NF Z82-058-5*NF EN 300058-5:2001 综合业务数字网(ISDN)呼叫等待(CW)补充业务 数字用户信号系统第1号(DSS1)协议 第4部分:网络的试验组结构及试验目的规范
Integrated Services Digital Network (ISDN) - Call waiting (CW) supplementary service - Digital Subscriber Signalling system No one (DSS1) protocol - Part 5 : Test Suite Structure and Test Purpose (TSS and TP) specification for the network