DIN EN 300286-2:2000
综合业务数字网(ISDN).用户对用户信令(UUS)补充业务.数字用户用1号信令系统(DSS1)协议.第2部分:协议实现一致性声明(PICS)形式规范
Integrated Services Digital Network (ISDN) - User-to-User Signalling (UUS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol - Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification (Endorseme