OK, thanks.
Now, on that same page, click the Edit button under Google Chat, and, on the next page, confirm that you haven't set up a calling schedule that would only ring on certain days. Look at the "Groups & Circles" tab of Google Voice Settings, and edit every row. Make sure that Google Chat is selected to ring on inbound calls.
Next, single-click your avatar in the upper right corner of that web page. It's either a colored circle with a letter in it, or a photo you uploaded. Look closely at the email address it shows, like
yourname@Gmail.com. Log onto the OBiTALK website and click on the SP1 or whichever SPx you have configured to use Google Voice. On the page that pops up after you accept the warning about emergency calling, look at the Gmail address that is linked to your OBi, and confirm that it is exactly the same as the one you saw on your Google Voice account.