If you run a VoIP network, robocalls are a business liability, not just a nuisance. Since 2020, regulators have tightened enforcement, and in 2025 over 1,200 voice service providers were removed from US networks for non-compliance.

For STIR/SHAKEN compliance VoIP operators, maintaining trust in voice traffic is now mandatory. It determines whether your calls are verified or flagged as spam. Non-compliance can lead to blocked calls or removal from the Robocall Mitigation Database (RMD), preventing other carriers from accepting your traffic.

This article explains how call authentication VoIP works, what STIR/SHAKEN for telecom providers requires, and how to follow a practical STIR/SHAKEN implementation guide without disrupting your existing architecture.

What Is STIR/SHAKEN? A Simple Explanation for Telecom Providers

STIR/SHAKEN for telecom providers is a caller ID authentication framework designed to reduce spoofing and improve trust in voice networks.

STIR/SHAKEN stands for Secure Telephone Identity Revisited (STIR) and Signature-based Handling of Asserted Information Using toKENs (SHAKEN). While the terminology is complex, the concept is simple.

When a call originates on your network, your system applies VoIP caller ID authentication by signing the caller ID with a cryptographic token called a PASSporT. This token travels across interconnected networks until it reaches the terminating carrier, which validates it. The result determines whether the call is shown as verified, unverified, or spam.

Attestation levels:

  • Attestation (Full): The provider fully verifies both the subscriber and the phone number. This represents the highest trust level in call authentication VoIP.
  • Attestation (Partial): The provider verifies the subscriber but cannot fully confirm number assignment (common in enterprise trunks).
  • Attestation (Gateway): The provider only verifies the source network, not the subscriber identity (typically gateway traffic).

These attestation levels form the foundation of robocall compliance for operators, helping downstream carriers decide how to treat incoming calls.

According to a report, 85% of all voice traffic between Tier-1 carriers was signed and verified using STIR/SHAKEN protocols in 2025, with 93% at A-level attestation.

Current Compliance Requirements: What VoIP Operators Must Have in Place

The FCC has rolled out STIR/SHAKEN for telecom providers through phased compliance requirements across the industry. Non-facilities-based providers, VoIP resellers, and MSPs routing calls are expected to comply, along with gateway and intermediate providers. Today, compliance is a baseline requirement, and any non-compliant operator is considered out of alignment with current regulatory standards.

Here is what every operator in the US call chain must maintain for robocall compliance for operators:

Key requirements:

  • Robocall Mitigation Database (RMD) certification: Every provider must maintain an active RMD filing and robocall mitigation plan. Providers not listed in the RMD cannot have their traffic legally accepted downstream.
  • Own SPC token and digital certificate (effective September 18, 2025): Providers must sign calls using their own SPC token and certificate. While third-party platforms can assist, attestation responsibility and certificates must remain tied to the operator for proper VoIP caller ID authentication.
  • Written contracts for third-party authentication: Any outsourced signing workflow must be formally documented to meet FCC requirements.
  • Traffic blocking obligations: Providers must block traffic from any entity not listed in the RMD, even if STIR/SHAKEN compliance VoIP operators implementation is already in place.

Enforcement reality:

The compliance gap remains significant, with fewer than half of registered providers fully implementing STIR/SHAKEN compliance VoIP operators requirements. Enforcement is ongoing and becoming increasingly strict, with regulators actively taking action against non-compliant providers.

Also Explore: What Is STIR/SHAKEN? How It Works and Why It Matters

The Business Case: Why Compliance Protects More Than Just Your License

There is a tendency to treat STIR/SHAKEN compliance VoIP operators requirements as a regulatory checkbox, but that framing misses the commercial reality. The framework directly impacts call delivery rates, client retention, and reputation with upstream carriers.

Call Delivery and Client Trust

Unauthenticated calls are increasingly flagged by terminating carriers before they even ring. According to TNS 2025 data, major US carriers now apply “A” attestation to 80–100% of their own traffic, making unsigned or weakly signed calls stand out immediately. As a result, traffic without proper VoIP caller ID authentication is more likely to be labeled as spam or blocked.

For contact center operators, this directly affects revenue. Lower answer rates reduce campaign performance, increase support tickets, trigger contract disputes, and contribute to churn.

Enforcement Is Getting More Targeted

Enforcement is also accelerating. Over 1,200 voice service providers were removed from US telephone networks in 2025 following earlier warnings issued to thousands of providers for deficiencies in their RMD submissions.

The pattern is consistent: regulators identify issues, issue warnings, and then enforce. Operators who treat robocall compliance for operators as a one-time task instead of an ongoing responsibility are the most exposed.

Downstream Liability for Network Traffic

Call authentication VoIP requirements also extend beyond your own originated calls. If your platform routes traffic from providers not listed in the Robocall Mitigation Database (RMD), you may still be held accountable. This is especially critical for operators handling wholesale traffic or gateway functions, where verifying upstream RMD status is now part of core compliance due diligence.

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STIR/SHAKEN Implementation: A Practical Walkthrough for VoIP Operators

The STIR/SHAKEN implementation guide for operators typically follows a structured set of phases. Complexity depends on your network architecture and whether you originate calls directly or route them through third parties.

Step 1: Obtain Your SPC Token

Your Service Provider Code (SPC) token is issued by the STI Policy Administrator (STI-PA), managed by iconectiv in North America. An active operating company number (OCN) or equivalent identifier is required.

If you are a reseller without facilities-based infrastructure, you may qualify for an exemption from the SPC token requirement but Robocall Mitigation Database (RMD) filing is still mandatory.

