ETSI EN 300 359-3-2001 综合业务数字网(ISDN).忙时用户呼叫接通(CCBS)补充业务.1号数字用户信令系统(DSS1)协议.第3部分:用户用测试套件结构和测试目的(TSS&TP)规范
Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) Supplementary Service; Digital Subscriber Signalling System No. One (DSS1) Protocol; Part 3: Test Suite Structure and Test Purposes (TSS&TP) Specification for the Us