标准查询 标准查询公用交换电话网(PSTN).登记重呼(CEPT建议T/CS 20-09 E(1980))
Public Switched Telephone Network (PSTN); Register-Recall; (CEPT Recommendation T/CS 20-09 E (1980))
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标准查询Public Switched Telephone Network (PSTN); Register-Recall; (CEPT Recommendation T/CS 20-09 E (1980))
