This reports whether this specific call's reverse-charge facility request was refused or accepted, i.e. whether the called party agreed to be billed for the call instead of the caller. An admin can use this per-call to audit billing behavior, since a pattern of refused reverse-charge requests on calls to a particular destination could explain billing disputes or failed connections to that destination. For example, seeing refuse consistently for calls to a specific called channel would indicate that destination's account isn't configured to accept reverse-charge billing.