AT&T 2820 - Manual (Page 27)

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In addition to the basic functions, your handset also has a number of
special features.
To select between pulse and tone dial modes:
1. Go to Phone Setup menu > Dial Mode.
2. Use
or to select ‘PULSE’ or ‘TONE’.
3. Touch to confirm.
To change flash time:
1. Go to Phone Setup menu > Flash Time.
2. Use
or to change select flash time (100, 270, 300 or 600ms).
3. Touch to confirm.
Smart Key Lock prevents accidental key activation during a call. A sensor
inside the top of the handset where the receiver is located senses when
your ear touches the receiver and automatically locks the keypad. To ensure
the Smart Key Lock function is activated, make sure to place the handset
receiver to your ear first before speaking into the handset microphone and
avoid touching the keypad with your fingers until the handset receiver rests
on your ear. Smart Key Lock will disengage as soon as you remove the
handset receiver from your ear.
To activate / deactivate Smart Key Lock function:
1. Go to Phone Setup menu > Smart Key Lock.
2. Touch to confirm.
3. Use or to select ‘ON’ / ‘OFF’.
4. Touch to confirm.
HANDSET SPECIAL FEATURES
PHONE SETUP
SMART KEY LOCK