R2511-HP MSR Router Series Voice Configuration Guide(V5)

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Table 3 Adjust echo cancellation parameters
S
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m
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tom Parameters ad
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usted Effect
A user hears echoes or loud
background noises from the peer
when speaking.
Speed up the convergence of
comfortable noise amplitudes
Too fast convergence might
make noises uncomfortable.
There are loud environment
noises.
Increase the maximum amplitude
of comfortable noises.
Too large amplitude might make
noises uncomfortable.
A user hears echoes when
speaking.
Enlarge the control factor of
mixed proportion of noises.
Too high a control factor leads to
audio discontinuity.
There are echoes when both
parties speak at the same time.
Enlarge the judgment threshold
for bidirectional conversation.
Too high a judgment threshold
slows down the convergence of
the filter factor.
3. Enable the nonlinear function of echo cancellation
The nonlinear function of echo cancellation, also known as residual echo suppression, means the
removal of residual echoes after echo cancellation when the user at the local end does not speak.
Configuration procedure
To configure the echo adjustment function:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter voice view.
voice-setup N/A
3. Configure echo cancellation
parameters.
echo-canceller parameter
{ convergence-rate value |
max-amplitude value |
mix-proportion-ratio value |
talk-threshold value }
Optional.
By default, the convergence rate of
comfort noise amplitude is 0, the
maximum amplitude of comfort
noise is 256, the comfort noise
mixture proportion control factor is
100, and the threshold of two-way
talk is 1.
4. Exit voice view.
quit N/A
5. Enter voice subscriber line
view.
subscriber-line line-number N/A
6. Enable the echo cancellation
function.
echo-canceller enable Enabled by default.
7. Configure echo duration.
echo-canceller tail-length
milliseconds
Optional.
The default is 0 milliseconds.
8. Enable the nonlinear function
of echo cancellation.
nlp-on
Optional.
Enabled by default.
This command is available only
after the echo-canceller enable
command is executed.