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In the beginning, when the Internet Protocol was first designed, no one was thinking about the possibilities of sending audio and video. Real time communication was not an issue. Perhaps the greatest single problem is that the Internet Protocol (the IP part of VoIP - Voice over Internet Protocol) wasn't designed to ensure that the packets are delivered in the correct order. When information is transmitted using IP, the data is broken up into information packets, each of which is sent separately. The correct sequence of packets is part of the information in each packet, but nothing specifically exists to make sure that the packets are delivered, and, therefore, received in the proper order.
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