A Comprehensive Guide to DDI Numbers

Efficiently reach the desired contact by bypassing unnecessary indirect calls. Select your Direct Dial-In (DDI) numbers or a group of DDIs for your employees and connect to our Cloud-based Voice over Internet Protocol (VoIP) system.

With Direct-Dial-In (DDI) or Direct-Inward-Dialling (DID), businesses can establish a virtual telephone number that eliminates the need for the main reception line and connects directly to a specific extension or location within the company. From the customer’s perspective, the direct dial number appears as a standard telephone number.

The most efficient way to manage this call routing is through a Voice over Internet Protocol (VoIP) telephone system. This system uses virtual connections via broadband rather than physical connections. The advantage of using VoIP for direct dialling is its scalability and cost-effectiveness. It’s important to note that some telecom providers may charge a monthly fee for this feature, so it’s important to check with the provider.

In this guide, we will describe a DDI number, how it works and its benefits for your business. 

What Is A DDI Number?  

Direct-Dial-In (DDI) numbers allow callers to connect directly to a specific extension without speaking to a switchboard or through an automated menu.

DDI numbers often fall within a range connected to the company’s primary number.

How Do DDI Numbers Work? 

You can ask your VoIP provider to issue various DDI numbers and any primary numbers you require while setting up your business phone system. Normally, you will be given a list of DDIs following your primary phone number format.

For instance, if your primary phone number is 01202 331000, you might request a list of 20 direct dial-in numbers. As a result, your supplier would supply a range like this:

  • 01202 331001
  • 01202 331002
  • 01202 331003
  • 01202 331004
  • 01202 331005
  • 01202 331006
  • 01202 331008
  • 01202 331009
  • And so on 

You may give clients and other callers a direct line to the people they want to speak with by programming each of those numbers to go to a particular individual or group of people.

VoIp also has a do not disturb feature; if any of your employees turn on this feature, their status is marked as busy. If you are doing an important task, you can turn your phone on DND so that anyone dialling your DDI number can see your status and not disturb you.

What Is The Difference Between DDI and DID Numbers? 

There is no distinction between Direct-Dial-In (DDI) and Direct-Inward numbers (DIDs). The name DID more frequently used outside of Europe, but DDI is more frequently used within it.

Benefits Of DDI Numbers 

There are several advantages to using DDI phone numbers in your company, but remember that not every user needs access to them. You could provide each sales team member with a DDI number so that clients can contact them simply, but you may decide against doing the same for other departments and teams.

Cost Savings

By utilising DDI numbers, you may facilitate quicker communication between team members, clients, and employees. You make it unnecessary for people to initially speak to a switchboard operator or receptionist, which results in reduced waiting time and more conversational time.

Customised Phone Numbers

DID numbers are not restricted to a certain range. While this is how they were issued in the past, modern VoIP phone systems do not operate this way. Every town, city, and nation can provide you and your team with DDI numbers. This adaptability enables you to project a local vibe to clients regardless of where your office is.

Better Customer Experience

Sales and relationships can suffer when customers are kept on hold or shuffled between team members. If they are paying for a service, nobody wants to wait around. By introducing this, you give your most important clients immediate access to your team, reducing the time they wait and become impatient. 

They can phone the member of your team’s DID number and speak with them directly or leave a message if they need to speak with them right away. Hunt groups, call forwarding, and voicemail can all be used in situations where the recipient may not be present.


With this and a VoIP solution, you may send incoming calls to customers’ mobile phones, desktop softphones, or handsets, giving you the greatest flexibility possible. When a client phones a coworker’s DDI while away from the office, their mobile VoIP system app will ring, and they can answer the call exactly like they would if they were in the office. Flexible working is made possible by this kind of flexibility, enhancing productivity and the customer experience.

Increased Productivity 

Implementing DDIs reduces the need for colleagues to transfer calls because incoming calls always reach the right person. Customers and coworkers get where they need to go promptly and can concentrate on their business rather than waiting.

Time Saving 

Time can be saved by routing calls to the individual directly rather than through a receptionist or phone menu. Follow-up is simpler when a customer can access a single number to contact them directly.


A Direct Dial-In (DDI) number, often called a Direct Inward Dialling (DID) number, enables callers to connect directly to a particular extension within a business without speaking to a switchboard or using an automated menu. It is accomplished by issuing a number range tied to the business’s main number.

A Voice over Internet Protocol (VoIP) telephone system manages these numbers. Cost savings, personalised phone numbers, and improved customer service for clients by giving them quick access to the team are all advantages of having DDI numbers. Both DDI and DID numbers serve the same purpose and are interchangeable.


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