3Com MSR 50 Dtmf threshold, Meaning of the index numbers, 2589, Index Meaning Value range Remarks

2589

Use the undo dtmf time command to restore the default.

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.

Example # 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

Syntax dtmf threshold analog index value1

undo dtmf threshold analog index

View Analog FXS/FXO/E&M voice subscriber line view

Parameter 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	Value range	Remarks
0	The lower limit of (ROWMAX +	1 to 4,999, with	The larger the value is,
	COLMAX). The input signal which is	a default of	the higher the detection
	otherwise regarded too weak is	1,400	reliability is. However,
	recognized as a DTMF digit when		the sensitivity drops.
	ROWMAX + COLMAX) > 0.