Obihai has resolved the issue with configuring two PhonePower accounts on a single Obi202 device.
Obihai did not issue a firmware update, therefore the fix was only in their provisioning script and the parameters.
One thing I noticed: even though both SP1 and SP2 are "Registered" and work, when I edit the configuration the VOIP Phone Number (xxxxxxxxxx@sip.phonepower.com) setting (in basic mode, not expert) is blank, yet the configuration works.
I recommend doing a factory reset of the Obi202 device, deleting the device from the ObiTalk portal, and then re-adding it. Then resync your PhonePower accounts. You will save yourself a a lot of headaches. You must also disable SIP-ALG on your router, and use the correct port-forwarding settings (or put the Obi202 device in the DMZ zone). If anyone wants the list of ports I can post them here.
Finally, even though both my PhonePower accounts are configured and working, there is obvious latency when calls are forwarded through GoogleVoice. The latency when going through PhonePower directly (outgoing or incoming calls) is minimal and not noticeable. Therefore, we may be porting our GoogleVoice numbers over to PhonePower since most of the services GoogleVoice provides are available there.