Access and Terminals (AT); Harmonized basic attachment requirements for Terminals for connection to analogue interfaces of the Telephone Networks; Update of the technical contents of TBR 021, EN 301 437, TBR 015, TBR 017; Part 3: Basic Interworking with the Public Telephone Networks
接入和终端(AT);电话网络模拟接口连接终端的协调基本附件要求;更新TBR 021、EN 301 437、TBR 015、TBR 017的技术内容;第3部分:与公共电话网的基本互通