STIR/SHAKEN statistics from December 2025

December 2025 STIR/SHAKEN and robocall statistics are now available. The data show the latest trends in robocalls, STIR/SHAKEN participation, and attestation level usage. Let’s have a look.

Signed robocalls by attestation level

Robocalls with B-level attestation down

Figure 1. Signed Robocalls by Attestation Last 6 Months

Figure 1 shows signed robocalls by attestation level over the past six months. Overall, the statistics were mostly level with November. Robocalls among all calls were up 0.1%. Robocalls signed with A-level attestation were up 0.3%. Robocalls among calls signed with B attestation were down 14.4%, partially reversing the sharp increase in October and November. Robocalls among calls signed with C attestation were down 0.1%.

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).

The number of SHAKEN signers increased

Figure 2. Monthly Number of OSPs Sending Signed Calls

Figure 2 shows that the number of Originating Service Providers (OSPs) observed signing calls in December was up 2.1% from the previous month.

The number of SHAKEN-authorized providers decreased slightly

Figure 3. STIR/SHAKEN Authorized Providers by Month

Figure 3 shows that the number of SHAKEN-authorized providers in December was down 1.9% from the previous month.

STIR/SHAKEN coverage

Signed calls at termination up slightly

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 was up 0.9% in December, to 44.4%.

We believe that this statistic reflects calls being routed over non-IP segments in the call path, where the SHAKEN call authentication information is lost. We suspect that perhaps some authentication providers are deliberately routing calls over non-IP call segments to launder their identity from the calls they authenticated.

More calls signed with A-level attestation

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 were 30.1% in December, up 1.9% from November. Calls signed with B-level attestation were 3.3%, down 0.7% from November. Calls signed with C-level attestation were 8.3%, down 0.7% from November.

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.

Robocalls from prolific robocall signers down

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

Figure 6 shows robocalls authenticated by the top 10 robocall signers ranked by robocall percentage over the past six months.

In December, the robocall percentage among prolific robocall signers was down 17.0% across all attestation levels. Robocalls with A-level attestation were up 10.0%. Robocalls with B-level attestation were down 83.2%. Robocalls with C-level attestation were up 30.0%.

Prolific robocall signers moved back to A-level attestation

Figure 7. Call Percentage by Attestation—Prolific Robocall Signers

Figure 7 shows the percentages of calls signed by the top 10 robocall signers by authentication level. In December, 88.1% of the calls authenticated by prolific robocall signers had an A-level attestation, while only 7.6% had a B-level attestation. These percentages reversed a trend away from A-level attestations and toward B-level attestations that we observed in October and November.

Recap

• Robocalls were mostly level with November.
  • There had been a large jump in robocalls at the B attestation level in October and November. This was partially reversed in December.
• STIR/SHAKEN participation faltered slightly, with fewer SHAKEN signers and authorized providers.
• STIR/SHAKEN coverage increased 0.9%, reaching 44.4%.
• Robocalls authenticated by prolific robocall signers dropped 17%. They are back to signing most calls with A-level attestation.

TransNexus solutions

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

Contact us today to learn more.