KS X ISO/IEC ISP 12067-3-2004(2009) 信息技术中继连接方式网络业务的国际标准化轮廓第3部分:PSDN子网相关媒体通过永久访问的虚拟呼叫相关要求
Information technology-International Standardized Profile RBRelaying the connection-mode Network Service-Part 3:PSDN Subnetwork-dependent media-dependent requirements for virtual calls over a permanen