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Adjust the corded handset audio
1. Make sure that LIFTER MODE light on
the headset base is on. Press the MODE
button on the headset base to change
the mode.
2. Lift the corded handset to release
the switch hook. Place the corded
handset aside.
3. Place the headset earpiece in your ear.
4. Press ON/OFF on the headset to listen for a dial
tone. If there is no dial tone or the dial tone is
unclear, slide the LIFTER AUDIO ADJUST switch
on the side of the headset base from A to G until
the dial tone is clear.
Headset base and handset lifter installation