Here is how the products work/will work with Google Voice:
<By the way, Plantronics and Polycom announced a new name for their merged company: Poly.>
The Obihai-heritage products, OBi 200, 202, 1000 and 2000 series, will continue to work with the consumer version of Google Voice. They will not work with Google Voice for G Suite.
The Polycom-heritage products, such as the VVX 150, 250, 350 and 450 will work with Google Voice for G Suite. They will not work with the consumer version of Google Voice.