STIR/SHAKEN Filtering That Stops Robocalls Without Blocking Real Callers

AvidTrak uses STIR/SHAKEN attestation to verify caller identity. Calls with strong verification are connected normally, while low-confidence calls are screened using a spam call filter. The spam filter determines the validity of the call, and connects the call if it is verified, or rejects it if it is a spam or a bot call.

How calls are handled:

  • Attested calls (A/B) pass through with no interruption
  • Unverified or low-confidence calls pass through a spam filter.
  • Admins have the flexibility to change the classification of calls to "Attested" or " Spam".
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Robocalls Are Still a Major Problem

Robocalls remain high-volume. In the U.S. alone, industry tracking estimates more than 52.5 billion robocalls were placed in 2025, many driven by illegal phone number spoofing.

A significant share of unknown calls is unwanted. Global data shows roughly 29 percent of unknown calls were flagged as spam calls or fraudulent robocalls in early 2024.

Supporting points:

  • Spam calls waste agent time and disrupt call centers.
  • Many spam call filters also block legitimate callers.
  • The goal is to stop robocalls without slowing real customers.

What STIR/SHAKEN Means

STIR/SHAKEN is a call authentication framework used to verify caller ID information across VoIP systems and Session Initiation Protocol (SIP) networks.

STIR defines Secure Telephone Identity, while SHAKEN explains how that identity is verified using SIP INVITE messages. Together, they provide a trust indicator that helps receiving networks assess whether a call is legitimate.

The framework is backed by the Federal Communications Commission (FCC) under the TRACED Act and supports broader robocall reduction across carrier networks.

STIR/SHAKEN Attestation Levels

  • A (Full): Provider knows the caller and confirms they’re authorized to use the number.
  • B (Partial): Provider knows the caller but cannot fully confirm number authorization.
  • C (Gateway): Provider can only confirm where the call entered the network.

These attestation levels support STIR/SHAKEN attestation and help systems handle calls without blanket blocking.

STIR/SHAKEN-Enhanced Robo call
Filtering Features

Multi-Profile

STIR/SHAKEN Caller Verification

Verifies caller identity using STIR/SHAKEN attestation, reading the attestation level from call headers to decide how the call should be handled.

Robo ID Challenge

Intelligent Robo ID Challenge

Applies a targeted spam call filter only to low-confidence or unsigned calls, prompting callers with a randomized digit challenge before connecting.

Safe Labeling

Safe Labeling and Call Control

Allows legitimate callers to be labeled Safe after passing verification, with admin controls to bypass future challenges or manually block repeat offenders.

See AvidTrak in Action

How AvidTrak Uses STIR/SHAKEN Technology To
Reduce Robo calls

01

Step 1 — Verify the Call

When a call enters the network, AvidTrak checks for STIR/SHAKEN attestation as part of the call authentication process in the call path. This verification step aligns with Secure Telephone Identity standards used across SIP-based networks.

02

Step 2 — Decide How to Handle It

AvidTrak evaluates the trust indicator before routing the call.

  • Attestation A or B: the call proceeds through normal call delivery
  • Unsigned or non-A/B calls: the system prepares a verification step
This decision happens before the call reaches agents or queues.

03

Step 3 — Challenge Only When Needed

For low-confidence calls, AvidTrak applies a quick Robo ID check as part of the call authentication ecosystem. Legitimate callers pass through, while suspicious traffic is filtered early to support robocall reduction. .

04

Step 4 — Record and Report

Each verification and challenge decision is logged within AvidTrak’s call analytics platform, with reporting available directly inside the AvidTrak dashboard.

Benefits of STIR/SHAKEN

Practical Benefits of STIR/SHAKEN Compliance For Daily Call Handling

  • Fewer interruptions for real callers: Calls with valid STIR/SHAKEN attestation connect normally, reducing unnecessary prompts and helping legitimate callers reach your business without added friction.
  • Less time spent on spam calls: Low-confidence and unsigned calls are challenged early, reducing exposure to spam calls and keeping nuisance traffic from consuming staff time.
  • Cleaner inbound queues for operations teams: Selective call deflection prevents unwanted calls from reaching agents, helping inbound queues stay focused on real customer conversations.
  • Control without blanket blocking: Calls are handled based on call verification and trust signals, allowing teams to challenge only when confidence is low and adjust rules as needed.
  • Clear visibility for oversight and review: Completed calls, challenged calls, and failed challenges are visible in the platform, supporting operational review and ongoing call handling decisions.

Businesses That Rely on AvidTrak

Apollidon
A-1 Concrete Leveling
Smooth Digital
Morbiz
MissQuito
Critter Control
New Horizons
Supply Post
Trutech Wildlife Service
Wabash
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Common Use Cases for STIR/SHAKEN-Based
Robocall Filtering

Dental & DSO Networks

Inbound customer support and service desks

Behavioral Health

Sales queues handling high call volume

Senior & Home Care

Agencies and MSP-managed phone lines

Medical Groups

Industries frequently targeted by robocalls and fraud

Clear visibility into how calls are handled, from
verification through completion.

Dental & DSO Networks

Completed calls

Behavioral Health

Challenged calls

Senior & Home Care

Failed Robo ID attempts

Affordable Plans for Businesses and Agencies

Starter

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$15 mo
  • 5 Numbers
  • 500 Minutes
  • 500 Call Recording Minutes
  • 500 CNAME Lookup Calls
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Professional

$30 mo
  • 10 Numbers
  • 1500 Minutes
  • 1500 Call Recording Minutes
  • 100 CNAME Lookup Calls
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Agency

Agency

$55 mo
  • 30 Numbers
  • 2500 Minutes
  • 2500 Call Recording Minutes
  • 300 CNAME Lookup Calls
  • 1000 Client Accounts
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Frequently Asked Questions

No. An A/B attestation confirms a caller's identity, not their intent. Under STIR/SHAKEN FCC guidelines, attestation is a trust signal used to guide call handling, not a guarantee of legitimacy.

Unsigned calls are gently screened using Robo ID. If the caller passes, the call connects normally. This approach supports STIR/SHAKEN implementation without blocking real customers.

Robo ID allows up to three attempts. Calls that fail all attempts are disconnected and flagged, helping reduce repeat spam while ensuring legitimate callers have a fair chance.

Yes. Robo ID calls that repeatedly fail can be blocked automatically or manually. This control helps businesses reduce nuisance traffic without affecting verified or safe callers.

No. The digit changes randomly for each challenge. This prevents replay attempts and supports effective call screening within AvidTrak’s STIR/SHAKEN implementation.

Not always. STIR/SHAKEN FCC standards work best on IP-based calls. Cross-border routes, legacy equipment, or non-IP paths may limit the availability of attestation.

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