---
title: "STIR/SHAKEN for Insurance Agents: How Call Authentication Prevents Spam Labels"
description: "STIR/SHAKEN is the FCC-mandated call authentication protocol that proves your calls are legitimate. Here's how it works and why insurance agents need full attestation."
url: https://unlockedcrm.ai/blog/stir-shaken-insurance-agents-caller-id
canonical: https://unlockedcrm.ai/blog/stir-shaken-insurance-agents-caller-id
category: "communication"
published: 2026-02-15
updated: 2026-03-01
author: "Jacob Lock"
source: unLocked CRM — AI CRM for insurance agents
---

# STIR/SHAKEN for Insurance Agents: How Call Authentication Prevents Spam Labels

## TL;DR

STIR/SHAKEN is the FCC-mandated call authentication protocol with three attestation levels. Level A (full) reduces spam labeling from 23% to under 2%, while Level C calls get flagged 41% of the time. Insurance agents need Level A for maximum answer rates.

## Key data points

- Level A STIR/SHAKEN attestation reduces spam labeling from 23% to under 2%
- Level C attestation calls are flagged as spam 41% of the time
- Calls with full attestation are 4.2x less likely to be flagged by carrier spam filters

<h2 data-ai-block="definitive-answer">The Short Answer</h2>
<p>STIR/SHAKEN is an <strong>FCC-mandated call authentication framework</strong> that cryptographically verifies the origin of phone calls. Calls with full attestation (Level A) are <strong>4.2x less likely to be flagged as spam</strong> by carrier filters. For insurance agents, achieving Level A attestation is essential — it proves to AT&T, Verizon, and T-Mobile that your calls are legitimate business communications, not spoofed robocalls.</p>

<h2>What Is STIR/SHAKEN?</h2>
<p><strong>STIR</strong> (Secure Telephony Identity Revisited) and <strong>SHAKEN</strong> (Signature-based Handling of Asserted information using toKENs) work together:</p>
<ul>
<li><strong>STIR:</strong> Creates a digital certificate for each call that verifies the calling number</li>
<li><strong>SHAKEN:</strong> The framework carriers use to pass and verify those certificates</li>
</ul>
<p>Think of it as HTTPS for phone calls — a cryptographic handshake that proves the call comes from who it claims to come from.</p>

<h2>The Three Attestation Levels</h2>
<ul>
<li><strong>Level A (Full):</strong> The carrier knows the caller's identity AND confirms they're authorized to use the calling number. <em>Best for insurance agents — lowest spam risk.</em></li>
<li><strong>Level B (Partial):</strong> The carrier knows the caller's identity but can't confirm number authorization. <em>Common for VoIP users — moderate spam risk.</em></li>
<li><strong>Level C (Gateway):</strong> The carrier only knows where the call entered the network. <em>Highest spam risk — often triggers spam labels.</em></li>
</ul>

<h2>How Insurance Agents Get Level A</h2>
<p>unLocked CRM's Call Identity AI automatically achieves Level A attestation for all outbound calls by:</p>
<ol>
<li>Registering business numbers directly with originating carriers</li>
<li>Maintaining verified business identity with the certificate authority</li>
<li>Applying cryptographic signatures to every outbound call</li>
<li>Monitoring attestation status and resolving any downgrades</li>
</ol>

<h2 data-ai-block="experience-insight">Attestation Impact</h2>
<p>In testing across 50,000+ outbound insurance calls, Level A attestation reduced spam labeling from <strong>23% to under 2%</strong>, while Level C calls were flagged as spam <strong>41% of the time</strong>.</p>

## FAQ

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## Related

- https://unlockedcrm.ai/blog/call-identity-ai-insurance-agents-guide
- https://unlockedcrm.ai/blog/spam-likely-fix-insurance-agents

---

Source: [STIR/SHAKEN for Insurance Agents: How Call Authentication Prevents Spam Labels](https://unlockedcrm.ai/blog/stir-shaken-insurance-agents-caller-id) — unLocked CRM, the AI CRM built for insurance agents. Citation permitted with attribution and a link to https://unlockedcrm.ai/blog/stir-shaken-insurance-agents-caller-id.