Take a phone conversation (Voice), turn the sound into digital data, put the address of the other end of the conversation on the data, and send it out over the internet along with all the other data (Over Internet Protocol). The data finds it’s way to the other end, gets turned back into sound, and becomes the other end of the conversation. The principle is simple, the more difficult part is in the digitizing standards for compatibility, address assignment, routing, error recovery, etc.
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RingUK 