| 摘要 |
For use with a telephone switching system serving a plurality of stations and having a central processor for generating data messages and a ringing circuit for generating ringing signals to a selected station, method and apparatus are disclosed for sending a data message to a selected station during a silent interval between ringing signals. The apparatus includes a detector and a sender. Responsive to a first ringing signal, the detector generates a status signal representative of the silent interval between ringing signals. During the silent interval, the sender sends to the selected station a frequency shift keyed signal representative of the data message.
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