First off, this is for a land line for my parents. We have been paying for Vestalink since May, when the Google Voice stopped working one day on the Obi100. Lately, I've been having issues with the Vestalink line being unclear, the other side couldn't hear us at times, and there were dropped calls, especially to friends who had MagicJack numbers.
Yesterday, the phone line stopped working and the Obi100 lights started blinking red and green. After doing some fixes, including forum searches, and following the suggestions, my Obi100 was still blinking with alternating red and green lights.
Today, after another round of unplugging and replugging, resetting with a paper clip, and deleting the device from the ObiTalk Dashboard page, I just noticed that the light was a solid green again. I started to add the device again to the dashboard, and was pleasantly surprised to find that Google Voice is working again on the home land line! I'm going to follow some of the others on this thread and just wait it out, until Google Voice will finally stop working, once and for all.