Your mobile is ringing but you don't recognize the number. It could be a cable sales call that you don't have time for right now... or it could be a major new lead for your business. How do you decide whether or not to take the call? This is where virtual PBX services like Voxox Cloud Phone come in super handy -- they offer advanced call settings that allow you to customize how your inbound calls are handled – a.k.a. call screening.