Integrated Services Digital Network (ISDN); Terminal Portability (TP) supplementary service - Digital Subscriber Signalling System No. one (DSS1) protocol - Part 1: Protocol specification (Endorsement of the English version EN 300055-1 V 1.2.4 (1998-06) as German standard)
综合业务数字网(ISDN);终端便携性(TP)补充业务.数字用户信号发送系统第1号(DSS1)协议.第1部分:协议规范(作为德国标准认可英文版EN 300055-1 V 1.2.4(1998-06))