The Call Authentication Framework
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the juNE 30, 2021 stir/shaken implementation deadline has passed
Now that it's July 1, will by calls be blocked?

Short answer: no. Deployment of a call authentication framework (STIR/SHAKEN) was a mandate of the TRACED Act. Within the TRACED Act, however, there is no specific language included that states unattested calls (calls not successfully entering and exiting the STIR/SHAKEN framework) will be simply blocked. Scroll below to learn more about the technology, the considerations and expectations of deployment, and more. Or check out this blog post recapping the lead-up and expectations for life post June 30.

Enterprise STIR/SHAKEN Gif


Secure Telephone Identity Revisited

Signature-based Handling of Asserted information using toKENs

STIR/SHAKEN is a framework designed to assign a certificate of authenticity to each phone call for use across the telecom network.

These certificates will act as a digital signature of trust passed from carrier to carrier to improve traceable call delivery.
STIR/SHAKEN: where did it come from

Robocall Mitigation For Service Providers

The FCC led the push for industry adoption of the new STIR/SHAKEN standards to improve the ability to trace back to illegal call origination (particularly fraudulent spoofing) across all carriers.

On March 31, 2020, the FCC mandated both originating and terminating voice service providers must implement the STIR/SHAKEN caller ID authentication framework in the IP portions of their networks by June 30, 2021. STIR/SHAKEN was also mandated by the TRACED Act.

To ensure the requirement was met, the FCC created a Robocall Mitigation Database where voice service providers were to file certifications with detailed information regarding their implementation of the STIR/SHAKEN caller ID authentication framework and/or a robocall mitigation program. According to the SHAKEN Standard on assigning attestation levels, the originating service provider must establish a policy to decide what constitutes “legitimate right to assert a telephone number,” and states that the reputation of the voice service provider may be impacted by how rigorous of a policy is defined and implemented.

Once implemented, STIR/SHAKEN should provide verification of the identity of originating party into the network, operationally across all carriers, especially to assist the Industry Traceback Group in the prosecution of bad actors. To find out more about the implications of this deadline, and call delivery post-June 30, check out our Tuesday Talks series.

Through a STIR/SHAKEN call, the originating service provider attests (or signs) the relationship with the caller, as well as their right to use that number. The use of an attestation indicator represents the originating signer’s ability to vouch for the accuracy of the source of origin of the call.

The levels of Attestation do not necessarily correlate to their trustworthiness. Analytics will remain in place for call validation treatment to ensure that unwanted, scam, or illegal phone calls will still be labeled accordingly.

Based on the current language provided by the TRACED Act, providers are not currently blocking calls based on its according Attestation Level.

[A] Full Attestation

source of call + Right to use caller id information
Attestation A

[B] Partial Attestation

source of call + Does not have the Right to use caller id information
Attestation B

[C] Gateway Attestation

Does Not know source of call + Does not have Right to use caller id information
Attestation C
The Checkmark
iOS Call log screenshot
The terminating result of a fully attested call is expected to render as a valid number indicator to a called party, for example a green checkmark. Through a few terminating providers, the checkmark may be presented at the time of call on Android devices or as a grey checkmark in the call log on iOS devices. The final display is still drastically limited by the device's capability to display complex data.

Numeracle's platform can support the STIR/SHAKEN delegated certificate model when it is fully adopted by the standards body. In the meantime, terminating service providers such as AT&T, T-Mobile, and Verizon are developing and enhancing local policies for rendering A-Level Attestation to a verified number indicator.

which service providers have done what?
The Robocall Mitigation Database
This April, the FCC created a Robocall Mitigation Database to enforce TRACED Act requirements mandating the implementation of a caller ID authentication framework at the network-level. All voice service providers were required to file a record in the new database by June 30, 2021, providing detailed information regarding their implementation of the STIR/SHAKEN caller ID authentication framework and/or a robocall mitigation program.

