I found a great post from Tom Keating about Asterisk Termination and ENUM, which discusses the [lack of] progress in the potentially lucrative market of Peer-to-Peer Enterprise Telephony.
From the article:

Of course, the Asterisk system uses its proprietary IAX protocol for inter-Asterisk communication and not standard SIP, so unless IAX is supported by all IP-PBXs (not […]

The Asterisk.org Development team has just announced the latest Asterisk Release Schedule. This should provide the initial motivation to start the process of upgrading your Asterisk PBX system.
However, in my experience migrating from Asterisk v1.2 to v1.4 does present itself with a few challenges.
For example, the CLI commands that were deprecated are now […]

In my last How To Configure Asterisk Article, I showed you how to setup and deploy a basic Asterisk PBX system. In this article, I will demonstrate the power of using Macros in your dial plan.
Macros assist you by significantly reducing the amount of code in your dialplan. Once you define a Macro, they […]

OpenSER is a flexible, mature and stable SIP communications server. However unlike Asterisk, OpenSER requires extensive knowledge of the SIP Protocol and presumes nothing about your configuration or method of deployment.
I am basing this configuration on OpenSER v1.1.1 which is currently considered the most ’stable’ version. Although v1.2 has been released, I am going […]

Deploying your first Asterisk system can be a frustrating task, espcially if you attempt to utilize the more advanced features and functions of Asterisk without having a solid foundation of the basic concepts. This article will walk you through the process of downloading, compiling and configuring your first instance of Asterisk that will allow […]

On Feb 22nd, 2007 subscribers of the OpenSER users mailing list were informed that a SER/OpenSER Configuration generator is now available.
This is an excellent tool for those looking to quickly configure OpenSER v1.1.1 for their own VoIP Services. Currently his configuration generator supports basic routing, far-end NAT traversal using either rtpproxy or mediaproxy and […]