[stir] FW: I-D Action: draft-ietf-stir-certificates-13.txt

[Michael Hammer <[e-mail]>]

Third try.



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Michael Hammer

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From: Michael Hammer
Sent: Wednesday, March 29, 2017 4:21 PM
To: '[e-mail]' <[e-mail]>; Tony Rutkowski <[e-mail]>
Cc: '[e-mail]' <[e-mail]>
Subject: RE: [stir] I-D Action: draft-ietf-stir-certificates-13.txt



Russ,



Sorry, not good enough.



First, it is incredibly bad form to redefine a well-known defined parameter from another SDO at a whim.  That just leads to confusion in the industry.  If you want to define something else, call it something else.



Second, to include extra characters with no definition of how they are to be used will lead to interoperability problems.

That is plain bad.

What do I do if I receive a string:  1#201*555*12324 ?



Lastly, this is a draft, so discussion is not over.

If something is broken, would be good idea to fix it.



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Michael Hammer

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From: stir [mailto:[e-mail]] On Behalf Of Russ Housley
Sent: Wednesday, March 29, 2017 2:38 PM
To: Tony Rutkowski <[e-mail]<mailto:[e-mail]>>
Cc: IETF STIR Mail List <[e-mail]<mailto:[e-mail]>>
Subject: Re: [stir] I-D Action: draft-ietf-stir-certificates-13.txt



Tony:



   TNAuthorizationList ::= SEQUENCE SIZE (1..MAX) OF TNEntry

   TNEntry ::= CHOICE {
               spc [0] ServiceProviderCodeList,
               range [1] TelephoneNumberRange,
               one E164Number
               }

   MH>>> Is this a choice of 2 or 3 items?
                Seems you can't enumerate item number [2]:  one E164Number.



   There are 3 items in the CHOICE (spc, range, and one)  The first two are SEQUENCE, so an explicit tag is needed to aid the decoder. The third item is an IA5String.



   ServiceProviderCodeList ::= SEQUENCE SIZE (1..3) OF IA5String

   TelephoneNumberRange ::= SEQUENCE {
               start E164Number,
               count INTEGER
               }

   MH>>> What is the difference between:
               Range = TelephoneNumber Range, where
                           Start is an E164Number, and
                           Count = 1
        and
               One = E164Number?
        Two alternate codes means more complex coding.



   The IA5String shows the stat of a block of phone numbers, and the count says the number of consecutive telephone numbers. It would be better to require count to be greater than 1.



   I suggest:



      count INTEGER (2..MAX)



   E164Number ::= IA5String (SIZE (1..15)) (FROM ("0123456789#*"))

   MH>>>           E164 numbers can be composed only of "0123456789", no?
               So, the use of # and * are currently undefined in this ID.
               I would assume that:
                           # would be an ending digit indicating the end of a shorter than 15 digit
   number.
                           * would be an ending digit wild-card meaning any phone numbers with
   preceding leading digits.
               However, that would render the meaning of "One" ambiguous, and
                           That would provide another way to do Range, which may complicate code.
               Also, what would it mean if the # or * appeared at the beginning or middle of
   a digit string?



   The WG already had a discussion on the list about whether to include # and *.  I believe this represents the outcome of that discussion.



   Russ