First, log onto your OBiTALK account. Then, go to the dashboard and click the OBi 110 device. Then, click the blue and white button to delete the device. You need to get it off of your OBiTALK account so the next person can use it. Wait a few minutes for the 110 to be remotely reset, and then pick up the phone and key in ***8 then 1 to restore factory defaults, and after it reboots, unplug it and you are done with the old, and ready for the new.
After doing that, if you haven't already done so, add the OBi 200 by clicking the Add Device link on the main dashboard page. After adding it, you can configure SP1 to use Callcentric: Click the SP1 link. On the next page, scroll down to the bottom and click on "OBiTALK Compatible Service Providers". On the next page, click on Callcentric. You'll need your Callcentric SIP user ID (1777xxxxxxx) and SIP password (which you previously set up on Callcentric's web site). If you forgot the SIP password, just edit it over on their website and type in a new one.