ETSI EN 300 899-4-2002 综合业务数字网(ISDN).7号信令系统.ISDN用户部分(ISUP)(版本2)和1号数字用户信令系统(DSS1)的互通.第4部分:抽象测试套件(ATS)和部分协议额外测试信息实现(PIXIT)形式规范
Integrated Services Digital Network (ISDN); Signalling System No.7; Interworking between ISDN User Part (ISUP) Version 2 and Digital Subscriber Signalling System No.One (DSS1); Part 4: Abstract Test Suite (ATS) and Partial Protocol Implementation eXtra In