Index | Freq. 0 | Freq. 1 | DTMF Digit. | Index | Freq. 0 | Freq. 1 | DTMF Digit |
0 | No Tone | - | - | 16 | 950 | - | - |
1 | 697 | 1209 | 1 | 17 | 1100 | - | - |
2 | 697 | 1336 | 2 | 18 | 1400 | - | - |
3 | 697 | 1477 | 3 | 19 | 1500 | - | - |
4 | 770 | 1209 | 4 | 20 | 1600 | - | - |
5 | 770 | 1336 | 5 | 21 | 1800 | - | - |
6 | 770 | 1477 | 6 | 22 | 2100 | - | - |
7 | 852 | 1209 | 7 | 23 | 1300 | - | - |
8 | 852 | 1336 | 8 | 24 | 2450 | - | - |
9 | 852 | 1477 | 9 | 25 | 350 | 440 | - |
10 | 941 | 1209 | * (Star) | 26 | 440 | 480 | - |
11 | 941 | 1336 | 0 (Zero) | 27 | 480 | 620 | - |
12 | 941 | 1477 | # (Pound) | 28 | 697 | 1633 | A |
13 | 800 | - | - | 29 | 770 | 1633 | B |
14 | 1000 | - | - | 30 | 852 | 1633 | C |
15 | 1250 | - | - | 31 | 941 | 1633 | D |
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