| 摘要 |
The inventive control mechanisms are useful in a answering device in which previously recorded incoming messages can be played out via the telephone line under remote control. Remote playout is initiated upon receipt of a first beep tone transmitted by the user. Remote playout is terminated by receipt at a second such beep tone. In the event that the second beep tone is not received, a fail-safe mechanism, disclosed herein, modifies the ring response time of the ring detector so that a large number of rings, typically 20 to 25, are required to effectuate automatic answering. The average caller will hang up before this occurs. The user however, recognizing the situation, can allow the phone to ring enough times so that the device will answer, thereby enabling the user remotely to cause rewinding of the message tape and resetting of the device into the mode in which succeeding calls will be answered normally.
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