scope:

The Scope of this Technical Report is an analysis of the impacts of applying Secure Telephone Identity Revisited (STIR), as specified in RFC 8224 Authenticated Identity Management in the Session Initiation Protocol (SIP) [Ref 1] and Signature-based Handling of Asserted Information Using toKENs (SHAKEN), as specified in ATIS-1000074-E [Ref 2], Errata on ATIS Standard on Signature-based Handling of Asserted information using toKENs (SHAKEN). to 9-1-1 calls and callback calls. This Technical Report will also analyze the impacts of applying Resource-Priority Header (RPH) and SIP Priority header signing and verification to 9-1-1 calls and callback calls.