Your phones are configured to adjust the volume of both the ring and speaker when on a call. Follow the steps below to adjust these two types of volume control.
Adjust ringer volume
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Press the left or right arrows when the handset is idle
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Press the save soft key to accept the change or the back soft key to cancel
Adjust the call volume
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While on a call, press the left or right arrows to adjust the volume of the currently engaged audio devices (handset, earpiece, headset, or loudspeaker)