How IP Telephony Works
If you regularly make long-distance phone
calls, chances are you've already used IP
telephony without even knowing it. IP telephony,
known in the industry as Voice-over IP (VoIP), is
the transmission of telephone calls over a data
network like one of the many networks that make
up the Internet. While you probably have heard of
VoIP, what you may not know is that many
traditional telephone companies are already using
it in the connections between their regional
offices. In this article, you'll learn about VoIP
and the technology that makes it possible. We'll
talk about VoIP's major protocols, about the
various services provided and the low-cost, often
free software that allows you to take advantage
of them.
http://computer.howstuffworks.com/ip-telephony.htm
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