There is a module ‘Set CallerID’ is it possible to send the call to this destination prior to forwarding .
Eg for Anonymous inbound calls after hours, we identify as callerid on inbound route , send the call to Set CallerID as office number, the send to extension with follow me, makes it easy for on call staff to identify office calls
I use that on my personal PBX to point show which DID is being called. This solution however would not be appropriate for this particular customer as they have multiple ring groups sending calls to multiple different numbers and there is no way to split things up to route specific calls through this module.