scope:

There is a strong emphasis being placed by regulators in North America on strategies for combatting nuisance calls, including robocalls and calls where the caller identity is illegitimately spoofed. Caller authentication techniques, such as those described in ATIS standards related to Signature-based Handling of Asserted Information Using toKENs (SHAKEN) and Internet Engineering Task Force (IETF) RFCs related to Secure Telephone Identity Revisited (STIR), have been developed to allow calls traveling through interconnected carrier networks to have the legitimacy of the caller's identity evaluated by the originating carrier and validated by the terminating carrier, facilitating the delivery of an indication of the legitimacy of the caller identity information to the called party. Work is underway within ATIS to address the application of SHAKEN to 9-1-1 calls and callback calls, and to define techniques for mitigating the spoofing of other call-related information, such as Session Initiation Protocol (SIP) Resource-Priority header fields and Priority header fields.

This Technical Report provides a high-level description of the impacts on the processing of 9-1-1 calls and callback calls associated with the application of information spoofing mitigation techniques in an end-state Next Generation 9-1-1 (NG9-1-1) environment. The Technical Report also includes a roadmap describing the various standards/specifications that address this topic, and highlights the operational impacts associated with the application of false data manipulation mitigation techniques to 9-1-1 and callback call processing.

Purpose

This Technical Report provides an overview and analysis of operational impacts associated with applying STIR/SHAKEN caller identity authentication/verification and Resource-Priority Header (RPH) and Priority header signing/verification to 9-1-1 calls and callback calls.