Why Business Calls Get Labeled as Spam: Understanding Caller ID & Spam Tags

Recentcom Team

Oct 6

8 min read

We have all seen the “Spam Likely”, “Spam Risk”, and "Potential Spam" labels. These tags instantly create doubt and most people won't answer that call.

Unfortunately, these caller ID tags aren’t limited to robocalls or bad actors, rather legitimate businesses can find their phone numbers showing up as spam.

For small and midsized businesses and nonprofit organizations that rely on outbound phone calls to connect with customers, confirm appointments, follow up on inquiries, provide services, collect payments, or generate revenue, having calls labeled as Spam creates a very real business challenge. If people don’t answer the phone, important conversations don’t happen.

Person in a business suit holding a cell phone with a SPAM alert and Unknown call popping up.

Why Are Legitimate Business Calls Being Labeled “Spam”?

There isn’t a single setting, registration, or verification process that guarantees business phone numbers will never be labeled as Spam. Wireless carriers like AT&T, Verizon Wireless, and T-Mobile use a variety of signals including calling patterns, recipient feedback, and number history to determine how calls are displayed. And because it's up to the caller's provider to display the name of the incoming call, there's a chance legitimate businesses and associated phone numbers are getting tagged inaccurately.

As carriers continue working to protect consumers from unwanted calls, businesses also need to take steps to protect the reputation of their telephone numbers.

Understanding why business numbers get labeled, how caller ID reputation works, and what you can do about it is an important first step.

Carrier and call analytics systems look at patterns in calling behavior and recipient response. Some of those same patterns can be associated with unwanted or fraudulent calls, even when a legitimate business happens to use them.

Factors that may contribute to how a number is evaluated include:

Call volume and frequency
Answer rates
Short or abandoned calls
Repeated calls to the same number
Consumer complaints, blocks, and other feedback
Calling patterns and timing
Number history and reputation
Whether a number is newly assigned or has an established calling history

For example, a legitimate organization may make a large number of short outbound calls as part of appointment reminders, customer service, notifications, or other routine business activity. Those calls may look very different from robocalls to the business making them, but certain patterns can look similar to analytics systems evaluating calls at scale.

The system is looking at calling behavior and recipient response, not simply whether your business is legitimate.

What Do STIR/SHAKEN and Caller ID Verification Actually Do?

You may have heard about STIR/SHAKEN, the caller ID authentication framework designed to help combat illegal caller ID spoofing.

STIR/SHAKEN helps establish that the caller is authorized to use the telephone number being presented. That is an important part of establishing trust and reducing spoofing.

But authentication and spam labeling are not the same thing.

A properly authenticated call can still receive a spam label because carriers use additional information when evaluating calls. Verizon, for example, states that caller ID authentication is one of several factors its algorithm provider considers when determining how calls are categorized.

The same principle applies to business registration and reputation services. Registering a number can help establish that it belongs to a legitimate business, but it does not create a permanent whitelist that overrides a carrier's decision.

There is no universal whitelist that guarantees a business number will never be labeled “Spam,” “Spam Likely,” or “Potential Spam". That distinction is important because businesses should view caller ID verification as one part of a broader strategy, rather than a guarantee against spam labeling.

Why Is Caller ID Spam Labeling Becoming More Important?

Consumers are under constant pressure from unwanted and fraudulent calls, and carriers continue to adjust their systems in response.

The Federal Trade Commission received more than 2.6 million Do Not Call complaints during fiscal year 2025. The FTC also reported more than 258 million active registrations on the National Do Not Call Registry. That volume of unwanted-call activity creates pressure for carriers and analytics providers to identify potentially unwanted traffic.

When carriers adjust their models or thresholds, calling behavior that previously fell within an acceptable range may be treated differently. In other words, a business does not necessarily have to change its calling behavior for its spam label risk to change.

New Business Phone Numbers & Spam Tags

One situation businesses should pay particular attention to is the use of newly assigned phone numbers. A new business phone number does not necessarily have a bad reputation. The issue is that it may have no reputation yet.

