STIR/SHAKEN statistics from August 2024

The August 2024 STIR/SHAKEN and robocall statistics are now available. The data show the latest trends in robocalls, STIR/SHAKEN participation, and attestation level usage. The latest trends are improving. Let’s have a look.

Signed robocalls by attestation level

Robocalls increased slightly

Figure 1. Signed Robocalls by Attestation Last 6 Months

Figure 1 shows signed robocalls by attestation level over the past six months. The numbers were up slightly from the previous month. Robocalls were up 0.02% for calls signed with A-level attestation, up 1.68% for calls signed with B-level attestation, and up 0.52% for calls signed with C-level attestation. Overall, robocalls were up 0.31%.

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 level

Figure 2. Monthly Number of OSPs Sending Signed Calls

Figure 2 shows the number of Originating Service Providers (OSPs) observed signing calls. This number has been hovering around 980.

The number of SHAKEN-authorized providers stays level

Figure 3. STIR/SHAKEN Authorized Providers by Month

Figure 3 shows the number of SHAKEN authorized providers. There was a surprising drop of 36 SHAKEN-authorized providers in August. Sometimes this number fluctuates as providers don’t renew on time, are removed from the list, renew, and then reappear on the list. We’ll watch this to see if that happens again.

These two measures show that the STIR/SHAKEN participation fluctuates slightly but seems level.

STIR/SHAKEN coverage

Signed calls at termination up

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 statistic was 48.6% in August, up 0.5% from 48.1% in July.

Calls 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 were 31.3% in August, up from 30.1% in July. Calls signed with B-level attestation were unchanged at 3.8%. Calls signed with C-level attestation were 11.1% in August, down slightly from 11.9% in July. There’s been a sizeable jump in calls signed with C-level attestation starting in June.

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 August, the robocall percentage for calls signed with A-level attestation by the top 10 prolific robocallers was 45.33%, up from 24% in July. This figure had been hovering over 80% for months leading up to May 2024. Prolific robocalls also rebounded for calls signed with B-level attestation to 68.5%, from 49.7% in July. These signers authenticate very few calls with C-level attestation.

Calls from prolific robocall signers

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 August, they signed 82.4% of their calls with A-level attestation, 16.9% with B-level attestation, and 0.7% with C-level attestation.

Recap

• Robocalls were up slightly.
• STIR/SHAKEN participation was level.
• STIR/SHAKEN coverage was up slightly. Almost half of the calls received at termination had SHAKEN information.
• The percentages of robocalls signed by the top 10 prolific robocall signers rebounded after a sharp drop in July.

TransNexus solutions

TransNexus is a leader in developing innovative software to manage and protect telecommunications networks. The company has over 25 years of 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.