Finally figured it out. Needed to adjust my inbound parameters and mapped my Display field to the From field. At that point I changed from DID to CID and set the mask accordingly. Makes a mess of my CID display on the phone but it is not used.
My VOIP provider can not send the inbound DID in the SIP:To field. He is able to prepend it to the Display info field in the SIP:From Information . I cannot find a way to get 3CX to use this field. Only the User Part.
Any work abounds available.