![]() ![]() ![]() VoIP phones are designed to carry voice only, but can send DTMF as a data packet over the internet. Over regular phone lines, DTMF is sent as audio. The sound is interpreted on the receiving end and can be used to remotely control or interact with devices such as computers (through an IVR system) or answering machines. ![]() These DTMF sounds are used primarily by the military and within telephone networks.ĭTMF can be sent over phones lines, over the internet, or through two-way radios. This column’s keys are labeled A, B, C, and D. Though rarely seen on a phone, there is actually a fourth high-frequency tone that defines a fourth column to the right of the 3-6-9-# column. Because each key uses two tones, the sound is almost impossible to reproduce with the human voice, so there is little chance that your voice can be interpreted as DTMF. There are four low-frequency tones which correspond to each row of keys, and three high-frequency tones which correspond to each column. One of these tones is a low-frequency tone the other is a high-frequency tone. Each sound is actually two tones played simultaneously. DTMF does more than just let you know that you pressed a key.Įach key has its own sound. This is the technical term for the sounds you hear when you press the keys on your telephone. DTMF stands for Dual-Tone Multi-Frequency. ![]()
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