Carrier analytics systems can use calling history and recipient response as signals. A brand new number or a number that has little or no history to work from may fall into inacurate Spam tags simply due to lack of use. Current industry guidance notes that newly assigned numbers can be more susceptible to incorrect spam labeling, particularly during their first calls or when they immediately begin making higher volumes of outbound calls.

This is particularly important when:

Moving to a new VoIP system
Adding new employees
Assigning new Direct Inward Dialing (DID) numbers
Expanding an outbound calling team
Replacing existing business numbers
Creating new numbers for departments or locations

For that reason, businesses should think carefully before automatically replacing established business numbers with brand-new ones.

When practical, retaining and porting established business numbers can help preserve valuable calling history rather than starting over with numbers that have no established reputation.

New Number Best Practices: Build Reputation Gradually

If you do need to assign a new business phone number for outbound calling, don't treat it like a number that has years of calling history.

There is no universal “7-day,” “14-day,” or “30-day” warm-up formula that guarantees a new number will avoid spam labels. Carriers do not publish a magic number of calls that makes a phone number “safe.”

Instead, the goal should be to establish normal, consistent, legitimate calling activity over time.

Here are some best practices to build a phone number's reputation:

1. Register Your Business Numbers

Register your business and outbound telephone numbers with reputable call analytics and reputation services where appropriate. Registering with carriers that are showing Spam tags is a good idea.

See a list of carriers and contact information to begin registering business telephone numbers to reduce Spam tags.

AT&T:

Call: 800-337-5373
Email: dl-GFMOBusinessFra@ATT.com

CenturyLink:

Email: robocall.reporting@centurylink.com

Comcast Xfinity:

Contact via website: xfinity.com/support/articles/report-call-blocking-errors
Call: 844-963-0215

First Orion:

Contact via website: calltransparency.com.

Frontier:

Email: nospam@ftr.com

Hiya:

Contact via website: https://hiyahelp.zendesk.com/hc/p/request_hub.
Hiya provides a service for legitimate businesses to register, through connect.hiya.com.

NoMoRobo:

Contact via website: nomorobo.com/contact and choose “Report a Number.” Nomorobo has a white list feature to which subscribers can add numbers in order to prevent erroneous blocking.
Email: reports@nomorobo.com

Sprint:

Call: 888-211-4727

T-Mobile:

Contact via website: https://callreporting.t-mobile.com/

US Cellular:

Call: 888-944-9400
Contact via website: uscellular.com/support/robocall/index.html

Verizon:

Contact via website: voicespamfeedback.com/vsf/

Windstream:

Call: 800-347-1991
Contact via Website: windstream.com/contact-us

YouMail:

Email: TNissues@youmail.com

NOTE: Registration is an important step, but it does not guarantee that a number will never receive a spam label from the receiving party's provider.

2. Make Sure Caller ID and STIR/SHAKEN Are Configured Correctly

Your outbound caller ID should accurately identify your business.

Work with your telecommunications provider to make sure:

Caller ID information is accurate and recognizable
Your business name is configured appropriately (Caller ID is limited to 15 characters including spaces)
STIR/SHAKEN authentication is being handled correctly
Your outbound numbers are properly associated with your organization

These identity signals can help establish that your calls are coming from an authorized business.

3. Start New Numbers With Normal Calling Activity

Avoid putting a brand-new number immediately into unusually high-volume outbound calling when possible.

There is no magic daily call count to follow. Instead, think gradual and organic rather than artificial. A new number should establish a legitimate calling history through normal business activity rather than immediately behaving like a high-volume outbound campaign.

4. Prioritize Calls People Expect

When possible, early calls from a new number should be calls that recipients are reasonably expecting.

Examples might include:

Existing customer callbacks
Appointment reminders
Customer support calls
Vendor communications
Service updates
Employee or internal business calls

Unexpected or unwanted calls are more likely to generate negative recipient feedback, which can affect caller reputation and Spam tags. Current industry guidance emphasizes recipient response, including blocking and spam reports, as an important reputation signal.

5. Avoid Calling Patterns That Can Look Suspicious

Certain calling patterns can increase the likelihood that legitimate calls will resemble unwanted calling activity.

