Direct Inward Dial (DID)

Direct inward dialing is a service of a LEC (see LEC) or local phone company that allows an organization to have numerous individual phone numbers for each person or workstation in its PBX (see PBX) system. DID allows the multiple lines to be connected to the PBX all at once without requiring each to have a physical line connecting to the PBX. The DID system can also be utilized for faxing and voice mail.