ETSI PRETS 300 976-1996 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5.?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) (GSM 09.07 Version 5.2