Things You Should Know DS/ITP-5012L Phone User Guide
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7. Volume Adjustment
[TVolumeS] buttons are used for adjusting the volume of the handset,
speaker and ringing.

Adjusting Handset Volume

1. Lift the handset and make a call
2. Press the [VolumeS] button to increase
the handset volume.
OR
Press the [TVolum e] button to decrease
the handset volume.