Configuring Adjustment Functions; Configuration Task List; Configuring Echo Cancellation - HP FlexNetwork MSR Series Configuration Manual

Step
4. Bind a calling/called number
substitution rule list to a
voice subscriber line.
For more information about the operation of the above commands, see "Configuring dial plans."

Configuring adjustment functions

Configuration task list

Task

Configuring echo cancellation

Configuring gain adjustment function
Configuring time adjustment function
Configuring comfortable noise function
Configuring PCM pass-through function
Configuring echo cancellation
Echo cancellation
An echo is the audible leak-through of your own voice into your own receive path. When the voice of
a user leaks into the receive path of the user, it is an echo. To cancel echoes, adjust the echo
cancellation function in the VoIP gateway as follows:
1. Adjust echo duration
Table 2 Adjust echo duration
Symptom
A user hears a
delayed copy of the
original voice of the
user.
2. Adjust echo cancellation parameters
Table 3 Adjust echo cancellation parameters
Symptom
A user hears echoes or loud
background noises from the
peer when speaking.
There are loud environment
noises.
Command
substitute { called | calling }
list-number
Reason
The echo duration is so long that the
convergence time of echo cancellation on the
network becomes longer.
The echo duration is so short that
long-duration echoes are not completely
cancelled.
Parameters adjusted
Speed up the convergence of
comfortable noise amplitudes
Increase the maximum
amplitude of comfortable
noises.
49
Remarks
By default, no number substitution
rule list is bound to a voice
subscriber line.
Remarks
Optional.
Optional.
Optional.
Optional.
Optional.
Adjustment method
Shorten echo duration
Prolong echo duration
Effect
Too fast convergence might
make noises uncomfortable.
Too large amplitude might make
noises uncomfortable.