Got this from Callmaster IV(603F1) documentation. Hope this information helps.
ENABLING/DISABLING THE MUTE BUTTON
To enable or disable the Mute function
1 While on-hook (the headset must be unplugged), press [Select ].
- The light next to [ Select ] goes on.
2 Press [ Mute ].
- The CALLMASTER set is in option programming mode.
3 Dial the 2-digit code, "68" ("MU".
- The current setting (Enabled or Disabled) is shown on the display.
4 Dial [ * ] to change the setting.
5 When the setting you prefer is shown on the display, press [ # ] to save it and exit programming mode.
Of course, since our help desk people answer computer questions, they need the mute button to blow off steam. But you never know, we might need it some day.
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