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IP Telephony, also called 'Internet telephony', is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines.
It is the practice of using an Internet connection to pass voice data using IP instead of using the standard public switched telephone network (PSTN). This can avoid long distance telephone charges and, in many cases, it can completely avoid all call charges, as the only connection is through the Internet.
VOIP is the two-way transmission of phone conversations over an IP network, allowing audio to travel over the Internet, intranets, or private LANs (local area networks) and WANs (wide area networks). Users at both locations must have identical or compatible software or hardware. Calls may be made from PC-to-PC, PC-to-phone, or phone-to-phone, using an Internet telephony service provider (ITSP). VOIP is popular for inexpensive or free local, national or international calls.
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