标准查询 标准查询公用交换电话网(PSTN).按钮多频信令自动发报机(CEPT建议T/CS 34-08 E(1985))
Public Switched Telephone Network (PSTN); Automatic Sender for Push-Button Multifrequency Signalling; (CEPT Recommendation T/CS 34-08 E (1985))
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标准查询Public Switched Telephone Network (PSTN); Automatic Sender for Push-Button Multifrequency Signalling; (CEPT Recommendation T/CS 34-08 E (1985))
