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This setting allows adjusting the variable that is used for match the inbound number. For many years inbound routes have used destination_number as the variable to match inbound calls. When SIP diversion header is used the destination_number is not always dependable. The variable sip_to_user is more dependable but still fails with how some providers have implemented the SIP diversion header. It appears the sip_req_user is the seems to be the most dependable.