I would like to use OBI 110 with phone power. They don't list OBI as tested devices.
Does it work? what do I need to ask from them to make it work with obi?
I use my OBi with Phonepower with no trouble. Since the OBi is not officially supported, you need to enable SIP Credentials and configure it yourself. With that setting, Phonepower limits you to three concurrent registrations and two concurrent calls. If those restrictions are a problem, you might consider connecting one port of your Phonepower-supplied adapter to the Line port of the OBi.