ETSI TS 100 625-1999 Digital Cellular Telecommunications System (Phase 2+) Unstructured Supplementary Service Data (USSD) - Stage 1《数字蜂窝通信系统(第2+阶段) 非结构化补充业务数据(USSD) 第1阶段GSM 02 90(版_1.pdf

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