The
Volume key allows you to adjust the volume level for the currently active audio device (handset, headset, or speaker). When no audio devices are active, pressing the
Volume key adjusts the ringer volume.
Adjusting the Volume of the Ringer, Handset, Headset or Speaker
Note: By performing this function, default volume level will be replaced.
- Press the up or down arrow at either end of the Volume key to reach the desired volume level.
- When you are satisfied with the setting, press the Save softkey.
Note: When adjusting only the ringer volume, there is no need to press
Save. The settings are automatically saved upon adjustment.
See the below link for user manual
http://noc.unet.maine.edu/IPT/7961_7941_User_Guide.pdf