I just received an email from Obi support. This is a Polycom (Poly) company who owns Plantronics:
***********
Hi Lou,
We apologized for the slow response.
This OBi5xx series OBi508 unit model that you have is experiencing issues with basic Google Voice service account (for example, GV account ending @gmail.com + Phone Numbers). Your regular Google Voice service account (xxxxx@gmail.com + Phone Number) is free, meaning there are no monthly or yearly charges to deal with and all the calls (in/out) within the US and Canada are free. But now those regular Google Voice service accounts (again
xxxxx@gmail.com), for this OBi508 unit model (and OBi504) is NOT recommended, NOT suggested for this type of usage, as you are currently experiencing.
In addition, consider using Google Voice service for G Suite (design for businesses) with your OBi508 device instead:
https://9to5google.com/2018/12/02/google-voice-for-g-suite-stable/Further, we have verified your use of multiple Callcentric accounts (SP4 to SP8) with your OBi508 unit xxx xxx xxx and so we suggest that you continue usage of paid commercial SIP VoIP Internet Telephone Service Provider (ITSP) Callcentric.
Please reach out to Callcentric service (or any other VoIP Service Provider) for more controls of functions/features, such as CNAM (Caller ID Name and Number), set up as many extensions per your need, for simultaneous ringing or a hunt group, set up an IVR, etc. And Auto-Attendant.
(But if you have further questions or concerns about your regular Google Voice account
loumarjr@gmail.com, please contact Google Voice (help forum).
And we have refunded your Extended Support purchase. Please allow 5 to 7 business days to complete.
Best regards,
Obi support at Polycom
********************
This is my response:
The Obi508 is still being sold on Amazon as Google Voice (GV) compatible and there is a link to the product on Obi's forum page. I am and always was using the Obi508 for personal calls and never used the product for business purposes. The type of usage on the Obi508 for GV was light.
I visited both links and called Google G Suite and they explained that there is no Google Voice integration with their product. So, there is no way to use the Obi508 with Google Voice, even though it is marketed as Google Voice Compatible.
As for my CallCentric accounts, they are inbound accounts only and you cannot make outbound calls on them. So I effectively cannot use my Obi508.
Lastly, are you confirming that no one can use the Obi508 with Google Voice? This is very confusing. If the Obi508 can be used with Google Voice, what are the conditions?
****************
As we see, it seems that by Polycom claiming to refund my service contract, they are saying that they will not provide technical support for my Obi508 any more. They directed me to a product that doesn't exist. It looks like Polycom let us down and I will never again buy any product for sale by Polycom, including Plantronics.