Nirays launched android mobile application “Silentmenot” for  client based in Singapore.

https://play.google.com/store/search?q=silentmenot&hl=en

Have you ever missed an important meeting or an urgent call simply because the vibration from silent mode wasn’t able to get to you? Then SilentMeNot is what you’re looking for!
SilentMeNot has an incredible function of allowing certain calls to go through even on silent mode