Get rid of GrooVeIP; it can interfere with OBi use of your Google account, and it is insecure. Use Google Hangouts instead. It's officially supported, and it makes and receives calls using your Google Voice telephone number.
There is something wrong with your configuration. You should not have to enter **1 before a call.
Log onto your Google Voice account on a laptop or desktop computer, not on a mobile browser, and go here:
https://www.google.com/voice#phonesConfirm that you see the exact two words "Your number" on the left side of that page, not "Access number" nor "Get a Voice number". If so, then click your avatar in the upper right corner of that page. Look carefully at the Google username it displays (e.g.
ruckus@gmail.com).
Log into the OBiTALK web portal, and click on your 202 device. Confirm that SP1 is connecting to the same Gmail address. Confirm that the Phone Port Configuration Summary section shows that SP1 is the default for outgoing calls, and that it is set to ring Phone 1 on inbound calls. See the screenshot attached.
Look at the back of the 202. Confirm that you have plugged the phone cord into Phone 1, not Phone 2.