station to station calling-operator assistance的意思|示意

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站对站呼叫接线员协助


station to station calling-operator assistance的网络常见释义

分机间呼叫–话务员协助 ... station to station calling(分机间呼叫) station to station calling-operator assistance(分机间呼叫–话务员协助) step call(步进呼叫) ...