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DTMF Digit Specifications

Table 8-8 DTMF digit specifications

BCD | DTMF Digit | Frequencies (Hz)
--- | --- | ---
0 | 0 | 941 Hz + 1336 Hz
1 | 1 | 697 Hz + 1209 Hz
2 | 2 | 697 Hz + 1336 Hz
3 | 3 | 697 Hz + 1477 Hz
4 | 4 | 770 Hz + 1209 Hz
5 | 5 | 770 Hz + 1336 Hz
6 | 6 | 770 Hz + 1477 Hz
7 | 7 | 852 Hz + 1209 Hz
8 | 8 | 852 Hz + 1336 Hz
9 | 9 | 852 Hz + 1477 Hz
A | A | 697 Hz + 1633 Hz
B | B | 770 Hz + 1633 Hz
C | C | 852 Hz + 1633 Hz
D | D | 941 Hz + 1633 Hz
E | * | 941 Hz + 1209 Hz
F | # | 941 Hz + 1477 Hz

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