PASSporT Extension for Diverted Calls
draft-ietf-stir-passport-divert-09
Network Working Group J. Peterson
Internet-Draft Neustar
Updates: RFC8224 (if approved) July 13, 2020
Intended status: Standards Track
Expires: January 14, 2021
PASSporT Extension for Diverted Calls
draft-ietf-stir-passport-divert-09
Abstract
PASSporT is specified in RFC 8225 to convey cryptographically-signed
information about the people involved in personal communications.
This document extends PASSporT to include an indication that a call
has been diverted from its original destination to a new one. This
information can greatly improve the decisions made by verification
services in call forwarding scenarios. Also specified here is an
encapsulation mechanism for nesting a PASSporT within another
PASSporT that assists relying parties in some diversion scenarios.
Status of This Memo
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This Internet-Draft will expire on January 14, 2021.
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Peterson Expires January 14, 2021 [Page 1]
Internet-Draft PASSporT Diverted July 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. The 'div' PASSporT Type and Claim . . . . . . . . . . . . . . 4
4. Using 'div' in SIP . . . . . . . . . . . . . . . . . . . . . 6
4.1. Authentication Service Behavior . . . . . . . . . . . . . 6
4.2. Verification Service Behavior . . . . . . . . . . . . . . 8
5. The 'div-o' PASSporT Type . . . . . . . . . . . . . . . . . . 10
5.1. Processing 'div-o' PASSporTs . . . . . . . . . . . . . . 12
6. Definition of 'opt' . . . . . . . . . . . . . . . . . . . . . 13
7. 'div' and Redirection . . . . . . . . . . . . . . . . . . . . 13
8. Extending 'div' to work with Service Logic Tracking . . . . . 14
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 15
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15
10.1. JSON Web Token Claims Registrations . . . . . . . . . . 15
10.1.1. 'div' registration . . . . . . . . . . . . . . . . . 15
10.1.2. 'opt' registration . . . . . . . . . . . . . . . . . 16
10.2. PASSporT Type Registrations . . . . . . . . . . . . . . 16
11. Privacy Considerations . . . . . . . . . . . . . . . . . . . 16
12. Security Considerations . . . . . . . . . . . . . . . . . . . 17
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
13.1. Normative References . . . . . . . . . . . . . . . . . . 17
13.2. Informative References . . . . . . . . . . . . . . . . . 18
Appendix A. Appendix A: Keys for Examples . . . . . . . . . . . 19
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 19
1. Introduction
A Personal Assertion Token (PASSporT [RFC8225]) is a token format
based on the JSON Web Token (JWT [RFC7519]) for conveying
cryptographically-signed information about the people involved in
personal communications; it is used by the Secure Telephone Identity
Revisited (STIR [RFC8224]) protocol to convey a signed assertion of
the identity of the participants in real-time communications
established via a protocol like SIP. This specification extends
PASSporT to include an indication that a call has been diverted from
its original destination to a new one.
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