In telecommunication, a recorder warning tone is a tone transmitted over a telephone line to indicate to the called party that the calling party is recording the conversation. In the US, the recorder warning tone is a half-second burst of 1400 Hz applied every 15 seconds. The recorder warning tone is required by law to be generated as an integral ...
Found on
http://en.wikipedia.org/wiki/Recorder_warning_tone
[US] Credit: K.P. Sowerby, June 2002 ...
Found on
http://en.wikipedia.org/wiki/Recorder_warning_tone_(US)
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