Shush Ringer Restorer on MIUI

MIUI is a careful, fluid Android mod that's gaining popularity with Android hobbyists. Unfortunately, it has a misguided feature that breaks Shush! Ringer Restorer.

Follow these steps to disable that feature and fix Shush:

Go to the Settings app.

Select the Programs tab.

Select the Call Settings option.

Toggle Third party app access to off.

Further details are on the MIUI forums.