19216811.liveChapter 9 - Engineering
VoIP Configuration
BreezeMAX Si 4000 CPE
117
Operator Manual
DSP Setting (Digital Signal Processing)
Enable VAD
Voice Activity Detection - detects the periods
of silence in the audio stream so that it is not
transmitted over the network.
Enable
Enable/Disable
VAD Tune Level
VAD threshold can be tuned according to the
guideline below:
1
Best bandwidth saving; but lowest quality
for high noise level.
2
Bandwidth saving is reduced and quality is
improved from Option 1. Noise level
above 'very loud noise' (about 5 dB SNR)
is detected as voice.
3
Bandwidth saving is reduced and quality is
improved from Option 2. Noise level
above 'loud noise' (about 10dB SNR) is
detected as voice.
4
Bandwidth saving is reduced and quality is
improved from Option 3. Noise level
above 'less loud noise' (about 20dB SNR)
is detected as voice.
5
Least bandwidth saving; but highest
quality. Noise level above 'audible noise'
(about 30dB SNR) is detected as voice.
1
1 - 5
Enable RTCP
Select this check-box to enable Real-time
Transport Control Protocol
Enable
Enable/Disable
EC Length
Echo Cancellation - Sets the delay time (in
miliseconds) for voice echo cancellation. A
voice echo can be created on some two-wire
phone loops, which becomes increasingly
louder and annoying when there is a long
delay. If voice echo is a problem during a call,
you can adjust this parameter to try and
reduce or remove it.
32
16, 32, 48
JB Delay Min
Jitter Buffer control: JB delays the arriving
packets so that the end user experiences a
clear connection with very little sound
distortion.
Set the minimum and maximum jitter buffer
delay time ( in miliseconds)
JB Delay Max
Table 9-2: VoIP Settings (Continued)
Parameter
Description
Default
Possible Values