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VoIP is taking the Internet world by storm. VoIP or Voice over Internet Protocol is the technology of taking audio and transmitting it as data over the Internet. Traditional phone lines use Circuit Switching (think of the switchboard operators), which is an electric current. VoIP uses Packet Switching that converts audio into data packets and transfers them over the Internet. VoIP is the technology used behind combining Instant Messaging and voice. Many companies are now incorporating free VoIP with their Instant Messaging programs. All that is required is that both parties (or more than two) are using the same program. For instance, the new Yahoo Messenger (actually called Yahoo Messenger with Voice) will let you call your buddies.
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