ETSI EN 300 097-4-1998 综合业务数字网(ISDN).被叫线路识别表示(COLP)补充业务.1号数字用户信令系统(DSS1)协议.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); Connected Line Identification Presentation (COLP) Supplementary Service; Digital Subscriber Signalling System No. One (DSS1) Protocol; Part 4: Abstract Test Suite (ATS) and Partial Protocol Implementation eXtra