The PASSporT format defines a token that can be carried by signaling
protocols, including SIP, to cryptographically attest the identify of
callers. Not all telephone calls use Internet signaling protocols,
however, and some calls use them for only part of their signaling
path. This document describes use cases that require the delivery of
PASSporT objects outside of the signaling path, and defines
architectures and semantics to provide this functionality.
Working Group Summary
This document began at the earliest stages of the STIR WG, though many
participants felt it was a distraction from the core work of the WG and
asked that focused effort start after the primary in-band work was completed.
This document has received review from a significant subset of the STIR
The document shepherd is Robert Sparks.
The responsible area director is Adam Roach.