| 摘要 |
A system for screening telephone calls is provided. The system includes a ring detector that generates ring status data, such as a first data value when a ring signal is being received and a second data value when no ring signal has been received for a predetermined period of time. A message detector generates message status data, such as a first data value when an outgoing message end tone has been detected and a second data value when no outgoing message end tone has been detected for a predetermined period of time. A message screener is connected to the ring detector and the message detector and amplifies a message based on the ring status data and the message status data, such as when the ring status data and the message data indicate that an incoming message is being recorded.
|
