ETSI GSM 09.03-1996 数字蜂窝通信系统.综合业务数字网(ISDN)或公共交换电话网(PSTN)与公共陆地移动网(PLMN)互通的信令要求.GSM 09.03(版本5.0.0)
Digital Cellular Telecommunications System; Signalling Requirements on Interworking between the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) and the Public Land Mobile Network (PLMN)