I wrote up the "170" trace proposal as an I-D:

A new version of I-D, draft-worley-trace-00.txt has been successfuly
submitted by Dale Worley and posted to the IETF repository.

Filename:        draft-worley-trace
Revision:        00
Title:           SIP Tracing Facility
Creation_date:   2009-03-03
WG ID:           Independent Submission
Number_of_pages: 18

Abstract:
This document defines a SIP option tag, "trace", to be used within
SIP messages to request that SIP elements (both proxies and UASs)
that receive the message reflect to the UAC the request they received
and the response they gave by encapsulating the request and response
in a provisional response.  A new provisional response code "170" is
defined to carry the request and response.  This option tag is
expected to be used solely for diagnostic purposes.


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