A DID service is a Direct Inward Dialing (DID) phone service that allows phone calls to route directly to a phone or device without the need to dial an extension number. Multiple DID numbers can be routed to a single voice trunk and is used by businesses to provide a local direct inward dial number for voice service as well as other applications including video conferencing, fax, and dial-up. DID providers offer a number of handoff types including VOIP DID, ISDN PRI, and DID Trunks. DID service is also known as VOIP DIDPRI DIDLocal DIDDirect Inward Dial, or DID Trunks.

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