Apparatus with one or more particular functions for connection to public switched telephone networks run by certain public telecommunications operators-Specification for apparatus with call barring facilities
具有一个或多个特定功能的设备 用于连接某些公共电信运营商运营的公共交换电话网络 带呼叫限制设施的设备规范
Requirements for apparatus incorporating facilities for barring certain outgoing calls or classes of outgoing calls to a PSTN. To be read in conjunction with BS 6789-1Cross References:BS 4778:Part 2BS 6305BS 6312BS 6317BS 6540:Part 4BS 6789:Part 1BS 6789:Section 3.1BS 6789:Section 6.1BT Specification D1804DTelecommunications Act 1984