ETSI TS 100 549-1999 Digital Cellular Telecommunications System (Phase 2+) Unstructured Supplementary Service Data (USSD) - Stage 2《数字蜂窝通信系统(第2+阶段) 非结构化补充业务数据(USSD) 第2阶段GSM 03 90(版_1.pdf

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