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2591
Description Use the dtmf threshold command to configure the sensitivity of DTMF digit
detection.
Use the
undo dtmf threshold command to restore the default.
The dtmf threshold command issues the thresholds for DTMF dial tone detection
to the underlying layer DSP for the purpose of tuning detection sensitivity and
reliability of the device subtly. Inside the DSP, a set of generic default values have
been configured. They are 1,400, 458, -9, -9, -9, -9, -3, -12, -12, 30, 300, 3,200,
375, with their index being 0 through 12. Professionals can use this command to
adjust the device when DTMF digit detection fails. In normal cases, the defaults
are adopted.
Example # Set DTMF threshold 9 in voice subscriber line 1/0.
<Sysname> system-view
[Sysname] voice-setup
[Sysname-voice] subscriber-line 1/0
[Sysname-voice-line1/0] dtmf threshold analog 9 40
echo-canceller
Syntax echo-canceller { enable | tail-length milliseconds }
undo echo-canceller { enable | tail-length }
View FXS/FXO/E&M voice subscriber line view
Parameter enable: Enables the echo cancellation (EC) function.
10 The frequency of the first extra
frequency point specified for
detection.
In addition, it must be a frequency
100 Hz greater than or less than the
row and column frequency groups.
300 to 3,400 Hz,
with a default of
300 Hz.
-
11 The frequency of the second extra
frequency point specified for
detection.
In addition, it must be a frequency
100 Hz greater than or less than the
row and column frequency groups.
300 to 3,400 Hz,
with a default of
3,200 Hz.
-
12 The lower limit of the amplitude of
the input signal. The average
amplitude must be greater than this
threshold for the input signal to be
recognized as a DTMF digit.
0 to 700, with a
default of 375.
The larger the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
Table 682 Meaning of the index numbers
Index Meaning Value range Remarks