DIN EN 300064-5:1999 综合业务数字网(ISDN).直接拨入(DDI)补充业务.数字用户用1号信令系统(DSS1)协议.第5部分:网络用试验组及试验目的规范
Integrated Services Digital Network (ISDN); Direct Dialling In (DDI) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endorsement