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赵艳琼
VoIP is a technology which can provide voice communication and other services using Internet Protocol. It becomes especially attractive for giving low-cost voice transmission in public network and providing voice, fax, video, and data communication services at the same time. VoIP technology will change traditional communication method. Voice over IP has now been proven feasible. Needless to say, the technical difficulties of transporting voice and commericial implementation are challenges many c
