Call screening is the process of examining incoming calls based on Caller ID. If the number is a match for a blocked phone number, or is anonymous/private, the call may be blocked or restricted. The call screening feature can restrict calls from different area codes, private numbers, virtual phone numbers, and unavailable callers. Phone numbers identified as VIP customers can be forwarded above other inbound calling rules. Google has recently made call screening mainstream for Pixel 2 and Pixel 3 users with the Google Assistant. It is a new feature for those with Pixel phones. Call screening for VoIP phone systems is done at the provider, not on the device itself.