpenSIPS init file to start OpenSIPS at boot time.

Installing OpenVPN is easy and platform independent. In this article by Markus Feilner, we will see how to install it on Windows Server, Vista, and Mac OS X. For both operating systems, there are software packages available that can be downloaded very easily from the relevant web sites.

Installing OpenVPN is easy and platform independent. Modern Linux systems, such as SuSE, Red Hat, Debian, or Ubuntu, provide sophisticated installation and package management systems, and still offer other ways to install the software. In this two-part article by Markus Feilner, we will install it on different Linux versions and FreeBSD.

In this article by Reynante Martinez, we will learn about photo compositing with The GIMP.

This tutorial will help you develop applications using Seam. You will learn the basic structure of a seam application and Seam components. You'll also see see exactly how Seam bridges the gap between the Web tier and the Server tier.