I was able to get mine working by going to the web interface of the 200, doing a factory reset, this causes the obitalk site to say your device is not registered. Then it prompts you to dial a number on your 200 which re-registers it with obitalk web site. After this I configured to work with google voice, did the oauth and now it works. One thing I noticed
after the reset and reregister on the 200 unit the web interface now shows the new company name of Polycom, so something was updated on the device itself.