Indicates the Nlp mode of the port. Options: 1.normalMode(1) -indicates enable the function of non-linear process for echo control performance in default level 2.ecgainMode(2) -indicates enable the function to config the gain value for ec with the non-linear process 3.increasedMode(3) -indicates For certain 2-to-4 wire hybrid or line conditions where a larger than normal non-linear component in the echo is present,setting for an increased level of NLP engagement in order to provide an adequate echo control performance 4.reducedMode(4) -indicates For applications where the default NLP level causes unpleasant voice artifacts (like choppiness at the beginning of the call in heavy double talk situations), the Host may select the NLP Tune setting to reduce the level of NLP engagement 5.close(5) -indicates disable the function of non-linear process for echo control performance 6.dtmfEcMode(6) -indicates DTMF echo elimination