每部电话都装配有回叫设备。

Every telephone was installed a callback facility.

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在回叫时远程站点上检测到了声音。

Voice detected at remote site on callback.

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北美用户访问自动电话回叫的常用代码。

Usual code in North America to access Automatic Callback.

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北美用户访问自动电话回叫的常用代码。

Usual code in North America to access Automatic Callback.

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