STIR/SHAKEN statistics from July 2023

The July 2023 STIR/SHAKEN and robocall statistics are now available. The data show the latest trends in robocalls, STIR/SHAKEN participation and attestation level usage.

Many robocalls are signed with B or C attestation

Calls signed with B attestation Were 4.8 Times more likely to be robocalls

Figure 1. Robocall % by Verification Status

Figure 1 compares the percentage of robocalls by attestation level, for unsigned calls, and for all calls in July 2023. Notice that calls signed with B- or C-level attestation include a high percentage of robocalls. Calls signed with B-level attestation were 4.4 times more likely to be robocalls than unsigned calls.

Robocalls signed with B or C attestation remain high

Figure 2. Signed Robocalls by Attestation Last 6 Months

Figure 2 shows this trend over the past six months. Notice that robocalls signed with B- or C-level attestation were much higher than the robocall percentage for all calls. The percentage of robocalls among calls signed with C-level attestation had been on a downward trend, from February through April but has rebounded to 20% in July. The percentage of robocalls among calls signed with B-level attestation has been hovering around the 22%–23% range, settling at 21.5% in July.

SHAKEN participation increases

We measure STIR/SHAKEN participation changes in three ways:

1. Originating Service Providers (OSPs) signing calls received by our customers,
2. Service providers authorized to do SHAKEN by the STI Policy Administrator (STI-PA),
3. New certification filings in the Robocall Mitigation Database (RMD).

SHAKEN signing up

Figure 3. Monthly Number of OSPs Sending Signed Calls

Figure 3 shows the number of Originating Service Providers (OSPs) signing calls. This had been increasing by about 10/month in previous months. We observed 87 new SHAKEN signers in July.

The number of SHAKEN-authorized providers increases slightly

Figure 4. STIR/SHAKEN Authorized Providers by Month

Figure 4 shows the number of SHAKEN authorized providers. As with OSP signers, this number has an upward trend that has been increasing in recent months. There were 37 new SHAKEN authorized providers in July, a modest 3% increase from June.

New Robocall Mitigation Database filings down

Figure 5. New Robocalls Mitigation Database Filings by Month

Figure 5 shows that new certification filings in the Robocall Mitigation Database increased by 31 in July.

These three measures show that the STIR/SHAKEN participation had a modest improvement following a strong increase in June.

Most calls reach their destination unsigned

Most calls arrive unsigned

Figure 6. Percentage of Calls by Verification Status

Figure 6 shows that most calls arrive for termination unsigned in July.

Signed calls at termination increasing slowly

Figure 7. The Percentage of Signed Calls at Termination Last 6 Months

Figure 7 shows the percentage of signed calls at termination for the past six months. This figure had been hovering around 24%. In recent months, we’ve observed this number slowly increasing, reaching 34% in July. This is the highest level of signed calls at termination we’ve observed.

Calls with full attestation increase

Figure 8. Percentage of Calls with SHAKEN Attestation Levels Last 6 Months

Figure 8 shows that the percentage of calls signed with full attestation has been climbing over the past six months, from 17% in February to 24.5% in July.

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 increase robocalls among A- and B-level attestation calls

Figure 9. Robocall Percentage by Attestation—Prolific Robocall Signers by Robocall %

Figure 9 shows that the robocall percentage of calls signed with A- and B-level attestation increased in July to their highest levels in six months. Oddly, robocalls were down sharply among calls signed with C-level attestation.

More A-level attestations from prolific robocall signers

Figure 10. Attestation Allocation—Prolific Robocall Signers by Robocall %

Figure 10 shows the attestation allocations for all calls received from these prolific robocall signers. A-level attestations increased 4%, while B- and C-level attestations were down 2% each.

Recap

• Robocalls signed with B- or C-level attestation remain high.
• Robocall percentages among the top 10 prolific robocall signers were up among A- and B-level attestation calls.
• STIR/SHAKEN participation continues to improve gradually.
• The percentage of signed calls received at termination is slowly improving.

TransNexus solutions

TransNexus is a leader in developing innovative software to manage and protect telecommunications networks. The company has over 20 years’ experience in providing telecom software solutions including toll fraud prevention, robocall mitigation and prevention, TDoS prevention, analytics, routing, billing support, STIR/SHAKEN and SHAKEN certificate services.

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