Well, that screenshot shows that the extension isn't registered on your OBi, so you've not set it up correctly.
Delete the SPx that you used for Callcentric. Click on the SPx. Decline the offer to set up Google Voice. Scroll down to the bottom of the page, and click "OBiTALK Compatible Service Providers". On the next page, scroll down to the bottom of the page and click Callcentric.
On the next page, enter the Callcentric username (17778850423) and the SIP password you entered on the Callcentric page you posted. Do not enter your Callcentric account password. If you are not sure about the SIP password you entered, then enter a new one, twice, and save it on the Callcentric dashboard. Submit the change on the OBiTALK page.