Try re-installing the CUE software first. If the problem started after a power outage, then it could be a file corruption on the CUE disk. Hopefully, you have a configuration backup somewhere to restore. If you are unable to get the software to re...
The only way to configure this on a SIP to SIP CUBE is with the SUBSCRIBE NOTIFY Passthrough feature which is part of NanoCUBE. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube_nano/configuration/15-mt/nanocube-config-15-mt-book/voi-nanocu...
I believe the only thing that an extension mobility user can change through the web interface is the speed dials. It do not believe there is a way to change the user password through that interface.
The answer is going to depend on the response from the ITSP when the channels are full. If they are just returning 486 Busy, then no rerouting will occur. Can you capture debug ccsip message from the CUBE to see the responses for a call which is be...