MORE INFORMATION AND ANOTHER HYPOTHESIS:
First off, Google kindly restored my access to my voice account, realizing that I was not up to anything untoward.
Also I got to thinking about commonalities in my diagnostic attempts, and I realized that all of the numbers I linked to my obitalk device when I was testing were from the same area code. When I originally set it up I wanted a number in my area code. Anyway I decided to try something different. I created a new GV account and this time I choose a different area code and suddenly I started getting a ringback. Of course this is not a guarantee, but maybe another piece of the puzzle or an avenue for testing.
Also, there is a site called numberbarn where for $6 a month you can park your number and forward it to any number you wish. This way I was able to park my original land line number and then forward it to my GV number so now when anyone calls my original land line it will ring on the phone attached to the obitalk device and I am no longer paying $50 monthly for the land line, which was my goal when I stared down this road.
I realize this will not be a solution for everyone and I am not sure that changing the area code was the solution, however this scenario worked for me.