In the Ring Utility App you can set the ringtone for standard calls.
Distinctive ringing settings for external, internal and group calls can be individually set in the Web UI (Settings - Telephony - Connections - Advanded Settings)
You can also upload your own ringtones to Maxwell. All audio files stored in the Android folder "Ringtones" on the device storage will be available in the Ring Utility App.
The ringtone can be uploaded via the Web UI as well. Go to Settings - System - Save and Restore and upload a ringtone file via "Restore device data from PC".