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Advanced Volume Controls for the Headset Mic On the 6753i, there are 3 options for the headset microphone volume. For more information about the headset microphone, see “Headset Mic Volume” on page 27. IP Phone UI To change the volume: 1. Press to enter the Options list. 2. Select Preferences and press 4. 3. Use 2 to scroll down to Set Audio and press 4 to select. 4. Press 2 to scroll down to Headset/Mic Volume and press 4to select. 5. Use 2 to scroll down the list and press 4 to select your des