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Overview

SHAKEN/STIR technology helps protect your business calls from being marked as spam or “Scam Likely” by verifying caller authenticity. Understanding and implementing proper caller verification protects your business reputation and ensures your calls reach customers successfully.
SHAKEN/STIR protection is available for US business numbers through OpenPhone’s Trust Center. Registration helps establish caller legitimacy with major carriers.
Please note that in addition to SHAKEN/STIR and the Free Caller Registry, we also help our customers not be labeled as spam by prohibiting the sort of practices that are seen as spammy. What this is means is it is against OpenPhone policy to cold call people you do not know in order to try and sell them something. Cold calling is not allowed on OpenPhone.

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Understanding call reputation issues

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Why numbers get flagged

Previous ownership impact: Phone numbers often carry reputation from previous owners, leading to inherited spam labels that don’t reflect your business practices. Common flagging triggers:
  • Previous owner’s calling patterns or complaints
  • Sudden spikes in outbound call volume
  • Consumer fraud or spam reports
  • Inconsistent calling behavior patterns
Phone number displaying as Scam Likely on recipient device

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Impact on business communications

Negative consequences:
  • Reduced call answer rates
  • Damaged business credibility
  • Lost customer opportunities
  • Decreased communication effectiveness

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Clearing spam labels for US numbers

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Free Caller Registry registration

Quick registration process: Access through OpenPhone’s Trust Center for streamlined registration that clears “Scam Likely” labels faster than traditional long-form processes.
Free Caller Registry short form interface
Registration requirements:
  1. Navigate to Settings → Trust Center in OpenPhone
  2. Complete Clear Scam Likely labeling section
  3. Provide accurate business information
  4. Submit registration to major US carriers

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Required information

Calling company details:
  • Business phone number: Your OpenPhone business number
  • Business name: Official registered business name
  • Business address: Physical business location
Service provider information:
  • Provider name: OpenPhone (your service provider)
  • Provider relationship: Business phone service

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Carrier distribution

Registry reaches major carriers:
  • T-Mobile
  • Verizon
  • Sprint
  • US Cellular
  • AT&T
  • Other participating carriers

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Clearing spam labels for Canadian numbers

Hiya spam detection removal:
  1. Visit Hiya support portal
  2. Complete spam removal form
  3. Provide business verification details
  4. Wait for processing and confirmation
US Carrier Registration benefits:
  • Also registers Canadian numbers with STIR/SHAKEN
  • Provides broader carrier recognition
  • Helps prevent future spam labeling
  • Complies with FCC fraud reduction protocols

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SHAKEN/STIR technology

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How SHAKEN/STIR works

Authentication process:
  • Originating carrier signs call with cryptographic signature
  • Call routing preserves authentication through network
  • Terminating carrier verifies signature authenticity
  • Display decision shows verified or unverified status
Verification levels:
  • A (Full): Complete verification of caller and number
  • B (Partial): Caller verified, number relationship uncertain
  • C (Gateway): Originating carrier cannot verify caller

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Business pathway requirements

STIR/SHAKEN through OpenPhone:
  • Available for business customers with tax ID
  • Requires US Carrier Registration completion
  • Provides enhanced call authentication
  • Reduces fraud and spam likelihood

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Comprehensive protection strategy

Step 1: FCC Registration Complete US Carrier Registration through OpenPhone Trust Center:
  • Provide business tax ID number
  • Submit business verification documents
  • Enable STIR/SHAKEN authentication
  • Maintain compliant calling practices
Step 2: Free Caller Registry Register business legitimacy with carriers:
  • Complete business information accurately
  • Verify ownership of phone numbers
  • Establish positive caller reputation
  • Monitor registration status

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Compliance best practices

Calling behavior guidelines:
  • Consistent patterns: Maintain regular calling volumes and schedules
  • Legal compliance: Follow all relevant laws and regulations
  • Terms adherence: Comply with OpenPhone Terms of Service
  • Consumer respect: Honor opt-out requests and preferences
Avoiding red flags:
  • Prevent sudden call volume spikes
  • Avoid aggressive calling patterns
  • Respond to consumer complaints promptly
  • Maintain accurate business information

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Ongoing maintenance

Reputation monitoring:
  • Regular check of number reputation status
  • Monitor customer feedback about call display
  • Address spam reports immediately
  • Update registration information when business changes
Proactive measures:
  • Annual registration renewal
  • Business information updates
  • Calling pattern optimization
  • Customer education about legitimate calls

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Troubleshooting spam labels

When customers report spam labels:
  • Verify registration status in Trust Center
  • Check compliance with calling guidelines
  • Submit removal requests through appropriate channels
  • Communicate with customers about verification process
Persistent labeling issues:
  • Contact OpenPhone support for escalation
  • Provide evidence of legitimate business operations
  • Document customer complaints and resolution efforts
  • Consider number replacement if severely compromised
Prevention strategies:
  • Implement call warming for new numbers
  • Educate customers about expecting calls
  • Use branded caller ID when available
  • Maintain consistent business communications

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Best practices summary

Essential registrations:
  • Complete US Carrier Registration in Trust Center
  • Submit Free Caller Registry business information
  • Enable STIR/SHAKEN authentication
  • Update business details when changed
  • Monitor registration status regularly
Compliance guidelines:
  • Maintain consistent calling patterns
  • Honor all legal requirements
  • Respect consumer preferences
  • Document legitimate business purpose
  • Respond to complaints promptly
Ongoing tasks:
  • Check number reputation monthly
  • Update registrations annually
  • Monitor customer feedback
  • Address labeling issues immediately
  • Keep business information current

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Additional resources

Need assistance? Submit a support request at support.openphone.com for help with spam label removal and caller verification.