Call Authentication
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 authentication service typically sits alongside the session border controller or softswitch. When a call is offered, the SBC hands the call details to the STI-AS, which returns a signed Identity header for the outbound leg.
The attestation decision is the hard part and is entirely the originating provider's responsibility: it depends on customer identity verification and on whether the calling number is one the customer is authorized to use.
The STI-AS is only as trustworthy as the customer data feeding it. Automating attestation from verified number inventory and KYC records is what keeps A attestation defensible.
The terminating-side service that validates a call's signature and returns a verification status used for call display and analytics.
The three confidence levels an originating carrier assigns when signing a call, describing how well it knows the customer and their right to use the calling number.
The network element that sits at the edge of a voice network to control signaling and media, enforce security policy, and normalize SIP between networks.
Evidence that a customer is genuinely authorized to use the telephone numbers they present as caller ID.
SipShield scores live SIP traffic with patented AI so the controls behind this term run automatically — and leave the audit trail regulators expect.