DIN ETS 300668-2:1997 宽带综合服务数字网络(B-ISDN).2号数字用户信令系统(DSS2)协议.用户对用户信令补充服务.第2部分:协议实施声明(PICS)格式规范
Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling System No. two (DSS2) protocol; User-to-User Signalling (UUS) supplementary service - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specificatio