Graves On SOHO Technology

Selecting hardware appropriate for a particular Asterisk installation has been a topic of discussion ever since the emergence of Asterisk. This typically centers around choosing hardware to handle n users or x concurrent calls. Often the focus is on how to scale up to the greatest number of users for a given server. However, there can be different but related considerations as we consider ever smaller applications.

In various circles I’ve lately witnessed a minor spike in interest in small form factor Asterisk systems. I have found it curious to survey the various hardware platforms that people are considering when creating their own DIY Asterisk Appliances. To establish some perspective on this I recently posted my own history of using Asterisk my own little Asterisk retrospective.

There are quite a range of small computing platforms available to the enthusiast seeking to tinker with Asterisk. It seemed to me that an overview of such hardware and related resources would be helpful.

For my purposes I’ll only consider generic platforms suitable for a DIY project , not the commercially offered embedded Asterisk devices, of which there are many. These small host platforms tend to be in the $50-$300 range which makes them approachable for hobbyists, home users and some small businesses.

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I’ve recently been reflecting upon my history as an Asterisk user and the evolution of my preference for embedded systems (aka appliance) approach to Asterisk servers.

The path that I’ve followed is probably typical of a lot of people in many ways. Perhaps by sharing my experience I can help some people avoid some of the problems that I have faced, and understand how I arrived at my personal definition of an “Asterisk Appliance.”

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One project that I’m am about to start is moving from my m0n0wall router to a new one build around pfsense. The motivation for the project is the integration of our Comcast Business Class internet service into the rest of the household. At present there are two separate networks, with only a few devices enjoying the high speed cable service. The pfsense system will be configured for dual WAN, accessing both the cable service and Covad DSL circuit.

My existing m0n0wall runs on an old Soekris Net4801. In service for many years, it has been extremely reliable. If m0n0wall does what you need I have no hesitation in recommending the software. Support from the user community is tremendous as well.

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So Netgear has released an open source router. Thus it has something to compete with the open source version of the venerable Linksys WRT-54GL. Garrett Smith has an interesting viewpoint on this. One that I’m inclined to agree with.

I’m not a typical user. I’m an early adopter. I don’t mind putting in some effort to making something work up to its promised potential. I also like open source, but I just don’t see the value in running 3rd party software on a hobbled router platform. It’s just not good use of my time.

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After a relatively long quiet period the Astlinux mailing list has been fairly active lately. This is thanks in part to some new users who have been extending the distro to meet their needs. Like any open source project, the more the merrier, even if we sometimes bring differing visions to the party.

A new user I know only as FRED on the Astlinux mailing list has compiled a nice reference to building an embedded Astlinux server, including adding some nice things like Python and SQLite. Very handy. Worth a read.

Astlinux remains my favorite embedded distro, even though I’m still eagerly awaiting a release that includes Asterisk v1.4.

This article was originally published at www.smallnetbuilder.com.

Michael Graves
January 13, 2006

The Asterisk open source Voice over IP (VoIP) PBX is usually set up on a standalone PC. But Michael Graves shows how the combination of a special Asterisk distribution and a single board computer can provide a compact, quiet and low-power alternative.

Introduction

Astlinux is a bundled distribution of the Asterisk open source iPBX private branch exchange (PBX) software and a Linux operating system. Originally developed by Mark Spencer at Digium, Asterisk is the leading open source software in the telephony/VoIP space. Asterisk excels at combining traditional TDM telephony capability – provided through hardware from Digium and others – with VOIPservices. These include call routing, media gateway, media server and SIP signaling capabilities.

The Asterisk user community has been growing tremendously over the past two years, especially since the v1.0 release in the fall of 2004. With that growth has come the development of new distributions that bundle suites of software tools, to ease the setup and administration of a new Asterisk system. Asterisk@Home and Xorcom Rapid are both fine examples of this sort of activity.

Astlinux was developed by Kristian Kielhofner, and intended to go in a fundamentally different direction. Astlinux provides an Asterisk installation on a Linux distribution that has been built from scratch and optimized for small format hardware platforms – it takes what is essentially an embedded systems approach to Linux and Asterisk. In this article, I’ll show you how to build an VoIP PBX using Astlinux and a Soekris Net4801 single board computer (SBC).

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