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Table 7-8 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 |