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	Issue TOC Print full article Print this page Download as PDF E-Mail this URL Discuss this article Flame the author     In this article Introduction Purchace Process Web Links Interactive Buyer's Guide IP PBX Chart Customize Chart Product Directory Search

We wouldn't recommend ordering a PBX based solely on our Buyer's Guide charts. You should get a detailed quote and make sure the PBX has all the features you need to support your business and end users. Of course, pricing will vary based on your needs.

Security is also an important consideration. Using a VPN is a common way to ensure that communications going across the Internet are encrypted. When you combine a VPN with IP codecs, it starts to add milliseconds of latency. When this gets into the triple digits, it can seriously impact your call quality. Before you sign on the dotted line, verify that you can put your IP phones and the IP PBX behind a firewall (see "Hold the IP Phone").

Peruse our online survey results. Choose the vendor whose offering most closely matches your price range and requirements. Then issue an RFI (Request for Information) or an RFP (Request for Proposal) and send it to your local resellers. These companies usually sell and install the IP PBXs.

Be sure to account for the cost of maintenance and configuration changes such as adding new external trunks. And beware of long-term relationships and costly after-sales support. Technology is becoming more standards-based. If your requirements change, you will want some flexibility. If you find this to be a bit overwhelming and your budget permits, a consultant can save you time and money by keeping the resellers honest and helping to negotiate the best deal for you.