Re-directing unknown CLI to a different Extension

I am using the free Digium Switchvox for my VoIP and want to know if the following is possible to program.

People calling me who do not present their CLI (either witheld, unknown, international etc) then I want them to go to a different extension number which will have a recorded message saying "please call back and un-withold your number - Prefix the dialled number with 1470 from the UK or leave a VM if you're unable to do this"

Anybody know how to do this?


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