[header] How to use voip [title] Figure out which of three categories of callers you fall into : [step] Ata, ip phones, and computer-to-computer. [title] Adapt with an ata or analog telephone adaptor. [step] This is the most common way of using voip. 
This adapter actually allows you to hook up the phone, which is already in your house, to your internet connection. What the ata does, is turn the normal analog signal that your average home phone sends into digital signals that can be sent over the internet.