zapattack - thanks for the feedback. Yes, SIP is signified under General and my CC credentials are listed under Service Providers for SP3 and 4 but I still get Backing Off.
From what I have read, Backing Off is the GV servers not being able to connect. Perhaps I am missing something very simple and I'm no expert in these matters, but as of now, I cannot figure it out!
I used the dashboard to do the initial set up for CC and am using the web page to change everything else. Not sure where to go next although if I get a free weekend (need to phone during the week as one line if for business), I'm going to reconfigure the Obi to set CC on SP1, then the other CC number on SP2, then the first GV on SP3 and the second GV on SP4 (i've also read that it should be deleted from the dashboard which I did not do the first time). As already stated, I had issues when I initially tried this but this time may try by actually resetting the Obi with the reset button on the unit.