DID Number
DID Number
Learn what DID numbers are, how they work with PBX and VoIP, and why businesses use them to improve call management, security, and global communication.
What Is a DID Number? How Direct Inward Dialing Works
A direct inward dialing (DID) number is an effective tool that allows businesses to route calls directly to specific extensions without going through a receptionist or an Interactive Voice Response (IVR) system.
DID numbers allow businesses to assign unique phone numbers to employees or departments without the need for separate physical phone lines. So whether you're running a global call center or a small customer support team, DID numbers streamline communication, improve customer experience, and reduce operational costs.
But here's where it gets even more helpful: DID numbers seamlessly integrate with Voice over Internet Protocol (VoIP) and Session Initiation Protocol (SIP) trunking, offering businesses greater flexibility, lower costs, and a streamlined communication system.
But how do they work and fit into the bigger picture of modern and global business communications? This guide has all the answers—so keep reading.
What are DID numbers?
DID numbers are cloud phone numbers that allow businesses to assign direct lines to employees or departments without requiring individual physical phone lines. This makes call management more efficient, reduces costs, and improves customer experience.
Some of the essential features of DID numbers include:
- Direct call routing: Calls bypass a central receptionist and go straight to the intended recipient.
- VoIP and SIP trunking compatibility: You can seamlessly integrate DID numbers with VoIP phone systems and SIP trunking, eliminating the need for traditional public switched telephone network (PSTN) lines.
- Local and toll-free number support: Businesses can assign local numbers in different regions or offer toll-free numbers for customer convenience.
- Flexible call forwarding: DID numbers allow users to route inbound calls to softphones, desk phones, mobile devices, or call queues based on business needs.
How do DID numbers work?
DID numbers act as a bridge, seamlessly connecting external callers to specific extensions within your business phone system to simplify call routing and enhance communication efficiency.
Here's a visual representation of how it all comes together:
DID numbers through PBX systems
A Private Branch Exchange (PBX) is a business phone system that manages incoming and outgoing calls, allowing companies to assign multiple DID numbers to different employees or departments.
The following shows how DID numbers integrate with PBX systems:
- When a caller dials a DID number, a business's PBX system receives it.
- The PBX automatically routes the call to the correct extension or queue.
- Employees receive calls directly, bypassing the need for a central receptionist or menu system.
Businesses can use two types of PBX systems with DID numbers. The first one is an on-premise PBX, which requires installing physical hardware at a company's location. On-premise PBX systems require physical phone lines and maintenance, which can make setup and ongoing operational costs expensive.
The second type of system is a cloud-based PBX system hosted by third-party providers that businesses can access over the internet. Cloud-based PBX offers greater scalability and flexibility, making it easier to add or remove DID numbers as your business grows.
DID numbers using VoIP and SIP trunking
VoIP enables businesses to use DID numbers without relying on traditional phone lines. Because VoIP transmits calls over the internet, it reduces costs and improves flexibility.
Below is how VoIP and DID numbers work together:
- Businesses purchase DID numbers from a VoIP provider.
- The VoIP system digitally routes calls over the internet instead of the PSTN.
- Employees can receive incoming calls on softphones, desk phones, or mobile devices.
Businesses often use SIP trunking to enhance VoIP functionality. The protocol enables multiple DID numbers to operate over a single internet connection, eliminating reliance on physical trunk lines. It enables seamless global communication, allowing businesses to maximize the benefits of SIP trunking.
Types of DID numbers
Below is a comparison of the most common types of DID numbers along with their benefits, drawbacks, and ideal use cases.
| Local DID numbers | Have ties to a specific geographic area, allowing businesses to establish a local presence | Establishes a local presence and builds trust with local customers | Limited to a specific region | Businesses targeting specific cities or regions |
| Toll-free DID numbers | Allow callers to reach your business without incurring long-distance charges | Enhances customer experience and encourages inbound calls | Can be more expensive than local DIDs | Businesses with a nationwide or international customer base |
| Mobile DID numbers | DID numbers that can work on mobile networks and allow SMS and voice capabilities | Enables remote work and provides flexibility | May require specific configurations | Businesses with remote or mobile employees |
| National DID numbers | Numbers work nationwide without ties to a specific local area code | Simplifies communication for businesses operating nationwide | May not provide the same local presence as local DIDs | Businesses with a national presence |
| Vanity DID numbers | Custom phone numbers that spell out words or brand names and are memorable (like 1-800-FLOWERS) | Enhances brand recognition and offers customers a number that’s easy to remember | Can be more expensive and harder to acquire | Businesses that prioritize branding and easy recall |
| Virtual DID numbers | Route calls over VoIP or PBX systems rather than relying on a physical location | Offers flexibility, scalability, and cost savings | Requires a reliable internet connection | Businesses looking for flexible and scalable communication solutions |
| Universal International Freephone Number (UIFN) | A toll-free number that callers can dial from multiple countries | Provides international reach and enhances customer experience | Can be expensive to set up and maintain | Businesses with a global customer base |
Benefits of using DID numbers for businesses
DID numbers offer a wealth of advantages for businesses of all sizes. Here are some of their main benefits:
- Improved customer experience: DID numbers allow customers to connect directly to the right person or department, which reduces wait times and frustration. This direct connection also enhances customer satisfaction and builds stronger relationships.
- Enhanced professionalism: Providing direct-dial numbers to employees presents a professional image to clients. It also demonstrates that your business follows a structure and values efficient communication.
