Application – RingingRestorer for Nokia N9/N950 – MeeGo Harmattan

Restores ringing profile automatically after a timeout.

After you select ‘beep’ or ‘silent’ profile, the program will ask you how long you want this setting to last (max.12 hours). When this set time has passed, your regular ringing profile will be restored. You can also set the restored ringing volume in advance.
Very handy for people who often need to silence the ringer for a while, for example for the duration of a meeting, a movie or a short nap.
The application auto-cancels in 15 seconds unless interacted with.
 
Source N9 Apps