ETSI EG 201 022-1998 宽带综合业务数字网(B-ISDN).2号数字用户信令系统(DSS2)协议.点对多点呼叫/承载信道控制的B-ISDN用户网络接口第3层规范.业务描述语言(SDL)确认
Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling No. Two (DSS2) Protocol; B-ISDN User-Network Interface Layer 3 Specification for Point-to Multipoint Call/Bearer Control; Service Description Language (SDL) Validation M