
MT5634HD8/16 User Guide
44 CommPlete Communications Server
Figure 3. Standard DTMF frequencies
The extended DTMF characters (A, B, C, D) are the high-end frequencies (1633 Hz) defined on some
telephone sets with a fourth vertical column of buttons. This fourth column provides for extended PBX
control functions. The actual functions that are provided depend on the PBX manufacturer’s
implementation and feature set.
1 2 3
4
A
5 6 B
770
697
7 8 9
*
C
0 # D
941
852
1633147713361209
Hz
DigitsHz
Figure 4. Extended DTMF frequencies
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