Direct inward dial

Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate a private branch exchange (PBX) system. The feature provides service for multiple telephone numbers over one or more analog or digital physical circuits to the PBX and signals the dialed telephone number to the PBX for internal routing to a PBX extension.

单词	Direct Outward Dialing
释义	Direct Outward Dialing 英语百科 Direct inward dial Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate a private branch exchange (PBX) system. The feature provides service for multiple telephone numbers over one or more analog or digital physical circuits to the PBX and signals the dialed telephone number to the PBX for internal routing to a PBX extension.
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Direct Outward Dialing

Direct inward dial