SIP of Asterisk

Ever wondered how difficult it is to setup a PBX (Private Branch Exchange)? In my book it's a monumental task. I have setup a couple of these machines in my time, and my time for PBX configuration is over. There are many pitfalls in setting up one of these servers. Not the least of which is available information on which hardware (other than the higher end models) that will work to cobble together even a rudimentary build. Other considerations complicating the task are decisions about the type and reliability of the service carrier, the number of lines, voicemail accounts, automated answering, and data backup.

There is plenty of older hardware that will work with Asterisk, but you must rely on the trial and error method of finding it. The place to start with older (or cheap) hardware, is finding a modem with voicemail capability and a motorola chipset. If you are unsure, google the chipset plus "asterisk" and begin there. Stay away from "unlocked" hardware from other providers. They are a pain as well. In my experience Digium hardware and Cisco phones are the only way to fly.

Backup, make notes, and research. Configuring a PBX is no simple task. There many variables that need to be set, and many more that can effect other parts of the system. If you reach a point where something is working the way it should, back up the system. Make notes of configuration changes, and research configuration options when unsure. Sometimes reading other people's issues and solutions can help down the road.

Choosing a carrier isn't easy. There are many good companies that offer reliable SIP/IAX service or interface with traditional POTS (phone company) line. They all offer competitive rates, but some are better at customer service than others. You want to avoid startups. Go with a company who has been around the block. This will save you headaches down the road.

Configuring voicemail, automated answering, caller ID, and more advanced features aren't simple tasks. I remember voicemail being a particular nuisance. The first (or even the second and third) build are a labor of love and learning.

Backing up all of the data stored on your newly employed PBX is an important consideration as well. Voice messages require more space than text files, email volume can be taxing on a backup system, and you may want to keep a running list of incoming calls. Simple configuration changes can effect data adversely, so backup is extremely important.

Want to know more? Google "configuring asterisk". There are plenty of sites with good information on specific hardware and configurations. My last build was 3 years ago, and I will never forget (or replicate) it.