Technical Summary
Secure Telephone Identity Revisited (STIR) provides a means of
attesting the identity of a telephone caller via a signed token in
order to prevent impersonation of a calling party number, which is a
key enabler for illegal robocalling. Similar impersonation is
sometimes leveraged by bad actors in the text and multimedia
messaging space. This document explores the applicability of STIR's
Personal Assertion Token (PASSporT) and certificate issuance
framework to text and multimedia messaging use cases, including
support both for messages carried as a payload in SIP requests and
for messages sent in sessions negotiated by SIP.
Working Group Summary
The consensus represented discussion among a fairly small group. The
consensus among the group was strong, and no one raised material objections
to the work.
Document Quality
The shepherd is not aware of existing implementations. There have been
statements that the work is needed by the emergency services community.
Otherwise, like much of the work of STIR, implementation depends upon the
work being used by other fora that define messaging systems and
inter-carrier interoperability, such as the 3GPP, the GSMA, or ATIS.
Personnel
Ben Campbell is the Document Shepherd.
Murray Kucherawy is the responsible Area Director.