1. Port opening in not the same thing as port forwarding. Most home routers have facilities for port forwarding but I have yet to encounter one with user settings for port opening. That port opening stuff is really about corporate firewalls etc and can be ignored by those using home routers. The port 10000 is used by Obitalk and is irrelevant SIP providers such as PhonePower. Confirm that you can reach the echo test number **9 222 222 222, then remove any treatment of port 10000 on your router and try the echo test number again.
2. Is this a new PhonePower account or one that you had working on your OBi100? Is it the only service you are configuring on the OBi200? What method are you using to configure?