Click on your illumy avatar.
From the drop-down select, Settings.
Select Notifications - if it is not already selected.
Receive desktop notifications for new messages and important activities
Incoming message - I selected “Intuition” - go through the other options and select one you like.
Outgoing messages - I also selected “Intuition” for my outgoing messages notification.
My Incoming call sound is “Xylophone”.
There are many other choices. Click the dropdown and then the play button to select a ring that suits you!