We have a VOIP service that has a Do Not Disturb function and also supports a whitelist. We keep DND on permanently and have put the numbers of friends, family, doctors, etc. on the whitelist. So, when they call, they get right through. Everyone else goes to voicemail (without the phone even ringing). It works very well. The only time the phone rings is when it is someone we want to talk to. We use Voipo, but many VOIP providers offer similar functionality.
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