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2590 CHAPTER 173: VOIP CONFIGURATION COMMANDS
1 The upper limit of the maximum
value of ROWMAX or COLMAX,
whichever is larger. This limit is used
for detecting the inter-digit delay. A
detected digit is regarded ended only
when max (ROWMAX, COLMAX) <
1.
1 to 4,999, with
a default of 458
The smaller the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
2 The lower limit of
COLMAX/ROWMAX, where
ROWMAX < COLMAX. An input
signal is recognized as a DTMF digit
only when 10 x
(COLMAX/ROWMAX) > 2.
-18 to -3 dB,
with a default of
-9 dB.
The larger the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
3 The lower limit of
ROWMAX/COLMAX when COLMAX
Š ROWMAX. The function is similar
to that of index 2. An input signal is
recognized as a DTMF digit only
when 10 x (ROWMAX/COLMAX) >
2.
-18 to -3 dB,
with a default of
-9 dB.
The smaller the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
4 The upper limit of the ratio of the
second largest energy level from the
row frequency group to ROWMAX.
The ratio must be lower than this
limit for the input signal to be
recognized as a DTMF digit.
-18 to -3 dB,
with a default of
-9 dB.
The smaller the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
5 The upper limit of the ratio of the
second largest energy level from the
column frequency group to
COLMAX. The ratio must be lower
than this limit for the input signal to
be recognized as a DTMF digit.
-18 to -3 dB,
with a default of
-9 dB.
The smaller the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
6 The upper limit of
ROW2nd/ROWMAX. An input signal
is recognized as a DTMF digit only
when ROW2nd/ROWMAX < 6.
-18 to -3 dB,
with a default of
-3 dB.
The smaller the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
7 The upper limit of
COL2nd/COLMAX. The ratio must
be lower than this limit for the input
signal to be recognized as a DTMF
digit.
-18 to -3 dB,
with a default of
-12 dB.
The smaller the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
8 The upper limit of the ratio of the
maximum energy level of two extra
specified frequency points to max
(ROWMAX, COLMAX). The ratio
must be greater than this upper limit
for the input signal to be recognized
as a DTMF digit.
-18 to -3 dB,
with a default of
-12 dB.
The smaller the value is,
the higher the detection
reliability is. However,
the sensitivity drops.
9 The lower limit of the DTMF signal
duration. The duration of DTMF key
tone must be larger than this
threshold for the input signal to be
recognized as a DTMF digit.
30 to 150
milliseconds,
with a default of
30 milliseconds.
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