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General Information, Facts & Tables
[Touch Tone Frequencies]

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Overview

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The touch tone frequencies, also referred to as Dual Tone Multi Frequencies (DTMF) are used in telecommunications encode / decode dialing sequences.
  

Touch Tone Frequencies

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Table of Frequencies (by key)

Key

Frequency 1(Hz)

Frequency 2 (Hz)

1

1209

697

2

1336

697

3

1477

697

4

1209

770

5

1336

770

6

1477

770

7

1209

852

8

1336

852

9

1477

852

0

1209

941

#

1336

941

*

1477

941

 

Table of Frequencies (by frequency)

 

Frequency #1

Frequency 2

1209

1336

1477

697

1

2

3

770

4

5

6

852

7

8

9

941

0

#

*