Free calls over the Internet. Skype and not only

A familiar situation - your friends live in another country, thousands of kilometers from you? Or did you go to work far from home? Or the easiest option - you relax in an exotic resort. In all these cases, the desire to talk with friends and relatives looks quite natural, but you will certainly stop the high cost of conversations.
But we live in the XXI century! Modern technologies allow you to communicate with a person who is at any point on the planet, almost for a penny, and even at all for free. The name of these technologies is IP telephony. It is about her that is told in this book. The popular Skype program and other applications, hardware - about all these voice communication products, allow you to save on expensive long-distance and international telephone conversations, you will learn from this publication