标准查询 标准查询公用交换电话网(PSTN).用户室内用多频按钮接收器(CEPT建议T/CS 34-09 E(1983))
Public Switched Telephone Network (PSTN); Multifrequency Push-Button Receiver at Subscriber's Premises; (CEPT Recommendation T/CS 34-09 E (1983))
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标准查询Public Switched Telephone Network (PSTN); Multifrequency Push-Button Receiver at Subscriber's Premises; (CEPT Recommendation T/CS 34-09 E (1983))
