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  | I have used ooma.com which is set up to give address for 911.  The cost was $5 per month.  The voice quality is great when I used that box.  Better than all phones that I have had over the years.  
  
I now use Obihai two port with two cordless phone sets off each port.  After the cost of the hockey puck, there is no cost.  This uses Google Voice and a web portal to set up the Obihai.  It is now called Polycom.  Works well.  The voice quality is almost as good as the ooma.  
  
There are a lot of options now vs 4-5-6 years ago.  
https://www.amazon.com/s?k=voip+phone&i=electronics&crid=MWPA0QMHNXR...  
  
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