Based on IP technology, VoIP is favored for its extremely low price, though it severely erodes the market shares on voice service of PSTN operators and mobile operator.
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释义
摘要基于IP技术发展而来的IP电话业务因资费低廉而深受人们青睐,但也对传统的固定电话、移动电话语音业务造成严重冲击。
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