See:
http://www.obitalk.com/forum/index.php?topic=12492.0Use OBi Expert to make the config changes.
There is a bug in the firmware that causes some devices to fail registration.
Go to:
Status -> System Status
Scroll down to SP4
If the 7965G is registered, its IP address will be displayed.
If it's not registered, do the following:
Change to 7965G to not register. Not all phones have this option.
Voice Services -> SP4 Service -> X_Proxy: Unchecked
Voice Services -> SP1 Service -> X_InboundCallRoute:
ph,sp4(OBi200@xx.xx.xx.xx:pppp)
Replace xx.xx.xx.xx:pppp with the IP address and port of the 7956G