Private branch exchanges for connection to the British Telecommunications public switched telephone network. Facilities on private branch exchanges-Specification for facilities on private branch exchanges with terminating stations treated as an entirety
专用分支交换机 用于连接英国电信公共交换电话网 私人分支交易所的设施 具有作为整体处理的终端站的专用分支交换机上的设施规范

1993-02-15

Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators-Specification for private branch exchanges with terminating stations treated as an entirety
专用分支交换机 用于连接某些公共电信运营商运营的公共交换电话网络 终端站作为一个整体处理的专用分支交换机规范

1993-02-15

Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators-Specification for general requirements
专用分支交换机 用于连接某些公共电信运营商运营的公共交换电话网络 一般要求规范

1993-02-15

Private branch exchanges for connection to public switched telephone networks run by certain public telecommunication operators-Specification for the procedure for in-service observation of PBXs undergoing type approval
专用分支交换机 用于连接某些公共电信运营商运营的公共交换电话网络 正在进行型式认证的PBX在役观察程序规范

1990-10-28

Private branch exchanges for connection to public switched telephone networks run by certain public telecommunications operators. Simple call-routeing mode (SCRM)-Specification for the simple call-routeing mode of PBX operation, with terminating stations treated as an entirety
专用分支交换机 用于连接某些公共电信运营商运营的公共交换电话网络 简单呼叫路由模式（SCRM） PBX操作的简单呼叫路由模式规范 终端站作为一个整体处理

1993-02-15