Just got my first smartphone: Moto G5+ (Android 7.0 Nougat). I would like to set the phone up so that the phone only rings when I get a call from one of my contacts; else, the call goes to voicemail. I thought I was doing that when I set-up Do Not Disturb >> Priority Only>Calls from Contacts. My ringer volume is turned up to 100%. If I do a test call from my old cell phone, the call comes in but there is no sound. I would have no way to know a call was incoming. Under the conditions I described, shouldn't an incoming call ring the phone?