User`s manual

53
Remote receive volume Specify the volume gain of the voice in the
remote side (+5~-20 db, default is -3 db,
default is -3 db).
DTMF volume Specify the volume gain of the DTMF
(+3~-32 db, default is -10 db).
1. Press the “Apply” button (at the bottom) after you finish to save changes.
2. Press the “Reboot” button to apply the changes.