Love it, just ordered two of the flashback models! To me, the killer feature is the whitelist for incoming and outgoing calls. Is anyone aware of a VoIP provide

Love it, just ordered two of the flashback models! To me, the killer feature is the whitelist for incoming and outgoing calls. Is anyone aware of a VoIP provider that offers this? Ooma has a contacts-only calling feature, but 1) only on their Premier plan that costs $10/month plus taxes and fees, and 2) it’s not clear that it also restricts outgoing calls. I have not found any such feature listed for Vonage or Verizon’s digital voice, to name a few.