ETSI EN 300 188-1-1998 综合业务数字网(ISDN).三方(3PTY)补充业务.1号数字用户信令系统(DSS1)协议.第1部分:协议规范(版本1.2.4)
Integrated Services Digital Network (ISDN); Three Party (3PTY) Supplementary Service; Digital Subscriber Signalling System No.One (DSS1) Protocol; Part 1: Protocol Specification (V1.2.4)