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Direct Inward Dialing (DID) is a communication technology designed to connect a set of external telephone numbers to a private branch exchange (PBX). Using DID technology, telephone numbers can be assigned dynamically throughout a company without additional external phone lines.
DID technology acts as a connection point between a limited number of rented external lines and many internal company phone numbers. Think of the technology as a highly adaptable telephone exchange that connects your PBX with the public telephone network.
For example, if a department within a company acquired additional staff, more phone lines could easily be assigned to the department using DID. Or let’s say a manager within your company moved to different physical areas in your company throughout the day; DID technology would allow you to quickly reroute the manager’s phone number to follow their movements.