Command Reference Guide

3Com Router 5000 Family and Router 6000 Family silence-th-span ● 261
Command Reference
silence-th-span
Purpose Use the silence-th-span command to set the silence detection parameters that
have the system take automatic on-hook action.
Use the undo silence-th-span command to restore the default.
Syntax silence-th-span threshold time-length
undo silence-th-span
Parameters threshold
Silence detection threshold. If the voice signal from the
switch is smaller than this value, the system regards it
as silence. This threshold ranges from 0 to 200 and
defaults to 20. Normally, the signal amplitude on the
links without traffic is in the range 2 to 5.
time-length
Duration of silence detection. Upon expiration of this
duration, the system goes on-hook automatically. It
ranges from 2 to 7200 (default) seconds.
Example Set the silence detection threshold to 20 and the duration to 10 seconds.
[Router-voice-line0/0/0] silence-th-span 20 10
View This command can be used in the following views:
■ FXO Subscriber-Line view
Description Silence detection-based disconnection applies to prevent an FXO interface from
hanging when the busy tone parameters provided by the connected PBX are special.
In normal cases, you need not to use this function to tune the busy tone detection
parameters and any misconfiguration may result in incorrect disconnection.
When configuring this command, you are recommended to test multiple parameter
sets for the one that allows quick resource release on the FXO interface after the user
hangs up while eliminating the likelihood of incorrect on-hook.