In
telecommunication
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...
, a recorder warning tone is a tone transmitted over a
telephone line
A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. It is designed to reproduce speech of a quality that is understandable. It is the physical wire or ot ...
to indicate to the
called party that the
calling party is recording the conversation.
In the United States, 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 part of any recording device used for the purpose and is required to be not under the control of the calling party. The tone is recorded together with the conversation.
References
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External links
Recorder warning tonedefined in
Federal Standard 1037C
Recorder warning tonesuperseding the authority of Federal Standard 1037C, the
American National Standard T1.523-2001, Telecom Glossary 2000, published by ATIS.
Telephony signals
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