ETSI TS 100 519-1999 Digital Cellular Telecommunications System (Phase 2+) Advice of Charge (AoC) Supplementary Services - Stage 1《数字蜂窝通信系统(第2+阶段) 收费通知(AoC)补充业务 第1阶段GSM 02 86(版本7 0.pdf

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