Windows XP Home Edition Product Documentation

Phone Dialer allows you to make voice calls, video calls, and conference video calls from your personal computer.

To make a voice call, all you need is the recipient's phone number, IP address, or DNS (Domain Name System) name. Phone Dialer lets you make calls with a telephone connected to your computer, through a modem, over a network, through a telephone switch connected to your local area network (LAN), or an Internet address.