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How DTMF WorksĭTMF uses two sine waves, one low frequency and one high frequency, to create a unique tone. DTMF is a widely used signaling system that is used in a variety of applications such as telephone banking, automated customer service systems, and remote control systems. This tone is then used to indicate which number or symbol has been selected by the user. DTMF is a combination of two sine waves, one low frequency and one high frequency, which together create a unique tone. It is also known as Touch-Tone, and is used for the input of numbers and symbols in the telephone system. Definition of Dual Tone Multi-Frequency (DTMF)ĭual Tone Multi-Frequency (DTMF) is an audio signaling system used in telephone networks. If you are the only participant on an AT&T conferencing bridge, *#903# will mute the hold music.Dual Tone Multi-Frequency (DTMF) is an audio signaling system used in telephone networks. Note: This command does not apply to Call Queues.  When calling an extension, press the # key to go directly to the extension’s voicemail.  This will transfer the call externally showing the caller ID of the extension transferring, not the original caller’s ID. This will transfer the call externally showing the original caller’s ID, not the extension transferring it. See Call Commands – Using # for transferring calls for more information. See Call Park Touch Tone Commands for more information. See On-Demand Call Recording for more information. You may use these * and # codes / touch tone commands / shortcuts on any AT&T provisioned desk phone with AT&T Wireless & Wireless Integrated for AT&T FUNCTIONĭuring an active call, press *1 up to 8, to initiate Call Flip.ĭuring an active call, press *9 to start/end the call recording. This article shows the list codes and shortcuts that you can use on your AT&T Wireless & Wireless Integrated for AT&T phones to perform certain functions such as transferring calls, call recording, etc. AT&T Wireless & Wireless Integrated for AT&T Dual Tone Multi Frequency (DTMF) Codes and Commands

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