Recent video business has a good development trend, for the most part is IP business, it can be seen that the current business of telecommunication network in addition to the traditional telephone business is IP business, to 70% of the long distance telephone and telephone service is IP telephone, broadband networks, IP become the inevitable trend of the entire telecommunication network development, in the foreseeable future, IP phone will gradually replace the traditional phone and eventually complete IP, development and improvement of VoIP technology to fully replace PSTN becomes a research focus in the current,
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