I had to change my gmail password yesterday. If you do that and do NOT change the Obitalk password also...that will give you the message that you received when trying to use the phone UNTIL you change the password in Obitalk. Look at the status panel on Obitalk (once logged on) and see if your phone line says "backing off".
Change the password to the same one that you use for Google and apply it. Follow the instructions to hit F5, wait the 2 minutes and see if it now says "connected".
I had to enter the "new" password 3 times to seem to get it to take hold. I could make phone calls in the interim and then not again when it cycled back to "backing off". After the 3rd time, it seems to have held overnight.
Good luck.