=== DTMF/Touch tones ====
A 697 Hz + 1633 Hz
B 770 Hz + 1633 Hz
C 852 Hz + 1633 Hz
D 941 Hz + 1633 Hz
* 941 Hz + 1209 Hz
# 941 Hz + 1477 Hz
1 697 Hz + 1209 Hz
2 697 Hz + 1336 Hz
3 697 Hz + 1477 Hz
4 770 Hz + 1209 Hz
5 770 Hz + 1336 Hz
6 770 Hz + 1477 Hz
7 852 Hz + 1209 Hz
8 852 Hz + 1336 Hz
9 852 Hz + 1477 Hz
0 941 Hz + 1336 Hz

=== MF tones ===
2600 Hz
KP 1100 Hz + 1700 Hz
ST 1500 Hz + 1700 Hz
1 700 Hz + 900 Hz
2 700 Hz + 1100 Hz
3 900 Hz + 1100 Hz
4 700 Hz + 1300 Hz
5 900 Hz + 1300 Hz
6 1100 Hz + 1300 Hz
7 700 Hz + 1500 Hz
8 900 Hz + 1500 Hz
9 1100 Hz + 1500 Hz
0 1300 Hz + 1500 Hz

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