The Intelligent Network concept has its roots in the first software-controlled switches in the 1970s.

智能网的概念起源于1970年代的第一批软件控制交换机。

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The Intelligent Network concept has its roots in the first software-controlled switches in the 1970s.

智能网的概念起源于1970年代的第一批软件控制交换机。

youdao