Some voice service providers were also able to request an extension to the deadline if they provided a comprehensive plan to implement a robocall mitigation solution in accordance with TRACED Act requirements.
Robocall Mitigation Database graphic
For more information on the June 30th STIR/SHAKEN deadline, read our blog: "Will My Calls be Blocked on July 1st?"
For more information on the requirements and filing process of the Robocall Mitigation Database and how to prepare for the deadline, read our blog: "Robocall Mitigation Plans: The Last Mile"
enterprise call authentication solutions

How to achieve STIR/SHAKEN verified calls

STIR/SHAKEN graphic - caller identity

As an enterprise calling brand, deploying STIR/SHAKEN on your behalf was the responsibility of your outbound voice service provider (VSP).

For service providers, ensuring your calls will be delivered as verified is a function of putting in place a "Know Your Customer" KYC-based methodology to identify every entity originating calls on the network. This can sometimes go many layers beyond understanding the service providers’ direct clients — the ones they maintain an actual contractual relationship with. This spans the depths of VSPs also needing to understand their clients’ clients (and those clients’ clients, and so forth) as well as any intermediary who the service provider is directly or indirectly delivering or facilitating calls on or on behalf of, from the calls’ origination to the calls’ termination.

verified caller identity for stir/shaken solution
numeracle leadership

STIR/SHAKEN & Numeracle's Verified Identity™


Advocacy &

To ensure the voice of the enterprise is represented and considered as an integral part of STIR/SHAKEN development, we serve on the IP-NNI Task Force (group co-authoring SHAKEN) and Chair the PACE Communication Protection Coalition.
Numeracle represents the interest of legal calling entities via its leadership as Chair of the Enterprise Communications Advocacy Coalition, to represent the combined STIR/SHAKEN interests and concerns of enterprises, contact centers, and more.
In support of our call center, industry, and association partners, we want to help you educate not only yourselves, but also the clients you serve. Please don't hesitate to reach out if we can help bring more awareness around STIR/SHAKEN to your team.

You & Your Carrier

Who Calls the Shots?

Enterprise Identity
More often than not, there are many 'layers' between an enterprise caller and the originating service provider responsible for generating call traffic on your behalf (i.e. dialing and CX platforms, multiple BPOs, outsourced call center partners, telephony vendors, etc.).
Call authentication through STIR/SHAKEN is all about validating the identity of a caller by connecting the dots between an enterprise, its call center vendors, and its originating carriers. You can start this process now by becoming a Numeracle Verified Identity™.
With so many 'layers,' it can be hard to prove who actually has authorization to originate traffic on your behalf when it matters most. We believe you (the enterprise) is in the best position to know who has the authorization to use any specific telephone numbers when making calls.
a crash course


ongoing industry discussion

Our STIR/SHAKEN Resources

Tuesday Talks
Our biweekly live Q&A series explores relevant topics related to call delivery, STIR/SHAKEN, caller ID technology, TRACED Act, brand identity, Rich Call Data, and so much more.

Check out our full podcast library here.
Listen on SoundCloud and YouTube for listening on-the-go.
Register for our next session

Live Panel Discussion

If you missed our live panel on STIR/SHAKEN "Verified" status and how it relates to the Enterprise & Contact Center, check out the intro to the event here, or watch the on-demand playback here!



Blog Posts

What do STIR/SHAKEN Verified Calls Tell you?What do STIR/SHAKEN Verified Calls Tell you?
Just because a call is verified, doesn't mean it hasn't been spoofed. Understand what a Verified Call with a green checkmark really means when you get one, and why it isn't guaranteed against fraud.
Top Startups helping Industries Reopen Post-COVIDTop Startups helping Industries Reopen Post-COVID
Numeracle was listed as one of the top startups, representing the telecom industry, that employs technology to adapt to the COVID-19 pandemic and resume operations in a safe and efficient manner.
Q&A Interview Presented by Somos: Delivering Trust and Added Value to Consumers Part ThreeQ&A Interview Presented by Somos: Delivering Trust and Added Value to Consumers Part Three
Q&A Interview Presented by Somos: Delivering Trust and Added Value to Consumers Part Three
It starts with an insight
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