Contact Center

What is ANI? How automatic number identification works

9 min read

Updated on February 28, 2025

Published on February 28, 2025

Photo of call center agents working together at a work station

In the fast-paced world of contact centers, managing high call volumes while delivering exceptional customer service is no small feat. Agents often start calls with limited information, which can lead to longer handling times and customer frustration. This is where automatic number identification (ANI) makes a difference.

ANI identifies the caller’s phone number so that an agent doesn’t have to spend time trying to identify them. Instead, they can start the call with all the background information and customer history associated with that phone number. Contact centers use this information to identify callers, pull up relevant records, and route calls more efficiently, reducing wait times and enhancing the overall experience.

What is automatic number identification?

Automatic number identification is a telecommunications feature that automatically captures and transmits the phone number of an incoming caller to the recipient. While it’s often compared to caller ID, ANI is a more sophisticated technology that provides the phone number through the network signaling system — a more reliable method even in cases where caller ID might be blocked or unavailable.

ANI enables agents to access relevant customer data before answering the call. This helps reduce the time spent gathering basic information, allowing agents to focus on resolving the issue at hand more efficiently. Additionally, ANI is often used to route calls based on the caller’s location or previous interactions, creating a more personalized and seamless customer experience.

For businesses handling high call volumes, ANI provides insights that are helpful for streamlining workflows. It enables automated systems to verify caller identities, flag potential fraud, like spam and automated calls, and prioritize certain customers based on predefined criteria. These capabilities make ANI a practical choice for improving contact center efficiency and supporting better service delivery.

Illustration showcasing the difference in contact center processes with and without ANI functionalities

How does ANI work?

In contact centers, automatic number identification functions by capturing the caller’s phone number and transmitting it to the recipient via the telecommunication signaling system. 

When a call is placed, it doesn’t just travel directly from one phone to another. Behind the scenes, a signaling system handles the technical steps of routing the call through the network. It sends the caller’s phone number and other data through separate channels so the information reaches its destination even before the recipient answers the call.

This means the caller’s number is still available to the recipient’s network, even if caller ID is blocked.

Once received, ANI data is integrated with the contact center’s customer relationship management (CRM) or call management systems. This allows agents to instantly access customer profiles, transaction history, or other relevant details, reducing the time spent gathering basic information. Additionally, ANI is often paired with automated routing systems to direct calls to the appropriate department or agent based on predefined rules, such as geographic location, customer status, or previous interactions.

DNIS vs. ANI vs. caller ID

Although dialed number identification service (DNIS), ANI, and caller ID all deal with call-related information, they serve distinct purposes within the telecommunications and contact center ecosystem. Understanding these differences can help businesses determine how to utilize each feature best.

  • ANI: ANI transmits the incoming caller’s phone number to the recipient. It’s designed to provide reliable data directly through the signaling system, making it more accurate than caller ID. ANI data is primarily used in contact centers to identify callers, access customer records, and optimize call routing. Unlike caller ID, ANI information cannot be blocked by the caller.
  • DNIS: DNIS identifies the number the caller dialed to reach the contact center. This is especially useful for businesses with multiple phone numbers routed to the same call center, such as toll-free numbers for different product lines or services. DNIS enables call centers to tailor their responses based on the number dialed, ensuring the caller is directed to the correct department or service.
  • Caller ID: Caller ID is a more familiar feature for most users. It displays the caller’s number and, in some cases, the associated name on the recipient’s device. However, caller ID data can be manipulated or blocked by the caller, making it less reliable for verifying identities. While caller ID is a helpful feature for individual users, it lacks the robustness and integration capabilities that make ANI indispensable for contact centers.

Together, these tools can enhance contact center operations, but ANI and DNIS stand out for their utility in high-volume, professional environments.

What are the benefits of ANI for contact centers?

