This document provides information on the DID Exchange application programming interface (API) for buyers. It includes instructions for accessing API functions related to DID numbers, including viewing available DIDs, purchasing DIDs, listing purchased DIDs, and unsubscribing from purchased DIDs. 

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About Direct Inward Dialing (DID)

DID, or Direct Inward Dialing, is a telecom service that allows a caller to directly reach a specific extension or phone number within a company or organization. DID numbers are usually assigned to specific individuals or departments within an organization, and they are used to route calls to the appropriate extension or phone number.

DID numbers are often used in conjunction with a PBX (Private Branch Exchange) system, which is a private telephone network that is used within an organization to manage and route calls between extensions. DID numbers are typically used for incoming calls, while outbound calls are typically made using a separate set of numbers, such as trunk lines or access codes.

In the context of telecom, DID numbers are used to provide businesses and organizations with a way to manage and route incoming calls to the appropriate extension or phone number. They are a key component of many telecom systems, and they are often used to improve efficiency and customer service.