I see your point about this adding a value to the entry created by RFC 4458.
Is there a reason this can not simply be PS? The fact that 4458 is
Informational does not, as far as I can tell, justify continuing the
error. While this is for a 3GPP usage, it appears to have been reviewed
by the Dispatch WG sufficiently to justify PS.
One could argue that there is a down-ref issue, but the fact that the
field is in a standards-track required registry would seem to make that
a moot point.
Yours,
Joel
PS: It would seem that WG discussion of that sort is something we would
like to see in Shepherd writeups.
On 12/15/16 11:28 PM, Ben Campbell wrote:
Hi Joel,
Thanks for the comments. There has been a fair amount of discussion
about the status of the draft. The situation is clearly not optimal, and
I welcome input on how to straighten it out.
The rational so far has been that this draft updates RFC 4588, which is
informational. It adds some additional values and related semantics for
the "cause" parameter from 4588. It does not register new parameters;
rather it adds itself as a reference in the existing "cause"
registration. This is mainly a courtesy to readers. (There is no
sub-registry for "cause" parameter values.) We might could get by
without that change, since in a perfect world people following the IANA
reference to 4588 would notice the "Updated by..." tag.
The gotcha is that RFC 4588 would not be possible as an informational
today; it would not have standing to register the "cause" parameter. But
at the time it was published, there was a lack of clarity around the
"standards action" policy for the SIP URI parameters registry. Making
the new values from _this_ draft standards track, when the parameter
itself is not, doesn't seem appropriate. We had some discussion about
whether we should promote 4588 to PS, but there was not consensus to do
so when it was published, and I don't see reason to expect that to have
changed.
This draft is primarily intended to meet a need in 3GPP, where I
understand they are effectively already doing this. Would it help to
more tightly scope this as "Here's something 3GPP is doing..." rather
than as a general mechanism?
Thanks!
Ben.
On 15 Dec 2016, at 21:57, Joel Halpern wrote:
Reviewer: Joel Halpern
Review result: Ready with Issues
Major:
This document defines a new code for use in SIP, and specifies new
behavior both for the code itself and for its use in history-info. I
am thus confused as to how this can be an informational RFC. It looks
like it either Proposed Standard or experimental. Yes, I see that RFC
4458, which this updates is Informational. But just because we did it
wrong before does not make that behavior correct now. In addition to
my understanding of the roles of different RFCs, I note that RFC 3969
and the IANA registry both state that this assignment must be made by
a standards track RFC.
Minor:
Given our emphasis on IPv6 over IPv4, would it not make sense for
the examples to use IPv6 addresses? (Inspired by the Id-Nits alert.)