One of the first open source VoIP projects — and one of the earliest VoIP PBXes, period — is Digium-sponsored Asterisk. A highly mature platform licensed under the GPL, Asterisk supports almost ...

Whereas commercial VoIP vendors typically supply their own phones, tying them to their IP PBXes for solid integration and providing phone setup, configuration, and maintenance as part of their ...

Here's a very cool thing: Eastern Management Group is conducting a survey to try and size the market for Open Source IP-PBXs. As far as I can tell, no such quantification exists for this market, so it ...