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Gateway Attestation (C) ? The service provider has authenticated from where it received the call, but cannot authenticate the call source. An example of this case would be a call received from an international gateway.

STI-CR (Certificate Repository) This is an HTTPS web server hosting the public certificates and accessible to other service providers over the public internet. Every service provider with SHAKEN private keys in an SKS should have a corresponding STI-CR where its public certificates are published.

Essentially, the attestation levels are designed to protect the integrity of the telecom networks and provide a way to signal confidence levels to other carriers that the calls can be trusted, and at what level.

Attestation (Partial attestation) indicates that the telecom carrier that originated the call knows the customer that initiated the call but does not have an LOA indicating that the customer is authorized to use the Caller ID that the call is being originated from.

"Gateway Attestation", "C", indicates the call can only be verified as coming from a known gateway, for instance, a connection to another service provider.

STIR/SHAKEN digitally validates the handoff of phone calls passing through the complex web of networks, allowing the phone company of the consumer receiving the call to verify that a call is in fact from the number displayed on Caller ID.

"Gateway Attestation", "C", indicates the call can only be verified as coming from a known gateway, for instance, a connection to another service provider.

Gateway Attestation (C) - The identity of the caller is not known, as the call originated outside of the network, or internationally. C level is applied when A or B cannot be.

Steps to check your phone number reputation Prepare to make test calls from your phone numbers.Test call to each cell phone number.Assess your test call results.Your call was mislabeled.Ongoing vigilance is needed repeat and monitor weekly.

Attestation is a crucial part of the STIR/SHAKEN process and includes three categories to determine essential information about the caller by evaluating the attestation level of each call. These attestation levels distinguish a caller's validity to use a specific number.