I'm trying to add backup functionality to a few important numbers in our organization. What I have set up with our telco is that in the event of a downed PRI, I can have certain numbers forwarded to DIDs at another location, and then have CallManager translate those so that they end up at their original intended destination.
For example, someone from the outside dials 123-321-4567. This number is mapped to internal extension 1021234. I have the telco forward 123-321-4567 to 987-789-6543 (in theory, a valid DID at another site). How would I go about having CallManager redirect calls for 987-789-6543 to 1021234?
We have 5 locations, running from a CM cluster in our Saint Louis location. Is my goal achievable? I'd like to have a few numbers from each sight redirected to STL in the event that the remote sites PRI has failed, and I would like to redirect STL to our Kansas City location.
I think I've described everything accurately, but let me know if I omitted important details.