VoIP,based on IP protocol,is a voice transport technology.It has developed rapidly with the development of Internet.In 1995,Isreal’s Vocal Tec company produced the InternetPhone,and after 10 years development,VoIP technology has made great progresses.As a new kind of voice communication technology,VoIP has impacted domestic traditional telecom operators extremely because of it’s low costs and low prices,and in
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