Update, I have a spare obi202 at home and after trying a factory reset, no joy (internet worked but not phone lines) I decided to confirm with brand new unit. As suspected it started up phone and provided a dial tone. Oh happy day!
Then I registered the device with Obi. Not quite sure late last night how to setup the new device and thus left a ticket with Anveo. Woke up this morning and the response was waiting. I re-provisioned the device and now can receive and place calls again!! Two lessons learned, if dependent upon having the phone line up and running ensure one has a spare on hand. Luckily the sale this weekend for a 202 was excellent so my new spare is on the way. Second, dont play with old powered door bell systems that interacted with the phone lines (rang the phone lines). Somehow I must have sent voltage back along the lines that fried the OBIHAI2.
I was very much thinking of going the smarthome doorbell route and that is now cemented in as my way forward. Enough of old tech LOL.