Proposed ATIS Standard for Signing of SIP RPH February 20, 2017 ATIS PTSC Proposed ATIS Standard for Signing of SIP RPH Ray P. Singh formerly Applied Communication Sciences

Outline Overview: Problem Statement Solution Objective and Proposal Proposed IETF STIR Extension Proposed ATIS Standard Using IETF STIR Extension Contribution List

Problem Statement Overview RFC 4412 defines the following namespaces for the SIP “resource-priority” header field (RPH): “DSN,” “DRSN, ” “Q735,” “ETS” and “WPS” The RPH namespace parameters could be spoofed or inserted by unauthorized entities Telephone service providers will drop RPH received from un-trusted networks Lack of means to verify authenticity of received RPH means service providers cannot act with confidence impacting NS/EP Priority Services supported using the “ETS” and “WPS” namespaces

Solution Objective and Proposal Define a mechanism leveraging SHAKEN to validate information populated in the namespace parameters in the SIP “resource-priority” header field (e.g., “ETS” and “WPS”) in support of NS/EP NGN-PS Solution Proposal IETF Define STIR PASSPorT extension to sign the RPH namespace parameters: ATIS Specify ATIS standard using STIR PASSPort extension for support of NS/EP Priority Services

Proposed [draft-ietf-stir-passport] extension: Define extension to sign the RPH namespace parameters: PASSPorT Claim PPT: “rph” “rph” claim Object “namespace” Values: “DSN,” “DRSN, ” “Q735,” “ETS” and “WPS”

ATIS Standard Specify ATIS standard for NS/EP Priority Services Use of PASSPort “rph” claim for “ETS” and “WPS” namespaces Define NS/EP attestations Attestation A. Full NS/EP Attestation The signing provider shall satisfy all of the following conditions: Is responsible for the NS/EP (ETS or WPS) authentication and authorization of the call/session Is responsible for populating the “ETS” or “WPS” namespace in the SIP RPH B. Partial NS/EP Attestation The signing provider shall satisfy all of the following condition: Is responsible for populating the “ETS” or “WPS” namespace in the SIP RPH.

Contribution List PTSC-2017-00028: Proposed New ATIS Issue for RPH Signing PTSC-2017-00029: Draft Standard on Signature-based Handling of SIP RPH Assertion using Tokens PTSC-2017-00030: Proposed [draft-tbd-stir-rph-01] for PASSporT extension

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