Integrated Services Digital Network (ISDN) - Signalling System No. 7; Transaction Capabilities (TC); Application Service Element (ASE) for Message Waiting Indication (MWI) supplementary service - Part 1: Protocol specification; English version ETS 300754-1:1997
综合业务数字网(ISDN)-第7号信令系统;交易能力(TC);消息等待指示(MWI)补充业务用应用服务元件(ASE).第1部分:协议规范;英文版ETS 300754-1:1997