Medion LIFE S63064 Manual De Instrucciones página 183

Key lock
To prevent accidental dialling when you are carrying the handset with you,
you can activate the keypad lock. This is not possible during a call.
 Hold down the asterisk key until the symbol for the
key lock appears on the display.
NB:
This will not affect your ability to receive calls.
 To deactivate the keypad lock, hold down the asterisk key

Switching off the ring tone
 To switch off the ring tone, press and hold the
hash key.
The symbol is displayed.
 To switch the ring tone back on again, press and hold down the hash key.
The symbol disappears on the display.
Muting the telephone
 To mute the telephone, press the left control key "Mute" during a call.
"Call Muted" appears on the display. The caller is now unable to hear you.
To end muting, press the left control key again.
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until the symbol for the key lock disappears.