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Add GV as a service provider. When you go through the procedure, it will use OAUTH 2.0 to authenticate to your GV account. This will pop up a window, from your Google account, and it will ask you to approve giving OBiTALK permission for offline access to your account. Once you do that, the OBiTALK provisioning system will go through the authentication process with Google, and it will automatically download the necessary firmware to your device, if it's not already installed. You will see a spinner icon while this is happening. You can't make this work properly without using the portal.
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I made it all the way to this step, but got no pop up window. I selected Google voice within the approved service providers. It was shown there twice. At the top and at the bottom left hand side of the page.
All I have on my dashboard is a softphone listed.