We’ve spent quite a bit of time reading and learning about Virtual Phone Systems, also known as Virtual PBX’s or Hosted PBX’s, so we thought that it would be helpful if we createed a list of additional articles, guides, and pages we found particularly helpful.

• VirtualPBX’s on Wikipedia – A quick definition of a VirtualPBX, Pro’s and Con’s, and common configuration.
• Hosted PBX’s on Wikipedia – Another quick definition with common features listed.