... ,Base Station,PBX,Wireless Exts Board. 2.4G Wireless PBX System is based on the digital PBX System, which consists of the following four ... parts:1) Wireless Exts board(2 Base Station,4 Base Station,8 Base Station)2) WS824 Digital PBX System(5D/10D/10D-A,option ... )3) Mobile phone of 2.4G Digital wireless key phone(Called ...