标准查询 标准查询公用交换电话网(PSTN).信令系统R2.简化测试设备的使用(CEPT建议T/CS 54-02 E(1983))
Public Switched Telephone Network (PSTN); Signalling System R2; Use of Simplified Test Equipment (CEPT Recommendation T/CS 54-02 E (1983))
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标准查询Public Switched Telephone Network (PSTN); Signalling System R2; Use of Simplified Test Equipment (CEPT Recommendation T/CS 54-02 E (1983))
