How to make CallerID=anonymous case insensitive?


Running FreePBX 2.11 on raspberry pi.
I am rejecting anonymous calls by means of inbound route with CallerID=anonymous, DID=(blank) and CID Priority Route = yes. Have trunks from 3 providers and 2 of them supply “anonymous” when caller id is restricted, so this works fine. Third one supplies “Anonymous” (capital ‘A’) and it doesn’t work! But, couldn’t make the same inbound route with capital ‘A’ as CID, it says there is already such route. Workaround was to add a DID of that specific tunk but is there any way to do make one rule working for both anonymous & Anonymous?