Re: I-D Action:draft-york-sipping-p-charge-info-10.txt

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, [email protected] 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/
>
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> implementation to automatically retrieve the ASCII version of the
> Internet-Draft.
>
>
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