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多功能电话转移呼叫器用于同一外线上并接两部电话时可以相互转移呼叫,并可以在无电话打入时实现电话间互相呼叫通话,当外线受
Multi-function telephone transfer pagers can be used to transfer calls to and from each other when they are connected to the same external line and can call each other when no call is made. When the external call receiver