I guess this draft has been going on for a long time.
I took a quick look at this version.
Because it is intended to document existing practice I won't take issue
with the good and the bad of the proposed form.
I do have some issue with the formal syntax and the accompanying formal
semantics. There are two header parameters defined: npi and noa. I
suppose those names have some mnemonic signficance, but it is nowhere
described in the draft. They might as well be "foo" and "bar".
Similarly the value syntax for those is gen-value, which is more or less
"anything". Appendix A lists values from ANSI T1.113 in relation to npi,
but there is no normative statement that the values should/must conform
to that, or what should happen if they do not. And there isn't even that
kind of hint for noa.
If, as is hinted at in appendix A, the values for npi are to be 3 digit
numbers (or numbers in some range), then it would be helpful to document
the syntax that way.
If the intent is that these values really can be "anything", which must
be agreed to out of band by the parties using the header, then that
should be stated.
Similarly there really is no documented significance to the URI in this
header. There should be some statement about the intended purpose of
this URI.
Thanks,
Paul
BTW, we don't really have a sipping group any longer. I presume this is
to be treated as an individual submission or AD-sponsored. I've replied
to the sipping mailing list, but that won't get a lot of readers. It
might be best to announce it on the dispatch list.
On 10/25/2010 4:15 PM, Internet-Drafts@xxxxxxxx wrote:
A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : P-Charge-Info - A Private Header (P-Header) Extension to the Session Initiation Protocol (SIP)
Author(s) : D. York, T. Asveren
Filename : draft-york-sipping-p-charge-info-10.txt
Pages : 13
Date : 2010-10-25
This document describes 'P-Charge-Info', a private Session Initiation
Protocol (SIP) header (P-header) used to convey billing information
about the party to be charged. This P-Header is currently in
production usage by a number of equipment vendors and carriers and
this document is submitted to request the registration of this header
with IANA. This P-Header may also be used in some situations to
carry the ISUP Charge Number parameter for PSTN interconnection.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-york-sipping-p-charge-info-10.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
_______________________________________________
I-D-Announce mailing list
I-D-Announce@xxxxxxxx
https://www.ietf.org/mailman/listinfo/i-d-announce
Internet-Draft directories: http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
_______________________________________________
Sipping mailing list https://www.ietf.org/mailman/listinfo/sipping
This list is for NEW development of the application of SIP
Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip
Use sip@xxxxxxxx for new developments of core SIP
