Net research NetProbe 2000 User Manual page 306

Multimedia Tab
Ring sound – you can choose what sound is used as ring tone. Click Play button to
preview chosen sound.
Volume – adjust the audio volume.
Enable echo cancellation – check this option to use echo cancelation. Echo cancellation
provides that the person on the other end will not hear an echo. If you don't wish to
hear an echo then the person on the other end of the call also needs to select an echo
cancellation for their device.
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