DIN EN 301491-2-2002 专用综合业务网(PISN).相互交换信号传输协议.呼叫提供补充服务.第2部分:抽象试验序列(ATS)和部分测试用协议执行的附加信息(PIXIT)形式规范 (英文版本核准本 EN 301491-2 V 1.2.1 (2002-01) 作为德国标准)
Private Integrated Services Network (PISN) - Inter-exchange signalling protocol; Call offer supplementary service - Part 2: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification (Endorse