On Yealink Phones:
Press "Menu"
Navigate to "Settings" and press "Enter".
Select "Basic Settings" and press "Enter".
- To change the ring tone navigate to Sound > Ringtone > Common, and select the Ring tone.
- To modify contrast or backlight settings navigate to Display > Backlight or Display > Contrast.
On Aastra/Mitel Phones:
Press the "Settings" button on your phone to access the on-screen menu then select the "Preferences" menu and navigate to the desired sub-menu option.
- To change the ring tone navigate to the "Tones" menu.
- To change the display contrast navigate to the "Display" menu.
- Follow the on-screen instructions for making changes.