ETSI GSM 09.06-1996 数字蜂窝通信系统(第2+阶段).用于支持分组交换数据传输业务的公共陆地移动网(PLMN)与分组交换公用数据网/综合业务数字网(PSPDN/ISDN)间的互通
Digital Cellular Telecommunications System (Phase 2+); Interworking between a Public Land Mobile Network (PLMN) and a Packet Switched Public Data Network/Integrated Services Digital Network (PSPDN/ISDN) for the Support of Packet Switched Data Transmission