Configuring Dtmf Properties; Configuring Dtmf Detection - HP FlexNetwork MSR Series Configuration Manual

Figure 13 DTMF keypad frequencies
697Hz
770Hz
852Hz
941Hz
A DTMF signal must last at least 45 milliseconds. A minimum interval of 23 milliseconds is required
between two DTMF signals to make sure that DTMF signals are recognizable. Such requirements
are roughly the same in all countries. For more information, refer to the ITU-T Recommendation
Q.24.

Configuring DTMF properties

Step
1. Enter system view.
2. Enter voice view.
3. Configure the duration of
DTMF tones and the interval
between successive DTMF
tones.
4. Configure a DTMF signal
amplitude.
NOTE:
The dtmf time and dtmf amplitude commands in voice view have global significance. Once you
carry out either of the two commands, the configuration will take effect on the whole device.

Configuring DTMF detection

Introduction to DTMF
Use the following ways to detect DTMF:
Column Frequency Group
1209Hz 1336Hz
1 2
4 5
7 8
*
0
Command
system-view
voice-setup
dtmf time {interval | persist }
milliseconds
dtmf amplitude value
1477Hz 1633Hz
3 A
6 B
9 C
# D
47
Remarks
N/A
N/A
Optional.
By default, 120 milliseconds for
both.
Optional.
The default is –9.0 dBm.