DID Numbers

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DID Numbers

Direct inward dialing numbers (DIDs) are virtual numbers that allow you to route calls to your existing telephone lines. DIDs were developed in order to be able to assign certain employees a direct number, without requiring multiple physical phone lines. One DID number is able to route and process thousands of simultaneous calls to the proper extensions. With a DID number, a company can route calls to an unlimited amount of extensions, while only having to maintain one DID number.

What is required to have an active DID?

In order to have an active DID, all that is required is to have a working transfer line to which calls can be forwarded. That line could be a land line, cellphone, or PBX system.

How are DID numbers used with PBX systems?

In many cases, direct inward dialing is used in conjunction with a company’s private branch exchange (PBX) systems. The DID provider allocates one or more trunk lines to the customer’s PBX, allocates a range of telephone numbers to this line, and forwards all calls to such numbers via the trunk. When calls arrive at the PBX system, the dialed destination number is transmitted so that the PBX can route the call to the desired extension. As a consequence of this call forwarding, a company can offer individual phone numbers for each employee or work station without requiring a physical telephone line for each number.