central telephone bureau
central telephone exchange
class (telephone) office
International Telephone Office
office telephone switching
ADSL transceiver unit-central office end
air conditioner specialized for central office
automatic central office
central office
中央电话局
中心局
中心站
总局
中央局
局
电话总局
电话总机
电信局
交换局干线
central office exchange
central office exchange service
central office interconnection
Central Office Switches
central office terminating cable