Definitions for "Direct Inward Dialing"
Keywords:  centrex, pbx, ddi, switchboard, did
DID PBX or Centrex optional feature that permits outside calls to be placed directly to a station line without use of an operator.
(DID) A telephone service with which subscribers can have calls within a system routed to a specific telephone without switchboard assistance.
Incoming calls from the exchange network can be completed to specific station lines without attendant assistance. Also called DDI.