To change the ringer volume: while the phone is on the hook press the Vol + or Vol - button. The phone rings according to the current setting. Tap the Vol + or Vol - button to adjust the volume one setting at a time. The phone stores the setting after the last button press.
To change the speakerphone, handset, and headset volume: while the phone is in use in the desired mode, press the Vol + or Vol - button. The phone stores the setting after the last button press.
The above is from pages 14-15 of the manual at
http://www.rca4business.com/products/pc/pdf/instruction-book/25424RE1.pdf
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