Method and apparatus for sending a data message to a selected station during a silent interval between ringing
作者： Carolyn Ann Doughty
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摘要: For use with a telephone switching system (100) serving plurality of stations and having central processor (108) for generating data messages ringing circuit (1601-1602) signals to selected station, method apparatus are disclosed sending message station (101) during silent interval between signals. The includes detector (501) sender (520). Responsive first signal, the generates status signal representative During interval, sends frequency shift keyed (1604) message.
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