DID (Direct Inward Dialing)
A phone number that routes directly to a specific extension or user, bypassing a receptionist.
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A phone number that routes directly to a specific extension or user, bypassing a receptionist.
Direct Inward Dialing, usually shortened to DID, is a phone number that connects a caller straight to a particular person, desk, or endpoint inside an organisation instead of landing on a main switchboard.
DIDs are the basic unit of supply in modern business telephony. A VOIP provider buys blocks of DIDs from carriers and assigns them to customers, which is how a company can hand every employee their own direct number without buying a physical line for each one.
Because DIDs are frequently issued by VOIP providers rather than traditional carriers, a number that looks ordinary may be a DID sitting on an internet-based platform. That affects whether it can receive SMS, which is why line-type detection matters more than the number format.