Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network
综合业务数字网(ISDN);呼叫保持补充业务;数字用户信令系统第一号(DSS1)协议;第6部分:网络抽象测试套件(ATS)和部分协议执行额外测试信息(PIXIT)形式规范