Summary: Cisco offers no real support for their small home business products (unless you pay) and this is no exception. Could not get router to be recognized from any computer. It's possible there was an easy solution, but neither instructions or any of the vague Cisco FAQs offered any real insight as to the problem.
Very confusing configuration set up. I needed help for this.
4 February 2015
Summary: Takes quite a bit of configuration. I use ringcentral for my office and had to contact them and spend some time on the phone to sort it out. Works great now. Same as my old one (Linksys VoIP phone adapter with router). Don't waste your time calling Cisco to help you with the purchase or IT if you can avoid it. I don't think they know what they are doing at all. If you have questions, you may ask on here and I'll tell you what I remember.
Solid, reliable ATA. Never found a better one, especially at this price.
Jon Daley, Amazon
3 February 2015
Summary: This is probably the 6th or 7th SPA122 or 121 router/ATA that I've bought. I've never had one fail, but just keep giving and selling them to others as I've never had any issues. There was a caller-id bug a couple years ago, but I reported it on the forums, and they turned out a beta-firmware for me to try pretty quickly, and I've been happy ever since.