Integrated Services Digital Network (ISDN); Call Hold (HOLD) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification
综合业务数字网(ISDN);呼叫保持补充业务;数字用户信令系统第一号(DSS1)协议;第1部分:协议规范
发布日期:
1992-05-01
ISDN用户网络第3层补充业务信令协议
ISDN User-Network Layer 3 Signalling Protocols for Supplementary Services