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I used the Obi to transfer land line numbers to Google Voice and ring an analog phone and fax connection on the two ports.
The only small challenge was the enrollment for the device, it took many tries to get the code registered but once that finally went through the rest of the process was easy with the built in automatic configuration for the google voice accounts (when credentials were provided).
I started using these many years back when I canceled my home land line. Now I use Google Voice and my cost is Zero. Sound quality is great. You can set up call forwarding to a cell phone. It screens calls and blocks spam. Voicemails come to my email. Also, you can just plug in a regular old phone to the back and it will ring and work just as though you have an old fashioned land line.
I wanted to use a land line telephone with Google Voice, so I purchased this device. It was easy to set up and has been working fine for about 4 years now. If I have a power outage I receive a notification. Otherwise it just sits there and does its job flawlessly. I would highly recommend this product if you want to use a landline phone with VOIP for Google Voice.
Just follow the instructions. I did have to change the ATT router settings for the ports to be active for it. Great sound quality. I was about to renew magicjack, but bought this instead and linked to google voice. Free phone now!