英语词汇“central office exchange service”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	central office exchange service
释义	Central office exchange service Central office exchange service (communications)(Centrex) A PBX service providingswitching at the central office instead of at the companypremises. Typically, the telephone company owns and managesall the communications equipment necessary to implement thePBX and then sells various services to the company. See CENTREX See CENTREX
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Central office exchange service