ETSI ETS 300 604-1997 欧洲数字蜂窝通信系统(第2阶段).公共陆地移动网(PLMN)和综合业务数字网(ISDN)/公用交换电话网(PSTN)之间互通的一般要求.GSM 09.07(第6版)
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)