Providers like Vonage and AT&T Call Vantage are bundling ATAs free with their service.
What is the easiest way to use VoIP?
What is the interesting thing about VoIP?
What can VoIP do to a standard Internet connection?
There are several companies offering free or very low-cost software that you can use for this type of VoIP.
Wi-Fi phones allow subscribing callers to make VoIP calls only from home PC's.
The ATA allows you to connect a standard phone to your computer or your Internet connection for use with VoIP.
VoIP can turn a standard Internet connection into a way to place free phone calls.