Your OBiTalk is what?
I suspect you mean your OBi (100, 110, 200, 202) is trying to auth to Google. OBiTalk does not auth to google. (If you click the button "log on with google account" then it let you auth with google and if you succeed, it will get your name, etc. but NOT your password from google.)
If you use OBiTalk to configure your OBi, then you can click the gear icon next to the device, then click the gear icon next to the correct service provider.
Now on the screen you should see something like:
QuoteSP1: Google Voice™ Account - Home110
(I named my account "Home110" and it is on SP1, yours may vary.)
On that page in the top box (above the "Important Message ...") you see gmail username and password boxes. Fill in the correct application specific credentials and submit.