Asterisk is the world's leading open-source PBX, telephony engine, and telephony applications toolkit with immense flexibility. 'Asterisk Gateway Interface 1.4 and 1.6 Programming' book by 'Nir Simionovich' will give you a firm understanding of Asterisk Gateway Interface (AGI) development and proper AGI development practices.

This article will present a simple VoIP solution using Asterisk, an open source private branch exchange (PBX) product. It will show you how to install Asterisk, configure it using its LDAP backend, and connect to it using the Ekiga software VoIP client and a Cisco 7900 Series VoIP telephone to make calls.

Building Telephony Systems with OpenSER is a new book from Packt, which acts as a step-by-step guide to building a high performance Telephony System. Written by Flavio E. Goncalves, this book teaches users how to develop a fast and flexible Session Initiation Protocol (SIP) server using OpenSER.

Voice Internet Protocol (VoIP) Telephony refers to the technology used for making telephone calls over the Internet. The two major technologies used to implement VoIP telephony are Asterisk and OpenSER. This article by Flavio E. Goncalves compares Asterisk and OpenSER topic by topic and shows the differences between them.

The VAR Guy has spent considerable time wondering if — or when — Cisco was going to meld its VoIP platforms with Asterisk, the open source IP telephony platform.

Even though a trixbox system is a phone system, it is still a basic computer system like any other. One of the problems that we face is that extensions and VoIP service providers typically come into the system over the open Internet; this means that certain aspects of our system are wide open to the outside world.

Companies selecting a VoIP solution must choose from a dizzying array of options, including whether a hosted, hybrid-hosted or premise-based telephony system will work better for them, and whether the benefits of open source outweigh the potential risks.

It’s one small step for Dell, and another great leap for Asterisk — the open source VoIP phone system. Dell plans to promote Fonality (a major Asterisk proponent) to small business customers seeking IP telephony systems. It’s a landmark development, folks, that benefits Dell in multiple markets (open source, VoIP, unified communications, and managed services). Here’s why.

The Android based, VoIP-capable Glass phone with a chip each for operating system and telephony plus an 8" touchscreen is supposed to welcome a new era in business telephony.