hpnicfVoiceIfCfgOutputGain 1.3.6.1.4.1.11.2.14.11.15.2.39.13.1.1.1.4

This object indicates the amount of gain added to the send side of the voice interface. Unit is 0.1 db. It is applicable to FXO, FXS, E&M subscriber lines and E1/T1 voice subscriber line.