OBiEXTRAs isn't required to import contacts to an IP phone, although it is to import contacts to an ATA.
Do it from the OBiTALK web portal, not from the phone. It needs to go through the same OAUTH 2.0 authentication steps as it did when you added Google Voice to the phone -- when you gave it permission to use the XMPP service for GV, that's the only permission you granted. You need to grant it permission to access your Google Contacts.
On the OBiTALK dashboard, click your 1062. On the next page, scroll all the way down to the bottom of the page, and you'll see a blue button to click to start the import process.