Step 2: Acquire a Digital Certificate

After obtaining an SPC token, you must get a certificate from a STIR/SHAKEN-approved Certificate Authority. This certificate is used to sign PASSporTs for outbound calls.

Certificates are time-bound and must be renewed on schedule to avoid gaps in call authentication VoIP signing.

Step 3: Integrate Signing into Your Call Flow

This is the core technical step where SIP infrastructure applies the signature. Most modern systems support SIP Identity headers that carry the PASSporT.

Platforms like FreeSWITCH, OpenSIPS, and Asterisk offer native or extendable support. If using a third-party softswitch, confirm whether signing is built-in or requires middleware.

Key configuration decisions include:

  • Assigning A, B, or C attestation levels based on subscriber and number verification
  • Handling calls that transit from upstream providers before outbound routing
  • Managing SIP trunks where enterprise customers supply caller ID information

Step 4: File and Maintain Your RMD Certification

Signing calls is not enough. Your RMD certification must be active, accurate, and include a documented robocall mitigation plan.

If using third-party signing, a written contract is required, and your RMD must reflect your own certificate ownership after regulatory updates affecting STIR/SHAKEN compliance VoIP operators.

Step 5: Monitor for Over-Attestation and Ongoing Accuracy

A growing compliance risk is over-attestation, where invalid or Do-Not-Originate numbers are incorrectly signed as “A” level.

TNS 2025 data indicate up to 20% of traffic in some networks shows this behavior. This creates fraud exposure and is now a regulatory focus.

A compliant system must continuously audit attestation accuracy, not just implement VoIP caller ID authentication once.

What STIR/SHAKEN Does Not Solve (And What You Still Need)

Understanding the limits of call authentication VoIP is as important as understanding what it provides. Many operators run into issues when they treat STIR/SHAKEN as a complete solution instead of one layer in a broader trust and compliance strategy.

STIR/SHAKEN does not:

  • Block all illegal robocalls: It only verifies caller identity. It does not determine whether a call is legitimate or unwanted.
  • Validate call content: A properly signed call can still be fraudulent if the provider has not applied strong KYC controls.
  • Prevent all spoofing: Non-IP networks like TDM and SS7 may still allow gaps in protection.
  • Cover messaging channels: SMS spoofing and smishing fall outside the STIR/SHAKEN for telecom providers framework entirely.

This is not a limitation of STIR/SHAKEN compliance VoIP operators requirements, but a reminder that it must be combined with subscriber verification, traffic monitoring, and fraud detection systems. Operators who rely on STIR/SHAKEN alone risk exposure like non-compliant providers already penalized under robocall compliance for operators enforcement actions.

How iCallify Supports STIR/SHAKEN Compliance for VoIP Operators

For VoIP providers, MSPs, ITSPs, and telecom operators running multi-tenant deployments, STIR/SHAKEN compliance VoIP operators requirements must be handled at the platform level rather than through manual, tenant-by-tenant configuration. iCallify includes built-in support for STIR/SHAKEN for telecom providers as part of its US compliance stack, alongside E911 support and TCPA calling controls.

Within the iCallify operator platform, call authentication VoIP compliance is handled through:

  • Native STIR/SHAKEN signing integration: Call signing is embedded directly into the call flow, removing the need for external middleware and simplifying the overall architecture.
  • Multi-tenant compliance architecture: Operators can centrally manage STIR/SHAKEN settings across all tenants from a single dashboard instead of configuring each deployment individually.
  • Attestation management controls: The platform supports A, B, and C attestation assignment based on call type logic, helping reduce risks such as over-attestation in enterprise and trunk scenarios.
  • Robocall mitigation documentation support: Built-in logging and configuration tracking help operators maintain accurate records required for robocall compliance for operators and RMD-related documentation.

iCallify is deployed by VoIP providers and telecom operators across 90+ countries. For operators handling US traffic, VoIP caller ID authentication features are included as part of the standard platform deployment rather than as an add-on module.

STIR/SHAKEN Compliance Checklist for VoIP Operators

Use this checklist to evaluate your STIR/SHAKEN compliance for VoIP operators’ readiness before your next compliance review:

  • Active Robocall Mitigation Database (RMD) certification with current operational and contact information
  • Documented robocall mitigation plan filed and maintained in the RMD
  • Valid SPC token obtained, where required under STIR/SHAKEN for telecom providers obligations
  • Your own digital certificate used for VoIP caller ID authentication and call signing
  • Written agreement in place with any third-party authentication provider
  • A, B, and C attestation levels correctly configured based on call origin and verification status
  • Upstream providers verified for active RMD registration before accepting their traffic
  • Ongoing monitoring of attestation accuracy to prevent over-attestation of invalid or Do-Not-Originate (DNO) numbers
  • Regular review and updates of RMD filings whenever operational details change

Completing these steps helps maintain effective call authentication VoIP processes and supports ongoing robocall compliance for operators requirements.

Conclusion:

STIR/SHAKEN compliance VoIP operators requirements are no longer optional for providers handling US traffic. As enforcement becomes stricter and carriers place greater emphasis on trusted communications, maintaining proper VoIP caller ID authentication is essential for preserving call deliverability and network reputation.

For operators managing multi-tenant environments, the challenge is scaling compliance efficiently across all customers. Implementing call authentication VoIP at the platform level helps simplify management, improve consistency, and support ongoing robocall compliance for operators. Whether you’re deploying a new solution or reviewing an existing network, getting STIR/SHAKEN for telecom providers right is a critical foundation for long-term operational success.