Got the Ooma a couple of days after I ordered. I placed a "port" order to have my phone # moved over to that service on 12/17. The port from AT&T was completed today.
I plugged the Ooma into power, set it up via the app (of course) and got a message that all's good.
After the port was completed, I plugged my 6-handset Panasonic phone into the Ooma Telo (the box). Worked perfectly. The only difference is that the Ooma plays a brief, different, dial tone when you pick up the handset.
Quality of the voice is good - at least as good as a landline.
What I really like is the "call log." Ooma remembers all incoming and outgoing calls, and you have the option to block any caller from the list of incoming calls. I guess they have a deal with Nomorobo, and for an additional $100 for "Ooma Premiere," you can have Nomorobo block calls as well.
I'll wait to see how it goes before I spring for the "premium" service.
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It also has a voicemail feature - you can retrieve voicemail from the Ooma Box, but according to their tech support, your own answering machine will work as well.