Overview
If your legitimate outbound calls are displaying as "Spam," "Spam Likely," "Scam Likely," or similar warnings, answer rates and customer engagement can be significantly affected.
Spam labelling is determined independently by telephone carriers and third-party analytics providers using their own reputation models and fraud detection systems. Because every provider evaluates calls differently, there is no single configuration or registration that guarantees calls will never be labeled as spam.
This article explains how spam labelling works, the factors that influence caller reputation, and the practical steps organizations can take to reduce the likelihood of outbound calls being flagged.
Understanding How Spam Labeling Works
Spam labelling is designed to protect consumers from fraudulent, spoofed, and unwanted calls.
Rather than relying on a single indicator, carriers and analytics providers evaluate multiple signals simultaneously when determining whether a call should be trusted.
These signals typically include:
- Caller authentication
- Historical number reputation
- Calling behavior
- Consumer complaints
- Caller identification
- Regional carrier policies
Because each carrier uses its own proprietary algorithms, the same outbound call may be displayed differently depending on the recipient's network or device.
Common Factors That Influence Caller Reputation
Caller Authentication
Many carriers verify whether the originating provider is authorized to present the caller ID being used.
In North America, this is primarily achieved through the STIR/SHAKEN framework. Other regions may use different authentication mechanisms or carrier-specific validation processes.
Calls that cannot be confidently authenticated may receive a lower trust score.
Calling Behaviour
Carriers monitor outbound traffic for patterns commonly associated with robocalling or fraudulent activity.
Examples include:
- Sudden spikes in call volume
- Repeated calls to the same destination
- Extremely short call durations
- Low answer rates
- Large numbers of unanswered calls
Consumer Feedback
Recipient behaviour has a significant impact on caller reputation.
Calls that are repeatedly rejected, blocked, or reported through carrier systems or third-party applications may gradually lose trust over time.
Historical Number Reputation
Telephone numbers build a reputation throughout their lifecycle.
Most telephone numbers in the telecommunications industry are recycled and reassigned after a period of inactivity. While carriers generally follow established processes before returning numbers to service, historical reputation signals may persist across parts of the telecommunications ecosystem.
As a result, previous complaint history, calling patterns, or historical usage associated with a number may continue to influence how some receiving carriers or third-party caller identification and spam analytics providers evaluate incoming calls, even after the number has been assigned to a new owner.
This historical reputation is only one of many factors considered during call evaluation and does not necessarily indicate that the current owner has engaged in suspicious or fraudulent activity.
Caller Identification
Numbers that consistently present a recognizable business identity are generally considered more trustworthy than anonymous or inconsistent caller IDs.
Where supported, technologies such as CNAM, Branded Calling, or Verified Caller IDs (VCIDs) may improve caller recognition, although they do not prevent spam labeling.
Improving Your Caller Reputation
Reducing spam labeling requires both a strong caller identity and responsible calling practices.
Strengthen Your Caller Identity
Where available, organizations should:
- Use fully hosted or properly integrated telephone numbers.
- Configure supported caller identification services, such as CNAM or Branded Calling, when possible.
- Complete any caller authentication or messaging registration programs applicable to their region.
- Ensure outbound caller IDs accurately represent the business placing the calls.
North America: Register with Caller Reputation Services
Organizations operating in the United States and Canada should also consider registering their business and telephone numbers with recognized caller reputation services.
Examples include:
These services help participating carriers associate telephone numbers with legitimate businesses.
Maintain Healthy Calling Practices
Healthy calling practices are equally important for maintaining a positive caller reputation.
Recommended practices include:
- Avoid sudden spikes in outbound call volume.
- Distribute outbound traffic across multiple numbers where appropriate.
- Avoid repeatedly calling unanswered numbers within short periods.
- Regularly remove invalid, disconnected, or reassigned numbers from contact lists.
- Honour customer opt-out requests promptly.
- Monitor complaint rates and investigate unexpected increases.
Regional Considerations
Caller reputation mechanisms vary significantly around the world.
North America
Carriers commonly combine caller authentication(such as Stir/Shaken) analytics providers, reputation services, and consumer feedback when evaluating calls.
Organizations may also improve caller recognition by participating in available registration and reputation programs.
Other Regions
Outside North America, many carriers rely primarily on proprietary analytics, customer complaints, network-level fraud detection, and local regulatory requirements.
Unlike the United States, many countries do not offer centralized public reputation services where businesses can register their telephone numbers.
Organizations operating internationally should therefore focus on maintaining healthy calling practises, complying with local telecommunications regulations, and using supported caller identification technologies where available.
Understanding Talkdesk's Role
Talkdesk provides the platform used to originate your calls, but does not determine whether calls receive spam labels.
Spam labeling decisions are made independently by receiving carriers and third-party analytics providers.
Because of this, Talkdesk cannot:
- Remove spam labels assigned by carriers
- Override carrier reputation algorithms
- Modify third-party spam databases
- Guarantee that calls will never be labeled as spam
Need Additional Assistance?
If you continue experiencing widespread spam labeling after implementing these recommendations, please contact the Talkdesk Customer Care Team. Talkdesk will review the information you provide to determine whether the reported behavior may be related to your Talkdesk configuration. If no platform-related issues are identified, and the behavior appears to result from carrier or third-party spam analytics, Talkdesk cannot request the removal of spam labels or override those decisions.
To help expedite the investigation, please include:
- The affected telephone number(s)
- The destination country
- The destination carrier (if known)
- Example calls (Interaction IDs or calling number, called number, and the call timestamp (including time zone).
- Screenshots of the spam label, if available
- Any recent changes to your outbound configuration or calling patterns