Command Reference Guide

3Com Router 5000 Family and Router 6000 Family vad-on ● 305
Command Reference
vad-on
Purpose Use the vad-on command to enable voice activity detection (VAD).
Use the undo vad-on command to disable VAD.
Syntax vad-on
undo vad-on
Parameters None
Default By default, the silence detection function is disabled.
Example Enable VAD for VoFR voice entity 2.
[Router-voice-dial-entity2] vad-on
View This command can be used in the following views:
■ Voice Entity view
Description VAD is also known as silence detection. Its basic idea is to detect and delete any
silence on the basis of the difference of energy between the voice signals of people’s
conversation and their silence signals, so that no signals are produced; and only when
abrupt activity tone is detected will a voice signal be generated and transmitted. The
research showed that at least 50 percent of transmission bandwidth can be attained
by the use of VAD technology.
Related Command entity