
Data Driven Attestation Checks
Attestation Tester Insights
Caller ID Reputation’s STIR/SHAKEN Attestation Tester provides more data than any other service for call optimization.
- Attestation rating
- CNAM information
- Certificate data
- Verstat validation
The STIR/SHAKEN Attestation Impact
Why Does Attestation Matter?
Attestation checks are a key factor for call optimization.
Ideal attestation rates (A or B) are critical for successful calling. Telecom regulations require networks to block calls with ratings below B; calls from these numbers are killed before they even ring.
When you leverage our tester to run a check on your rating, you’re giving each of your numbers a fair shot at connection. Identify resource sinks in your number pool, keep agents busy, and ensure customers stay connected.
How Does STIR/SHAKEN Work in a Network?

A SIP INVITE is received by the originating telephone service provider.
The originating telephone service provider checks the call source and calling number to determine how to attest for the validity of the calling number.
- Full Attestation (A) — The service provider has authenticated the calling party and they are authorized to use the calling number.
- Partial Attestation (B) — The service provider has authenticated the call origination, but cannot verify the call source is authorized to use the calling number.
- Gateway Attestation (C) — The service provider has authenticated from where it received the call, but cannot authenticate the call source.
The originating telephone service provider uses the authentication service to create a SIP Identity header.
- Calling number
- Called number(s)
- Current timestamp
- Attestation level
- Origination identifier
The SIP INVITE with the SIP Identity header is sent to the terminating telephone service provider. In addition, the Identity token may be sent across the internet, around non-SIP call segments, using Out-of-Band SHAKEN.
The SIP INVITE with Identity header is passed to the verification service.
The verification service obtains the digital certificate of the originating telephone service provider from the public certificate repository and begins a multi-step verification process. If all verification steps are successful, then the calling number has not been spoofed.
The verification service returns the results to the terminating service provider’s softswitch or SBC.
The call is completed to the called party.

Instant Results
Results in Real-Time
How do you check your attestation?
Caller ID Reputation makes it easy to run an attestation check on your outbound numbers — and best of all, this valuable tool is included within our call optimization platform.
- 1) Register your numbers on Caller ID Reputation.
- 2) Directly call with your dialer to the testing tool.
- 3) Instantly receive a report.
We offer free trials of our STIR/SHAKEN attestation tester to our prospects. Simply sign up for a demo to request a review below.
Call optimization platform
Caller ID Reputation
Allows your company to...
- Detect mislabels on your phone numbers.
- Correct flags on call-blocking apps and AEs.
- Connect more with customers.
