Voice over IP (VoIP) commonly refers to the communication protocols, technologies, methodologies, and transmission techniques involved in the delivery of voice
communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet
telephony, voice over broadband (VoBB), broadband telephony, and broadband phone.
http://en.wikipedia.org/wiki/Voice_over_IP
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