What Is STIR/SHAKEN Compliance and Why Is It Important?

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Businesses today depend heavily on voice communication, but trust in phone calls has declined dramatically over the last few years. Spam calls, robocalls, and caller ID spoofing have made customers hesitant to answer unknown numbers. This growing telecom problem is exactly why STIR/SHAKEN compliance has become essential for modern VoIP providers, SIP carriers, contact centers, and enterprise communication systems.

STIR/SHAKEN is designed to verify caller identity, reduce spoofed calls, and help telecom providers restore trust in voice communication. As regulations tighten and carriers become stricter about spam prevention, businesses that ignore STIR/SHAKEN compliance may face lower answer rates, spam labeling, and reduced call deliverability.

If your company uses VoIP services or outbound calling systems, understanding how STIR/SHAKEN works is no longer optional.

You can also learn more about modern communication infrastructure in our guide on
https://thevoipedia.com/cloud-pbx-vs-traditional-phone-systems/

What Is STIR/SHAKEN Compliance?

STIR/SHAKEN is a caller authentication framework used to verify that a phone call is genuinely coming from the number displayed on caller ID.

The framework combines two telecom standards:

  • STIR — Secure Telephone Identity Revisited
  • SHAKEN — Signature-based Handling of Asserted Information Using toKENs

Together, these standards help telecom providers digitally sign and verify calls across IP-based VoIP networks.

The Federal Communications Commission (FCC) introduced STIR/SHAKEN as part of its broader effort to reduce illegal robocalls and caller ID spoofing.
https://www.fcc.gov/call-authentication

Why STIR/SHAKEN Was Introduced

Before STIR/SHAKEN, scammers could easily manipulate caller IDs using VoIP systems. Fraudsters often impersonated:

  • Banks
  • Government agencies
  • Healthcare providers
  • Insurance companies
  • Customer support teams

As spoofing became more common, customers stopped trusting incoming calls. Even legitimate businesses began struggling with declining answer rates.

Telecom providers and regulators needed a scalable solution that could authenticate caller identity across modern SIP networks. STIR/SHAKEN was created to solve this growing issue.

Businesses using scalable communication platforms like modern cloud PBX systems are increasingly adopting authentication frameworks to improve call trust and delivery.
https://thevoipedia.com/global-voip-solutions-businesses/

How STIR/SHAKEN Works

The STIR/SHAKEN framework works through digital certificates and SIP authentication.

Here’s a simplified process:

  1. A VoIP call is initiated.
  2. The originating provider verifies the customer.
  3. The provider digitally signs the call.
  4. A SIP Identity header and PASSporT token are attached.
  5. The receiving carrier verifies the signature.
  6. The call receives a trust verification level.

This entire process happens in milliseconds without affecting audio quality or call performance.

Understanding STIR/SHAKEN Attestation Levels

One of the most important aspects of STIR/SHAKEN compliance is attestation.

Attestation levels indicate how confidently the originating provider can verify the caller identity.

Full Attestation (A-Level)

The provider:

  • Knows the customer
  • Authenticated the customer
  • Confirms ownership of the phone number

This is the highest trust level.

Partial Attestation (B-Level)

The provider knows the customer but cannot fully verify ownership of the caller ID number.

Gateway Attestation (C-Level)

The provider received the call from another network and cannot verify the original caller.

Calls with lower attestation levels are more likely to trigger spam analytics systems.

More technical details about STIR/SHAKEN standards can be found here:
https://sti-ga.atis.org/

Why STIR/SHAKEN Compliance Is Important

Better Call Answer Rates

One of the biggest benefits of STIR/SHAKEN compliance is improved call answer rates.

Modern carriers increasingly prioritize authenticated traffic. Calls without verification are more likely to:

  • Display “Spam Likely”
  • Be blocked
  • Receive lower trust scores
  • Experience poor connection rates

For outbound sales teams and call centers, this directly impacts campaign performance and revenue generation.

Caller ID Spoofing Prevention

Caller ID spoofing damages customer trust and brand reputation.

STIR/SHAKEN helps telecom providers reduce fraudulent impersonation attempts and improve the credibility of legitimate business calls.

Regulatory Compliance

In the United States, the FCC requires many voice service providers to implement STIR/SHAKEN on IP-based networks as part of robocall mitigation requirements.

Failure to comply can create operational and regulatory risks for telecom providers and VoIP businesses.

Additional information about telecom identity frameworks can be found here:
https://www.iconectiv.com/stir-shaken

Improved Carrier Reputation

Carriers constantly analyze traffic quality.

Businesses sending authenticated traffic often experience:

  • Better routing quality
  • Improved termination rates
  • Lower spam labeling
  • Stronger carrier relationships

This is especially important for companies operating large outbound call campaigns.

Why Call Centers Need STIR/SHAKEN

Modern contact centers rely heavily on outbound communication.

Without caller authentication, even legitimate business calls may appear suspicious to recipients. This results in:

  • Lower pickup rates
  • Reduced agent productivity
  • Increased spam labeling
  • Poor campaign performance

STIR/SHAKEN compliance helps contact centers maintain trusted outbound communication while improving answer rates.

Common Challenges with STIR/SHAKEN

Legacy Infrastructure

Older telecom systems based on TDM or SS7 networks may face interoperability challenges when integrating STIR/SHAKEN.

International Traffic

Cross-border authentication remains complex because countries implement different telecom verification standards.

Spam Analytics Still Matter

Even authenticated calls can still be flagged if dialing behavior appears suspicious.

Carriers also evaluate:

  • Complaint rates
  • Call frequency
  • Traffic patterns
  • Consumer feedback

This means businesses must combine authentication with responsible outbound practices.

Does STIR/SHAKEN Stop All Robocalls?

No.

STIR/SHAKEN significantly reduces caller ID spoofing, but it does not eliminate all robocalls.

Scammers may still:

  • Use valid phone numbers
  • Exploit compromised systems
  • Route traffic internationally
  • Abuse non-IP networks

However, STIR/SHAKEN remains one of the most important telecom security improvements introduced in recent years.

Best Practices for STIR/SHAKEN Compliance

Businesses can improve their telecom reputation by:

  • Using verified caller IDs
  • Maintaining compliant dialing practices
  • Monitoring spam analytics
  • Working with trusted SIP carriers
  • Registering outbound campaigns
  • Avoiding aggressive robocall behavior

The Future of STIR/SHAKEN

The telecom industry continues evolving toward stronger caller verification systems.

Future developments may include:

  • Verified branded calling
  • Rich call data
  • AI-driven fraud prevention
  • Enhanced cross-border authentication
  • Advanced telecom identity frameworks

The long-term goal is clear: restore trust in voice communication.

Final Thoughts

STIR/SHAKEN compliance has become a critical part of modern VoIP infrastructure.

As robocalls and caller ID spoofing continue affecting the telecom industry, businesses must prioritize authenticated voice communication to maintain answer rates, customer trust, and carrier reputation.

For VoIP providers, SIP trunk operators, cloud PBX platforms, and enterprise contact centers, STIR/SHAKEN is no longer just a regulatory requirement — it is becoming a business necessity.