ETSI PRETS 300 500-1995 欧洲数字蜂窝通信系统(第2阶段).GSM公共陆地移动网(PLMN)支持的电信业务原理.GSM 02.01(版本4.6.0.第2版)
European Digital Cellular Telecommunications System (Phase 2); Principles of Telecommunication Services Supported by a GSM Public Land Mobile Network (PLMN) (GSM 02.01 Version 4.6.0) Second Edition