Automatic number identification offers several advantages that help contact centers improve efficiency, customer interactions, and overall operations. Here’s what ANI can help you do:

Illustration showcasing the different benefits of implementing ANI into contact center processes

A more personalized experience for customers

A personalized experience is just as important as excellent audio quality and a hiccup-free customer journey. Customers feel valued when agents know who they are and what they need, leading to a more positive impression of the business. 

Since ANI enables contact centers to recognize customers as soon as they call, agents can greet them by name and access relevant account or interaction histories immediately. This eliminates the need for repetitive questions, such as asking for account numbers or prior interactions, and creates a smoother and more personalized experience.

Faster customer identification

With ANI, agents no longer need to manually verify caller information, such as account numbers or other identifiers. The caller’s number is automatically matched with the contact center’s database, pulling up their records in real time. This not only saves time but also allows agents to focus on resolving issues more quickly. For high-volume call centers, this benefit can translate into shorter wait times and increased efficiency.

Improved call routing

ANI can be integrated with automated call distribution systems to route calls more effectively. For example, calls can be directed to specific departments or agents based on the caller’s location, account status, or previous interactions. This reduces misrouting and helps direct customers so that they’re connected to the right person the first time.

Better routing means fewer transfers, shorter call times, and higher first-call resolution rates, which are important for maintaining high customer satisfaction levels.

Enhanced fraud prevention

ANI provides an added layer of security by verifying the caller’s number. Contact centers can flag suspicious or unrecognized numbers, reducing the risk of fraud or unauthorized access. This capability is particularly valuable for businesses in industries that handle sensitive information, like finance or healthcare.

For example, if someone tries to use your information to make changes to your account through customer support, agents can flag the unrecognized phone number and try to confirm the caller’s identity. 

Enables agents to make personalized recommendations

Because ANI pulls up customer details immediately, agents can tailor their interactions to the caller’s needs. This includes making personalized product or service recommendations based on the customer’s history, preferences, or past inquiries.

For example, if a customer previously inquired about an upgrade, the agent can proactively suggest options during the call. These personalized recommendations not only enhance the customer experience but also open opportunities for upselling and cross-selling.

How to implement ANI technology

Adding automatic number identification to your contact center software is a straightforward process that starts with evaluating your current telephony system and contact center solutions. Many modern contact center platforms already support ANI functionality, either natively or through integrations. 

Check to see if your current provider offers ANI functionality. Otherwise, you’ll need to look into reliable and scalable service providers and compare functionalities to find the best fit for you. Once you’ve implemented ANI, you can connect it to your CRM system and call routing tools to unlock its full potential.

Take your customer experience to the next level with Zoom Contact Center

Ready to take your contact center to the next level with ANI? Zoom Contact Center offers robust ANI and call handling capabilities to help you streamline operations and elevate customer satisfaction. Reach out today to explore how our solutions can support your business goals and create a better customer experience.

Automatic number identification FAQ

Still have questions about automatic number identification? Here are answers to some of the most common queries to help you better understand how this technology works and its implications for your contact center.

What’s the difference between ANI and CLI?

ANI is a telecommunication feature primarily used by service providers to capture and transmit the caller’s phone number for billing and operational purposes. It provides reliable data that cannot be blocked by the caller. 

Calling line identification (CLI), otherwise known as caller ID, is a feature designed for end users, such as businesses or individuals, to display the caller’s number on their phone or device. CLI data can be manipulated or withheld by the caller, making it less reliable in some cases.

What is ANI screening?

ANI screening is a process that uses ANI data to identify and filter incoming calls based on predefined criteria. For example, businesses can use ANI screening to prioritize calls from premium customers, block known spam or fraudulent numbers, or route calls to specific departments based on the caller’s location.

Should I worry about data privacy and security with ANI?

While ANI provides valuable caller information, businesses must handle this data responsibly to protect customer privacy and comply with data protection regulations. 

Most reputable contact center software providers incorporate robust security measures, such as encryption and data access controls, to safeguard ANI data. However, it’s important for businesses to work with providers who prioritize compliance with privacy laws like GDPR or CCPA and implement internal policies that limit access to sensitive data.

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