Call Authentication
The terminating-side service that validates a call's signature and returns a verification status used for call display and analytics.
The verification service retrieves the signing certificate, checks the chain of trust, validates the signature and freshness of the PASSporT, and compares the signed numbers with the numbers actually presented in the SIP INVITE.
It returns a verstat value — typically TN-Validation-Passed, TN-Validation-Failed, or No-TN-Validation — which the terminating provider can pass to the handset or feed into its analytics and blocking decisions.
Verification results are increasingly used as an input to call blocking and labeling, so a failure on your outbound traffic directly reduces the number of calls your customers get answered.
The originating-side service that decides an attestation level, builds the PASSporT, signs it, and inserts the Identity header into the outbound SIP INVITE.
The SIP header that carries the signed PASSporT token proving a call's caller ID was authenticated by the originating provider.
The FCC-mandated framework that cryptographically signs calling numbers so terminating carriers can verify the caller ID was not spoofed.
Analytics-driven tags such as 'Scam Likely' or 'Spam Risk' that terminating carriers and handsets apply to inbound calls.
SipShield scores live SIP traffic with patented AI so the controls behind this term run automatically — and leave the audit trail regulators expect.