YDN 082-1998
宽带综合业数字网(B-ISDN)2号数字用户信令系统(DSS2)技术规范 用户接入呼叫控制部分(点到多点)(内部标准)
Broadband Integrated Industry Digital Network (B-ISDN) No. 2 Digital Subscriber Signaling System (DSS2) Technical Specification User Access Call Control Part (Point-to-Multipoint) (Internal Standard)