ETSI EN 300 185-4-2000 综合业务数字网(ISDN).会议呼叫,追加(CONF)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); Conference Call, Add-on (CONF) Supplementary Service; Digital Subscriber Signalling System No. One (DSS1) Protocol; Part 4: Abstract Test Suite (ATS) and Partial Protocol Implementation eXtra Information for Tes