This guide will explain some ways to set up a VoIP ATA so that you can place calls between computers with modems (although any other pair of telephone devices will work.) When done, you will be able to:

• Connect two or more computers with modems directly together using a single ATA
• Connect a computer with a modem to another computer and modem elsewhere in your house over your LAN using two ATAs
• Connect a computer with a modem to another one in someone else's house over the internet

Note that this does NOT involve setting up Asterisk!