One of the things you need to consider when moving to VoIP is what are you going to do about E911.
Obihai has a partnership with Anveo to offer E911 serivces to Obihai customers for $12 per year. The instructions are here.
Alternatively you can use the copper pair of the POTS line you just disconnected! POTS carriers (and cellular carriers) are required by law to handle 911 calls even if there is no subscribed service.
There are 2 ways to do this. The first is to keep a phone plugged into your old house wiring and use that for calling 911. That's my plan.
The second is to use a OBi110 with a line port. Plug your old house wiring into this port and you're done. Here's a review from Amazon where someone has done exactly this.