There is no way to re-route the calls with CCM. But you can ask your telecom provider to re-route calls. When the WAN fails, gateway on central site cant see phone on remote site, and if you dont use forward call to VM , call will be rejected as unknown number. Telecom provider can use this rejected to re-route (forward) call to E1 on your remote site to number you user there. On remote site you make translation calling number.
Previous comments about there being no facility in CCM to re-route the calls is correct (we've been asking for this feature now for 5 years!). Anyway there are some potential workarounds, but they are all manual changes and will require reverting once your WAN is back.
Depending on how you've configured your incoming DDIs at the central site, you could add a temporary translation pattern to convert those calls to DDIs at the remote site (assuming you have remote DDIs) or decide to pass them all to a single DDI at remote site. This will result in hairpinned calls.
You could decide to configure a similar re-route using CFWA on each phone (again dependant on remote DDIs).
You could temporarily enable CFWA to VM on every phone and advise the remote users.
You could translate all the incoming central DDIs to a central operator and get that person to then manually re-route the calls back out to the remote site.
As you can see there are a number of options, but you will not get automatic re-routing in the event of a WAN failure.
Automatic call routing won't work in case of a WAN failure.
In your scenario, we can translate incoming calls (say, when someone dials a particular number, we can make it hit a translation pattern and then send it out to the remote site via a gateway), but this will have to be done manually, when the WAN fails.
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