Hi: sorry to hear that my previous posts didn't get this working. Is this a brand new out-of-the-box phone, or was it previously used with a business-class service provider? Did you try restoring it to factory defaults and then setting it up again?
Are you using a consumer
Gmail.com account, or a G Suite account (the 2182 will only work with consumer Gmail accounts)?
If you were able to add it to your dashboard, and I assume you meant that SP1 says "Connected", not just the device in general, then it should at least be able to make calls.
You may have accidentally authorized SP1 to the wrong Google/Gmail account, if you don't see it on the Google Voice settings page as an "OBiTALK Device".
Google allows multiple accounts to be signed into a web browser at the same time. Some Googly things can keep this straight, but others, like Google Voice, have problems. To solve this...
Open a laptop/desktop computer's web browser. If you're using Google Chrome Browser or Safari, press Ctrl-Shift-N to open an incognito window, or, if you're using Firefox, press Ctrl-Shift-P to open a private window. In that window, sign into the correct Gmail account that holds your Google Voice number, and go here:
https://voice.google.com/settings. Do you see your Google Voice number at the top of the page? If not, this is the wrong Gmail account--find the right one.
If you found it, then press Ctrl-T to open another tab in that private/incognito window, and go here:
https://myaccount.google.com/?pli=1.
Go to the Security section. Scroll down to the section: "Third-party apps with account access", then "Manage third-party access". Do you see an "OBiTALK Google Voice" permission? If not, then the OBiTALK setup didn't complete, or you set it up on a different Google account. If you do see it, then delete it.
After deleting the permission, while still on the private/incognito browser, press Ctrl-T to open another tab. In that tab, go here:
http://www.obitalk.com/obinet/pg/obhdev. Delete SP1 and then add it again, making darn sure that, when it pops up the window asking your permission to access your Google account, it's asking for the correct account.
Did that solve the problem?