I finally decided to go to OAUTH 2.0 authentication for Google Voice and ditch my CallCentric account since I don't really use any of the CallCentric features. I'vefollowed (in detail) the setup instructions found on elsewhere on the forum. However, Google Voice connection status shows "Backing Off (0s): Authentication error".
I know it isn't a username/password issue considering I am using OAUTH to authenticate and OAUTH successfully authenticates to the ObiTalk web portal. I've done a factory reset and started from scratch with the setup, without success. I can also successfully log in to other services using OAUTH.
There is very little debugging info available and I have opened a support case with Obi, but they have been unresponsive.