DIN EN 300195-1-2002 综合业务数字网(ISDN).补充业务相互作用.数字用户信号传输系统1号(DSS1)协议.补充服务互连.第1部分:协议规范 (英文版本核准本 EN 300195-1 V 3.1.1 (2002-04) 作为德国标准)
Integrated Services Digital Network (ISDN) - Digital Subscriber Signalling System No. one (DSS1) protocol; Supplementary service interactions - Part 1: Protocol specification (Endorsement of the English version EN 300195-1 V 3.1.1 (2002-04) as German Stan