电话交换机是一种特殊用途的用户交换机。它有若干电话机共用外线，适用于机关、团体、中小企业等单位，也可以用于住宅和秘书电话。集团电话交换机不需要专职的话务员和维护人员，每部都可以通过指示灯了解整个系统的工作情况。当外线呼入时，可由任意一部话机应答，并可以转给所需的被叫。任何一部话机要呼外线时，只要按下代表空闲外线的相应键，即可拨号呼叫外线。
电话交换机的基本任务与结构-两化融合 关键词： 电话交换机；技术应用；任务结构 [gap=556]keywords:telephone exchange;technology application;task structure
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网络电话交换机 IP PBX
互联网电话交换机 ip pbx
自动电话交换机 automatic exchange ; [通信] automatic telephone switchboard ; dial exchange ; [通信] automatic telephone exchange
用户电话交换机 PBX Private Branch exchange ; private branch exchange ; CTX Customer Telephone eXchange ; CTX
程控电话交换机 Digital Telephone Switch Board ; NEC ; PCS----program control switches
专用自动电话交换机 [通信] private automatic branch exchange ; private automatic telephone exchange
共电式电话交换机 common battery private branch exchange ; common battery telephone exchange
市内电话交换机 local telephone switching system
数字电话交换机 Digital Telephone Exchange TXD
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SOCKS服务器类似于老式的电话交换机。
A SOCKS server is similar to an old-fashioned telephone switchboard.
它们最初于六十年代晚期在通讯中被用于控制机电电话交换机。
They were first used back in the late 1960s in communications to control electromechanical telephone switches.
如果没有事先录制好演示内容，我就得带上几台交换服务器和电话交换机了。
Had I not prerecorded my demos, I would have had to bring along a few Exchange Servers and a telephone switch.
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