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Voice Feature Guide 01

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Non-Linear Processor

Non-Linear Processor


Owing to various reasons, the EC cannot cancel all the echoes. To improve the EC performance, a non-linear processing (NLP) is performed on the remaining echoes when the power of the remaining echoes is lower than a preset value. This can further reduce the power of the remaining echoes. A simple method is to replace the remaining echoes with the silence when the power of the remaining echoes is lower than the threshold.


The NLP function can be enabled or disabled by configuring the DSP profile on a port. If the DSP profile is not configured, the system automatically enables or disables the NLP function according to the service mode. Specifically, for the voice service, the system enables the NLP function; for the fax or modem service, the system disables the NLP function.


The NLP function must be disabled in the case of FoIP or MoIP.

Reference Standards and Protocols

ITU-T G0.168, ITU-T G0.131, and ITU-T G0.161

Updated: 2019-02-22

Document ID: EDOC1100067358

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