This is a read-write true/false setting that determines whether incoming DNIS digits on this peer are treated as if they arrived over a DID (Direct Inward Dial) trunk. An admin enables this so the gateway correctly interprets and routes calls that come in already carrying a specific extension number, rather than requiring an operator or auto-attendant step. For example, a company using DID trunks to let outside callers reach employee extensions directly would enable this setting so the gateway routes based on the dialed DNIS digits automatically.