ETSI ETS 300 356-33-1997 综合业务数字网(ISDN).7号信令系统.用于国际接口的综合业务数字网用户部分(ISUP).第2版.第33部分:网络层抽象测试套件(ATS)和部分协议额外测试信息实现(PIXIT)的形式规范
Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) Version 2 for the International Interface; Part 33: Abstract Test Suite (ATS) and Partial Protocol Implementation eXtra Information for Testing (PIXIT) Proforma Spec