Thank you, this was my question.
However, as I have researched the topic further, because OBitalk has reached end of life, as I understand it, you will be unable to port any new GV numbers or make any changes because it is no longer supported.
Therefore, if I purchased an OBi 1000 or 2000 phone I would not be able to port/add a new number to the device.
Now, as I write this, since I do have an OBI200 box working, I essentially already have a ported number to OBiTalk so maybe I could just plug this new hardware in and get it working.
That said, with the prospect of it working 'until further notice' does not give me much comfort as this is an office phone/number.