To make the use of the application settings convenient you have the possibility to group contacts into Groups.
To create new groups go to the mode settings "Only from ..." or "Except ..." (it doesn’t matter for the creation of the new Group).
Further, in the bottom of the screen next to the group header, click on the plus, set the name of the Group and select the participants, then press back. The group was created and is available for selection in the function "Only from ..." and "Except...".
When using the application, the following allows you to see the name of a contact that reached you: "Name" or _. This is due to some peculiarity of working with contacts with multiple user groups. Do not worry; contacts have not changed their name.
After deactivating the "Do not disturb" function to make the receiving incoming calls from certain contacts not to display in this form, then just go to CallFilter and select "from anybody." Or uncheck the Groups or "selected" contacts through the settings "Only from ..." and "From all except .."
Download CallFilter for iPhone 4/4s/5/5s/6/6Plus
You can download newest version 2.0 of CallFilter in Apple AppStore right now using link