ETSI PRETS 300 141-5-1995 综合业务数字网(ISDN).呼叫保持(HOLD)补充业务.数字用户1号信令系统(DSS1)协议.第5部分:网络测试套件结构和测试目的(TSS&TP)规范
Integrated Services Digital Network (ISDN); Call Hold (HOLD) Supplementary Service; Digital Subscriber Signalling System No. One (DSS1) Protocol; Part 5: Test Suite Structure and Test Purposes (TSS&TP) Specification for the Network