Last Call Review of draft-ietf-stir-rph-05
review-ietf-stir-rph-05-opsdir-lc-chown-2018-05-08-00

I have reviewed this document as part of the Operational directorate's ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written with the intent of improving the operational aspects of
the IETF drafts. Comments that are not addressed in last call may be included
in AD reviews during the IESG review.  Document editors and WG chairs should
treat these comments just like any other last call comments.

PASSporT (RFC8225) defines a method for creating and validating a token that
cryptographically verifies an originating identity or, more generally, a URI or
telephone number representing the originator of personal communications.  This
document extends PASSporT to also support cryptographic signing of the 'SIP
Resource Priority' header field indicating resource prioritisation for the
communication, to mitigate abuse of that field.

The document is quite well written, but includes some repetition of material,
in particular in the introduction, and a few minor grammatical issues.

The document is Ready for publication, with minor nits.

Nits:
* Tidy up or simplify the introduction text, which is unnecessarily verbose.
* Check the text for grammatical issues, especially use of the indefinite
article.