CFUR kicks in just as the name implies, when the phone is unregistered. That's it.
If you're going to combine it with SRST, that means the phone is in a remote location with it's own DID which is reachable via PSTN, so you can redirect callers to the phone when WAN is not available.
No, not the same as secondary number on CME.
HTH
java
if this helps, please rate
www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate