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Voice over IP (VoIP) is a methodology and group of technologies for 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, broadband telephony, and broadband phone service.oIP systems employ session control and signaling protocols to control the signaling, set-up, and tear-down of calls. They transport audio streams over IP networks using special media delivery protocols that encode voice, audio, video with audio codecs, and video codecs as Digital audio by streaming media.
The IP phone always keeps its number, and behaves exactly the same way, no matter where you plug it in â on your desk, in the office next door or on a tropical island. All of this works because of the SIP protocol. It is a standard widely used by ISPs, VoIP phone systems and VoIP phones world-wide.