Silent Time app can automatically Enable/Disable your mobile's silent mode for particular times and days. Its the best app for everyone like students want to use it for class time, People with different religion wants to use for Prayer times or Namaz Times, for daily sleep time, at workplace, while watching Movie or In meetings.
[APP][2.2+]Auto activate ringer when you are away from mobile and receive missed call
You don't have to remember to switch your phone to normal mode after switching it to silent during the meeting. Your phone will do it for you.