This app will automatically restore your ringer volume after a set period of time so that you do not miss important notifications because you forgot to unmute your phone after your meeting.

It can be run manually or it will automatically pop up when you put your phone on vibrate/silent. You can choose a mute time from 15 minutes to 8 hours in 15 minute intervals. It will show you a low priority notification of how much longer your phone will be silent from which you can cancel or extend the timer easily.