Businesses should be mindful of:

Sudden spikes in call volume
Large numbers of very short calls
High unanswered or abandoned call rates
Repeated calls to the same destination
Calling at unusual hours
Frequently changing outbound numbers

Carriers and analytics providers do not publish a single formula for how these factors are weighted. A particular behavior does not automatically mean a call will be labeled as spam. The goal is simply to avoid patterns that may unnecessarily resemble the behavior of unwanted or fraudulent callers.

6. Build Reputation Rather Than Rotate Numbers

If one number develops a spam reputation, replacing it with a new number may seem like an easy solution. Unfortunately, it may not solve the underlying problem.

Continuously rotating numbers can mean repeatedly introducing numbers with little or no calling history. Instead, businesses should focus on understanding why a number is being labeled and correcting the underlying issue when possible.

NOTE: A stable business number with legitimate calling history can be more valuable than constantly starting over with a new number.

7. Monitor Your Phone Numbers

Don't wait for customers to tell you they aren't answering your calls. Periodically test your outbound numbers across different mobile carriers and devices.

Pay attention to whether calls display as:

Spam
Spam Likely
Spam Risk
Potential Spam
Potential Fraud
Another carrier-specific warning

Call labels can vary depending on the carrier, device, analytics provider, and circumstances surrounding the call. A number may not display the same way everywhere.

Monitoring gives businesses an opportunity to identify a problem before it becomes a widespread customer communication issue.

NOTE: Caller ID name is displayed by the receiving party's phone provider.

8. Remediate Instead of Immediately Replacing the Number

If a legitimate business number is incorrectly labeled, don't assume the only solution is to abandon the number.

Start by reviewing:

Calling volume and patterns
Recipient complaints or blocks
Caller ID configuration
STIR/SHAKEN authentication
Number registration
Recent changes to the way the number is being used

Depending on the carrier or analytics provider, businesses may also be able to submit a request to review an incorrect call label. Verizon, for example, provides a process for businesses to report calls that they believe have been incorrectly categorized or labeled, while noting that a submission does not guarantee a change in future labeling.

What If Your Business Is Switching to VoIP?

If you're moving from a traditional phone system and POTS or PRI phone line services to cloud communications and VoIP, you will have the option to port existing numbers or acquire and assign new numbers.

For many businesses, keeping established phone numbers makes sense for more than just customer recognition. Those numbers may also have years of legitimate calling history associated with them.

That doesn't mean an established number can never receive a spam label. It simply means you are not starting from zero.

If new numbers are necessary, plan for them accordingly. Register them, configure caller ID and authentication correctly, introduce them gradually, and monitor how they are being displayed.

A thoughtful number strategy should be part of the communications planning process rather than an afterthought.

Recommendations for Reducing Spam Labels

At Recent Communications, we believe businesses should take a proactive approach to caller ID reputation.

While no telecommunications provider can guarantee that a carrier will never label a legitimate call as spam, businesses can take practical steps to put their numbers in the strongest possible position.

Our recommendations are straightforward:

Keep established business numbers when practical
Register business numbers with appropriate reputation and analytics providers
Make sure caller ID information is accurate and recognizable
Confirm that STIR/SHAKEN is configured correctly
Introduce new numbers gradually rather than immediately using them for high-volume outbound calling
Prioritize calls recipients expect and want to receive
Avoid sudden volume spikes and other calling patterns that may resemble unwanted traffic
Monitor business numbers across different carriers and devices
Investigate and remediate incorrect spam labels rather than automatically replacing the number

The goal isn't to find a way around carrier spam detection. The goal is to establish a legitimate business identity, maintain responsible calling practices, and build a healthy calling reputation over time.

About Recent Communications, Inc.

Trusted for over 25 years, Recent Communications, Inc. is a regionally-based, 2^nd generation business communications company dedicated to designing and supporting reliable, secure, and flexible business phone solutions.

Our client-focused and consultative approach pairs industry expertise with white-glove service offering custom solutions, on-site implementation, and tailored training programs. Our responsive, expert support and a partnership-first mindset is key to client loyalty and lasting relationships.