Digium, Inc.
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Chapter 3: Telephone System Configuration
Suppression option. For users in loud environments, Suppression
NLP may be the best option. This is the default setting for the Echo
Cancellation NLP Type option.
Echo Cancellation NLP Threshold - This option allows you to spec-
ify the threshold, in dB difference between the received audio (post
echo cancellation) and the transmitted audio, for when the NLP will
engage. The default setting is 24 dB.
Echo Cancellation NLP Max Suppression - This option, only func-
tional when the Echo Cancellation NLP Type option is set to Sup-
pression NLP, specifies the maximum amount of dB that the NLP
should attenuate the residual echo. Lower numbers mean that the NLP
will provide less suppression (the residual echo will sound louder).
Higher numbers, especially those approaching or equaling the Echo
Cancellation NLP Threshold option, will nearly mute the residual
echo. The default setting is 24 dB.
Note: The VPM Settings section will not be visible on older hardware
revisions of the Asterisk Appliance 50.
Once you have made the configuration changes to your hardware which
you require, click Save Changes. A message will display letting you
know that in order for these changes to be completed, you must reboot
your Asterisk Appliance 50. Click Options on the left menu, select the
Reboot tab, and then click Reboot Now to reboot your appliance.
Rebooting your Asterisk Appliance 50 will terminate any active calls.
