STIR/SHAKEN statistics from January 2024

The January 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 914 other voice service providers that originated calls, including some robocalls, signed with STIR/SHAKEN.

Many robocalls are signed with B or C attestation

Robocalls up slightly 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 up slightly across all attestation levels in the 0.2–1.3% range.

STIR/SHAKEN participation

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 leveling off

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 observed 15 new SHAKEN signers in January, a 1.7% 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 was no change in the total number. However, there was some churn, as some providers left the list and new providers appeared. We have observed that some providers disappear from the list briefly and then reappear shortly after. So, there might be a slight upward trend in this number as things settle down.

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

STIR/SHAKEN coverage

Signed calls at termination up slightly

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. This figure was up 2% in January, reaching 35%. This is the highest level we have observed, although still far below full coverage. We believe that the primary reason for low STIR/SHAKEN coverage is widespread non-IP interconnections across the telephone network.

Calls with full attestation up slightly

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 with full attestation. This figure increased 0.67%, reaching 24.62% in January. This is the highest percentage of A-level attestation that we have observed.

waterfall chart

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 were down sharply in December for calls signed with A- and B-level attestation. Unfortunately, these percentages have rebounded in January, although not back to the levels we observed last October.

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 up slightly.
  • While the number of participating providers remained level, the percentages of signed calls at termination and calls with full attestation increased.
  • The percentages of robocalls signed by the top 10 prolific robocall signers rebounded after a sharp drop in December, although not to the peak level seen in October.

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.

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