For years I have been using an Obi100 along with PhonePower. It is a great phone service and has worked flawlessly. Recently the Obi100 has stopped sending DTMF tones (probably as a result of some firmware update). As a result I bought an Obi200 and called PhonePower to help me set it up. Their current procedure is pretty easy; give them the MAC address of the Obi200; follow the directions at:
https://www.phonepower.com/wiki/Initial_Sync_Obi202. The upside is that the Obi200 now works with PhonePower; the downside is that they seem to "own" the device now; it is locked; I can no longer log onto it and no other services (e.g. Google Voice) can be set up on SP2, SP3 or SP4.
Jim