美利体育登录入口官网:LST EN 301 657 V1.2.1-2004
专用综合服务网络(PISN);规范、功能模型和信息流;私人用户移动性(PUM);呼叫处理附加网络功能(ANF)[ISO/IEC 17877(2000),已修改]
Private Integrated Services Network (PISN); Specification, functional model and information flows; Private User Mobility (PUM); Call handling Additional Network Features (ANFs) [ISO/IEC 17877 (2000), modified]