You can restrict incoming calls based on many different factors. You have complete control over which types of phone calls make it past your internet phone system. Call screening criteria: Caller ID number "Private" caller ID Unavailable caller ID Time of day Day of week These specific details can be used in conjunction with each other for the ultimate filter for incoming calls. You can segment each call to your inbound call center based on these criteria. For inbound calls outside of business hours, you can play a greeting message that explains how the customer can get in touch.