DID Numbers: All The Stats, Facts And Data You’ll Ever Need To Know

DID stands for Direct Inward Dialing. This is a service that local phone companies offer to block of telephone numbers to call into one company. Companies will in normal circumstances have PBX, Private Branch Exchange systems. Using DID numbers, any company manages to offer customer phone numbers for every person or workstation within the company without necessarily requiring physical lines into PBX for every single connection. DID numbers can also be used for voice mail and fax and the live voice connections. They come with cost effectiveness compared to the regular PBX services.

The Background Of DID

Most companies and businesses have several incoming telephone numbers for different purposes. They can be for sales and customer service among others. To keep up with the demands, each user in the company requires an individual telephone number within the system. With so many telephone numbers, it is not practical to have different wire pairs. Direct inward dialing systems were created to reuse limited numbers of the physical phone lines to make it easier to handle calls to different published numbers. The phone service provider uses DID signaling to make it easy to identify the numbers waiting to be connected to PBX. Digital methods are now in place to make this easier to do even though most companies still work with PBX systems.

DID and VOIP numbers

Phone services can also be offered over broadband which is where the VOIP numbers come into the picture. In the new VOIP world, DID numbers are still saving the day for many businesses. Phone service providers offering the service over IP addresses will need to purchase DID numbers. Local telephone numbers and virtual phone numbers thereby still make use of DID which is much more effective.

The Benefits of DID Numbers

The most prominent DID benefit is that any person gets a chance to call a phone number or extension to connect to recipients without the need to go through an operator or a switchboard.

The company also enjoys the benefit of not having to purchase phone lines that are bulk in the name of handling all incoming calls. They have eliminated the need to have multiple physical lines for phones.

One DID number can route and process thousands of calls simultaneously to the right extensions. This is something that was not possible to enjoy before. Unlimited number of extensions within a company can have calls routed maintaining only one DID number.


To have a DID number that is active, you are required to have a working transfer line. The transfer line is where the incoming calls will be forwarded to. Different companies are now offering the technology and the phone line used can be a cell phone number, virtual phone number or a landline depending on the preferences. The numbers have undoubtedly made work easier for all companies in terms of cost and customer service improvements.

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