ETSI GSM 02 02-1995 Digital Cellular System (Phase 2+) Bearer Services (BS) Supported by a GSM Public Land Mobile Network (PLMN) (GSM 02 02)《数字蜂窝通信系统(第2+阶段) GSM公共陆地移动网(PLMN)支持的承载业务_1.pdf

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