ETSI ETS 300 604-1999 数字蜂窝通信系统(第2代);公共陆地移动网(PLMN)和综合业务数字网(ISDN)或公共交换电话网(PSTN)互通的一般要求第7版;GSM0
Digital Cellular Telecommunications System (Phase 2); General Requirements on Interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (Seventh Edition; GSM 0