[Karunamon]

Yes, but once you've got this "call screening" set up on your formerly primary phone number, you can safely set your phone to discard all calls from people not on your contacts list.

This introduces two ways of working with the service - either you set the service to show "your" phone number as the calling party, and then listen to the name when picking up, or you ignore this and use the softphone app for all calls.