DIN EN 300185-5:2000
综合业务数字网(ISDN).会议呼叫加入(CONF)补充业务.数字用户用1号信令系统(DSS1)协议.第5部分:网络用试验组结构和试验目的(TSS&TP)规范
Integrated Services Digital Network (ISDN) - Conference call, add-on (CONF) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network (Endors