NF Z82-188-3*NF EN 300188-3:2001 综合业务数字网(ISDN)三方通话(3PTY)补充业务 数字用户信令系统No 1(DSS1)协议 第3部分:用户用测试套结构和测试(TSS&TP)规范
Integrated Services Digital Network (ISDN) - Three Party (3PTY) supplementary service - Digital Subscriber Signalling System No one (DSS1) protocol - Part 3 : Test Suite Structure and Test Purposes (TSS&TP) specification for the user