ETSI TS 101 625-1999 Digital Cellular Telecommunications System (Phase 2+) High Speed Circuit Switched Data (HSCSD) Stage 1《数字蜂窝通信系统(第2+阶段) 高速电路交换数据(HSCSD) 第1阶段GSM 02 34(版本7 0 0 19.pdf

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