DIN EN 300286-1:2000 综合业务数字网(ISDN).用户对用户信令(UUS)补充业务.数字用户用1号信令系统(DSS1)协议.第1部分:协议规范
Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300286-1 V 1.2.4 (1998-0