A telephone, such as a mobile phone, places a telephone call to another telephone by transmitting a signal (e.g., digital or analog) indicative of a sound wave. The signal indicative of the sound wave encodes sound data over a voice channel. The sound data includes human audible data, such as data indicative of sounds (e.g., voice) captured by a microphone. That is, the frequency of the sound wave that encodes the human audible data is within a frequency range audible by humans. The sound data also includes human inaudible data, such as a telephone number of the calling device, an image of the caller, a location of the calling device, associated with the calling telephone or a user of the calling telephone. That is, the frequency of the sound wave that encodes the human inaudible data is above the frequency range audible by humans. When the recipient telephone receives the signal indicative of the sound data, the recipient telephone converts the signal to a human audible sound wave that encodes the human audible data. The recipient telephone may utilize the human inaudible data to enhance the functionality of the call. For example, the recipient telephone may display the human inaudible data (e.g., a phone number of the calling device and/or an image of the caller) or connect a video call via URL encoded in the human inaudible data.
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Segel-Brown, Asher; Zinke-Allmang, Stefan; and Segel, Honna, "ENHANCED TELEPHONY USING HUMAN INAUDIBLE DATA OVER VOICE CHANNEL", Technical Disclosure Commons, (November 05, 2019)