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National Security / Emergency Preparedness Priority Service Session Initiation Protocol Resource-Priority Header (SIP RPH) Signing and Verification using PASSporTs (ATIS-1000078)

This standard defines how the extension to the IETF Personal Assertion Token (PASSporT) [IETF RFC 8443,
PASSporT Extension for Resource-Priority Authorization] and the associated Secure Telephone Identity Revisited
(STIR) mechanisms are used to sign the Session Initiation Protocol Resource-Priority Header (SIP RPH) field of
National Security / Emergency Preparedness (NS/EP) Priority Services calls (i.e., calls containing the “ets” and/or
“wps” namespace parameter values) and convey assertions of authorization for Resource-Priority. Specifically, this
standard provides a mechanism for an originating service provider to cryptographically sign the SIP RPH field of an
authorized NS/EP Priority Service call and allow a receiving service provider to verify the validity of the authorization
for Resource-Priority and act on the information with confidence (i.e., verifying that the RPH information has not
been spoofed or compromised). Published September 13, 2021.