What companies offer an ATA VoIP system?

What companies offer an ATA VoIP system?

Jim Gurol (VP of Operations, Tierzero) gives expert video advice on: What is an ATA VoIP system?; Who can I call using the ATA VoIP system?; How does an ATA VoIP system work? and more...

Most ATA devices can be purchased from a computer store. I mean it's basically in a little box. Some of them actually come packaged with a voice over IP service provider. Or if you buy the ATA, you can choose the service provider by comparing their rates, and you can hook up this ATA device with that service provider.