STIR/SHAKEN statistics from February 2024

The February 2024 STIR/SHAKEN and robocall statistics are now available. The data show the latest trends in robocalls, STIR/SHAKEN participation and attestation level usage.

We’ve been publishing monthly STIR/SHAKEN statistics since April 2021. These numbers are gathered from well over a hundred voice service providers using our STIR/SHAKEN and robocall prevention solutions. The data describe calls they received from 936 other voice service providers that originated calls, including some robocalls, signed with STIR/SHAKEN.

Many robocalls are signed with B or C attestation

Robocalls unchanged across all attestation levels

Line chart comparing robocall attestations over 6 months

Figure 1. Signed Robocalls by Attestation Last 6 Months

Figure 1 shows robocalls by attestation level over the past six months. Robocalls were mostly unchanged across all attestation levels. The biggest change was a 1.35% drop in robocalls signed with B-level attestation.

STIR/SHAKEN participation and coverage

We measure STIR/SHAKEN participation changes in two ways:

  1. The number of Originating Service Providers (OSPs) signing calls received by our customers,
  2. Service providers authorized to do SHAKEN by the STI Policy Administrator (STI-PA),

SHAKEN signing up slightly

line chart showing the number of originating providers sending signed calls

Figure 2. Monthly Number of OSPs Sending Signed Calls

Figure 2 shows the number of Originating Service Providers (OSPs) signing calls. We saw 22 new SHAKEN signers in February, a 2.4% increase.

The number of SHAKEN-authorized providers leveling off

line chart showing an increase in SHAKEN participation

Figure 3. STIR/SHAKEN Authorized Providers by Month

Figure 3 shows the number of SHAKEN authorized providers. There were 10 additional SHAKEN-authorized providers in February, a 0.8% increase.

These two measures show that the STIR/SHAKEN participation remains flat.

STIR/SHAKEN coverage

Signed calls at termination up

line chart showing the percentage of signed calls received at termination

Figure 4. The Percentage of Signed Calls at Termination Last 6 Months

Figure 4 shows the percentage of signed calls at termination for the past six months. There was good news in February when this statistic reached 37.4%, a 2.4% increase over January and a new all-time high.

This level of coverage is still way below where it needs to be to support the effective use of call attestation information by terminating providers. The primary reason for low STIR/SHAKEN coverage is widespread non-IP interconnections across the telephone network.

Calls with full attestation up

line chart showing the percentage of calls received at termination by attestation level

Figure 5. Percentage of Calls with SHAKEN Attestation Levels Last 6 Months

Figure 5 shows the percentage of calls signed by attestation level. Calls signed with full A-level attestation increased 2.24%, reaching 26.86% in February. This is the highest percentage of A-level attestation that we have observed.

woman working on a laptop

Patterns among prolific robocall signers

Here are robocall and attestation statistics for the top 10 SHAKEN-authorized providers ranked by the percentages of signed calls identified as robocalls.

Prolific robocall signers send many robocalls with A- and B-level attestation

robocalls among calls with A-level attestation are increasing

Figure 6. Robocall Percentage by Attestation—Prolific Robocall Signers by Robocall %

Figure 6 shows robocalls authenticated by prolific robocall signers over the past six months. These percentages dipped in December and rebounded in January, In February, these robocall percentages were down about 3% for calls signed with A- and B-level attestation and up 3% for calls signed with C-level attestation.

We believe that terminating providers should evaluate the reputation of STIR/SHAKEN signers and use it as an input to call validation treatment.


  • Overall robocalls were level.
  • Signed calls at termination and calls with full attestation increased.
  • The percentages of robocalls signed by the top 10 prolific robocall signers were down 3% for A- and B-level calls and up 3% for C-level calls.

TransNexus solutions

TransNexus is a leader in developing innovative software to manage and protect telecommunications networks. The company has over 25 years’ experience in providing telecom software solutions including branded calling, toll fraud prevention, robocall mitigation and prevention, TDoS prevention, analytics, routing, billing support, STIR/SHAKEN and SHAKEN certificate services.

Contact us today to learn more.

Request information

* required

This information will only be used to respond to your inquiry. TransNexus will not share your data with any third parties. We will retain your information for as long as needed to retain a record of your inquiry. For more information about how we use personal data, please see our privacy statement.