ETSI TS 101 739-1999 Digital Cellular Telecommunications System (Phase 2+) Call Deflection (CD) Supplementary Service Stage 2《数字蜂窝通信系统(第2+阶段) 呼叫改发(CD)补充业务 第2阶段GSM 03 72(版本7 0 1 199.pdf

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