Re: [Sipping] draft-york-sipping-p-charge-info-12: ABNF

Well well isn't this fascinating.

I was just having a conversation with Dan about this today.

This draft now takes on increasing significance as it solves a nasty little
problem of billing in one way SIP traffic (Skype -  Google Voice etal) that
is vexing the FCC and the carriers as they try to deal with what is
legalistically called "phantom traffic".   It's the preference I'm told is
if no calling party number is available use a CIC or OCN code of sorts. In
two way it could state the preference for billing which is either The CPN or
'Charging Number' 

-----Original Message-----
From: sipping-bounces@ietf.org [mailto:sipping-bounces@ietf.org] On Behalf
Of Brett Tate
Sent: Tuesday, November 29, 2011 1:35 PM
To: dyork@lodestar2.com; tasveren@sonusnet.com; sipping@ietf.org
Subject: [Sipping] draft-york-sipping-p-charge-info-12: ABNF

Howdy,

Draft-york-sipping-p-charge-info-12 includes the following ABNF without
explicitly indicating if the charge-param is part of user,
telephone-subscriber, or both.  I'm not sure how to interpret the
charge-param statement since userinfo has no parameters (although user and
telephone-subscriber can have them).

Is charge-param part of user, telephone-subscriber, or both?  I recommend
updating section 7 to remove the ambiguity.

Thanks,
Brett

------

Draft-york-sipping-p-charge-info-12:

"The syntax of the P-Charge-Info header is described as follows:

         P-Charge-Info = "P-Charge-Info" HCOLON (name-addr / addr-spec)
                 ; name-addr and addr-spec are specified in RFC 3261
             charge-param = npi-param / noa-param / generic-param
             npi-param = ";npi" EQUAL npi-value
                 ; generic-param is specifed in RFC 3261
             npi-value = gen-value
             noa-param = ";noa" EQUAL noa-value
             noa-value = gen-value

   The SIP URI contained in the name-addr/addr-spec is the billing
   indicator that is passed between the parties.

   charge-param is used as a userinfo parameter in P-Charge-Info."

RFC 3261:

userinfo =  ( user / telephone-subscriber ) [ ":" password ] "@"
user     =  1*( unreserved / escaped / user-unreserved )

RFC 2806:

telephone-subscriber  = global-phone-number / local-phone-number

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