Sure, small businesses are moving to VoIP phone systems. Now for the challenge: Which partners should you dial for help? The list of options grows by the day.

There are Asterisk-based open source solutions such as Digium, Fonality and SwitchVox; traditional players such as Cisco, 3Com and Nortel; and startups like TalkSwitch to consider. Even Intel wants a piece of the action, and is pumping investment money into Fonality.

Which vendors should you speed-dial? To get some clarity on the market, check out VoiceCon Spring (March 5-8, Orlando) or VON (March 19-22, San Jose).