摘要：本文探讨采用软交换技术进行PSTN网改的经济性分析的方法，并通过情景案例分析和深圳电信NGN网改的案例分析，得出采用NGN进行网改的运营商所需要关注的几个重点。
关键词：ngn pstn ims voip
单位：华为技术有限公司
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