ETSI ETS 300 185-1-1993 综合业务数字网(ISDN).会议呼叫,追加(CONF)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(包括勘误表-1995和修改件1)?
Integrated Services Digital Network (ISDN); Conference Call, Add-on (CONF) Supplementary Service Digital Subscriber Signalling System No. One (DSS1) Protocol Part 1: Protocol Specification Includes Corrigendum - 1995 and Amendment 1