ICO - Important calls only

Must remain available to certain contacts even when the phone is in silent mode ?
With the application (ICO Important Calls Only) you can configure contacts that you will receive with full ringing
even when the phone is in silent mode. Now also at work meetings, during sleep, emergencies,
or any other time you want to keep the phone in silent mode
You can allow calls from relatives or special contacts to be received with a full ring