Yes, that's the first thing to try - plug the VOIPo device into your modem and see if all is well. I'd just try step 1 and see if you can make and receive calls after. Of course, after you do step 1, you'd first turn on the power to the modem and then the VOIPo device (once the modem is up and running). I would not even worry about step 2 while testing out phone service.
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