ETSI TS 101 108-2001 Digital Cellular Telecommunications System (Phase 2+) Tandem Free Operation (TFO) Service Description Stage 1《数字蜂窝通信系统(第2+阶段) 无顺序操作(TFO) 业务描述 第1阶段GSM 02 53(版本8_1.pdf

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