Chapter 6. Preparing Your Network for VoIP

This chapter presents a testing regime that you can use to prequalify your LAN for VoIP traffic, as well as solid background on the telecom features for which VoIP isn't natively designed.


Chapter 5 covers the design and management techniques of most networks and defines some of the helpful tools and system limitations that can affect a LAN. You can use the information in that chapter as a solid base to define your LAN's overall environment. This chapter builds on that information by applying it directly to your LAN.

Industry estimates identify a 50-percent chance of a failed VoIP deployment if you don't go through the prequalification phase. Out of all the successfully deployed VoIP networks that ignored pretesting, 60 percent report monthly service disruptions, and nearly two-thirds of those disruptions impact the businesses financially. The information in this chapter gives you the edge to prevent becoming a part of those statistics.

Determining Your Peak Call Volume

Because of the dynamic nature of VoIP, you have to analyze your traffic much more than if you were ordering traditional telephony lines. The non-VoIP world is very logical: Your local phone carrier drops off ten phone lines to your office, and you can then place ten calls at the same time — one per line. This setup makes life easy for the phone company because it knows up front how many calls you can possibly make, and the one-to-one ratio keeps everything neat and tidy. ...

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