VOIP is destined to be the "way of the future" for telephone communications. With the catchy Vonage commercials, rapid growth of Skype, cable companies pushing "digital phone", and business phone vendors pushing this latest technology we've probably all heard of VOIP.
The following links are interesting articles on VOIP technology, what it is, and the pros and cons. Pay particular attention to the cons as much of it is related to security risks. In the legal profession the standard of care taken to protect privacy is higher than in a residential setting.
What is VOIP?
Security on VOIP
Why VOIP Needs Crypto :: Wired Magazine
A Pretty Good Way to Foil the NSA :: Wired Magazine
Buying VOIP Service