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结合黑龙江省实际情况阐述了交换网的演进路径,从PSTN到软交换,再到IMS,对每个时期的网络结构、特点进行了描述。
Combined with the actual situation in Heilongjiang Province, the evolution path of switching network is elaborated. From PSTN to softswitch to IMS, the network structure and characteristics of each period are described.