First it is necessary that you install PC2Phone software into your PC. Second, turn on VCS and you should notice that: the ON/OFF and DUPLEX buttons must be in GREEN (not RED). Choose a preset nickvoice or a nickvoice you created or adjust the Pitch & Timbre tools as well as other features to have a favorite voice output. Then open PC2Phone program and make a call to another home phone with a different voice .

Note: While calling, you can also adjust Pitch, Timbre, Equalizer, Effects, and Advanced Tune as you like. The Recorder is available for any conversations.