8.3.10. OpenScape Mobile Pro Rings when "Do Not Disturb" is Turned On 
OpenScape Mobile Pro does not have a way to discover that "Do Not Disturb" is on.
In the Android operating system, the native "Do Not Disturb" settings apply only to
cell phone
calls. Other applications are prevented from accessing that setting.
‣ Parent topic: Section 8.3. Troubleshooting Specific Issues