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device for the connection of a third subscriber, foretredesvis an operator, to an already connected forbindelse between two subscribers
device for the connection of a third subscriber, foretredesvis an operator, to an already connected forbindelse between two subscribers
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机译:用于将第三个用户(运营商)连接到两个用户之间已连接的forbindelse的设备
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摘要
Electronic time switching telephone system so that the operator can listen in, with the ability to break-in and talk to the correspondents connected to the corresponding exchange, the system comprises an interface modem between the operator's line transformer and the connection network.
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