incoming DID number DDI local DID number DID Direct Inward Dialing by Wikipedia DID DID DID Direct Dialing (DDI/DID) DID direct inward dialiing DID DDI DID Direct Inward Dial DID number incoming DID number Direct Dial Inward port them over as DIDs local DID number Direct Dial Inward DID Numbers Wiki local DID number 20 channel DID Wikipedia on Direct Inward Dialing DDI