Dtmf Threshold - H3C MSR 20-20 Command Reference Manual

Example

dtmf threshold

Syntax
View
Parameter
Use the
undo dtmf time
By default, the persisting time of sending DTMF and the interval for sending DTMF
are both 120 milliseconds.
Note that the configuration will apply to the whole interface once you carry out
the command.
# Set the persisting time of sending DTMF digits to 200 milliseconds, and the
interval to 300 milliseconds.
<Sysname> system-view
[Sysname] voice-setup
[Sysname-voice] dtmf time persist 200
[Sysname-voice] dtmf time interval 300
dtmf threshold analog index value1
undo dtmf threshold analog index
Analog FXS/FXO/E&M voice subscriber line view
analog: Analog voice subscriber line.
index: Index number corresponding to a threshold, an integer in the range of 0 to
12.
value: Threshold corresponding to the specified index. The value range varies with
indexes. For details, see Table 682.
According to the energy level of the row and column frequencies as well as the
energy level of their double frequencies, the system determines whether the input
DTMF digit is valid.
The maximum energy of the input signal in the row frequency group is ROWMAX
and the corresponding double frequency energy is ROW2nd. The maximum
energy in the column frequency group is COLMAX and the corresponding double
frequency energy is COL2nd.
Table 682 Meaning of the index numbers
Index Meaning
0 The lower limit of (ROWMAX +
COLMAX). The input signal which is
otherwise regarded too weak is
recognized as a DTMF digit when
ROWMAX + COLMAX) > 0.
command to restore the default.
Value range
1 to 4,999, with
a default of
1,400
2589
Remarks
The larger the value is,
the higher the detection
reliability is. However,
the sensitivity drops.