- Increased efficiency: By bypassing a switchboard or auto-attendant, DID numbers streamline call routing and improve overall communication efficiency. This saves time and resources for both your employees and your customers.
- Cost savings: DID numbers, especially when working with VoIP and SIP trunking, can be more cost-effective than traditional phone lines. Businesses can streamline communication while lowering expenses by bypassing the need for multiple physical lines and its associated costs.
- Scalability and flexibility: Adding or removing DID numbers is easy and cost-effective, which makes them ideal for growing businesses. Whether you're adding new employees or expanding your operations, DIDs can easily scale to meet your needs.
- Enhanced call management: Many VoIP and PBX systems offer advanced call management features that work seamlessly with DID numbers. These features can include call forwarding, voicemail, call queuing, and more, providing greater control over your communications.
Security and compliance for DID numbers
Protecting your DID numbers from fraud and making sure you meet regulatory requirements is crucial for maintaining business integrity and avoiding legal issues. The following demonstrates how to do it effectively:
Potential risks and how to protect your DID number
One common issue is toll fraud, where unauthorized individuals use your DID number to make long-distance calls, racking up hefty charges. Another risk is VoIP security breaches, which can compromise your entire communication system.
Here are some measures to protect your DID numbers:
- Strong passwords: Use strong, unique passwords for your VoIP accounts and PBX systems.
- Caller ID spoofing prevention: Prevent hackers from manipulating VoIP systems to impersonate businesses by implementing STIR/SHAKEN protocols and using trusted SIP trunking providers to validate caller identities.
- Regular updates: Keep your VoIP software and PBX systems up to date with the latest security patches.
- Firewall protection: Implement firewalls to protect your network from unauthorized access.
- Call monitoring: Monitor your call logs for any suspicious activity.
- Fraud prevention: Implement call restrictions, such as limiting international calls or setting spending limits.
- Two-factor authentication: Enable two-factor authentication for added security.
- Secure VoIP provider: Look for providers that offer encryption, multi-factor authentication, firewall protection, and compliance with industry regulations like the Health Insurance Portability and Accountability Act (HIPAA) and General Data Protection Regulation (GDPR).
Regulatory requirements by region
Some countries require businesses to provide proof of identity and address when registering DID numbers to prevent fraud and ensure accountability.
For example, if you want to get a US-based phone number for your international business, you must comply with relevant regulations, such as HIPAA or the California Consumer Privacy Act (CCPA).
Below is a quick guide to some DID number verification requirements in different countries:
| United States | Proof of business identity is mandatory for DID number registration. |
| United Kingdom | Businesses may need to provide a local address for certain DID number types. |
| Germany | Local presence verification is necessary, and businesses must have a registered office in Germany. |
| Australia | Some DID numbers require proof of business registration and address verification. |
| Brazil | Government-issued documentation and tax IDs are necessary for businesses acquiring DID numbers. |
How to get a DID number (step by step)
Getting a DID number is a straightforward process, especially when you choose the right provider. Here's a step-by-step guide to help you get started:
Step 1: Choose a service provider
The first step is to select a reputable VoIP or telecommunications provider that offers DID number services. Consider factors like pricing, features, scalability, and customer support.
For businesses seeking global coverage, advanced call management features, and reliable service, AVOXI is a top choice. With a wide selection of DID numbers and seamless VoIP integration, AVOXI makes it easy to scale your communications as your business grows.
Step 2: Set up and configure your DID number
Once you've chosen a provider, you'll need to select the type of DID number you need (local DID or toll-free numbers) and pick a plan.
After selecting your DID number and plan, your provider will guide you through the setup and configuration process, which typically involves setting up your VoIP account or connecting your PBX system to their network. You may also need to configure call routing, voicemail, and other features.
Step 3: Check compliance and regulatory requirements
Before you start using your DID number, you’ll need to ensure that you comply with all applicable regulations in your target regions. As outlined above, some countries have specific DID number registration and usage requirements. Make sure you understand and meet these requirements to avoid any legal issues.
Why choose AVOXI as your DID number provider?
DID numbers have become a critical tool for businesses looking to improve customer communication, call management, and global reach. From assigning direct extensions for employees to reducing the cost of international calls, the advantages of DID numbers are clear.
Whether you're integrating DID numbers with a PBX system, VoIP, or SIP trunking, they provide a scalable, flexible, and efficient way to streamline business communications.
When selecting a DID number provider, reliability, security, and global coverage are key considerations. Fortunately, AVOXI understands that well and offers the following benefits for DID numbers:
- Global coverage: Access local, toll-free, mobile, national, and vanity DID numbers in over 150 countries.
- Seamless integrations: Easily connect with PBX systems, VoIP platforms, and customer relationship management (CRM) tools for smooth communication.
- Advanced call management: Features like call forwarding, IVR, call recording, and analytics can help optimize customer interactions.
- Compliance and security: AVOXI guarantees adherence to local regulations and industry security standards to protect your business.
- Flexible and scalable solutions: Whether you're a small business or an enterprise, AVOXI's cloud-based approach grows right along with you.
If you're looking for a dependable, feature-rich DID number solution, AVOXI makes the process simple, secure, and cost-effective. Learn more about AVOXI's DID number services to see how they fit into your business, or contact us today to get started with a DID number.
Additional Resources
PSTN Replacement
Guide to Voice Termination Services
Retain Phone Number
International
Number Porting
Virtual Phone Line
Benefits of
SIP Trunking
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