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Subject: Discussion List for Freenum/ITAD Subscriber Number (ISN) Project

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Re: [isn-discuss] Format of NAPTR records

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  • Subject: Re: [isn-discuss] Format of NAPTR records
  • Date: Fri, 6 Oct 2006 21:04:02 -0400

From: James Cloos

[1] 'sed-like' is nowhere near specific enough; either interpretation
remains possible w/o further guidance.

It's certainly not specified well enough.

(Though I can argue in principle that in the numerous situations in
Unix-land where search-and-replace is done with this sort of syntax,
the replacement string always replaces only the substring matched --
sed, vi, bash ("${parameter/pattern/string}"), Perl. I suspect all
these examples were copied from sed, directly or indirectly.)

And clearly implementors have presumed that the proper result is to
replace the entire input with the replacement string, rather than
just the matched input.

This should be brought up on the appropriate ietf wg (whichever one
that is :).

Is it agreed that ISN translations should work the same way as ENUM
translations? If so, I can track down the ENUM people and find out
what is intended with ENUM.

But I agree that it would be more robust to change over as many ISN
naptr RRs as possible to match Dale's suggestion. It can't break
anything and it just might fix things for some users (if any are
experiencing problems due to differing interpretations of the rfcs).

Pingtel Corp. is about to install its NAPTR record (*421). We'll use
it as a test case.

It's good to hear that Asterisk and SER handle either version. And
sipX will soon...


Dale Worley

Students ask me, "You've administered in the university and in
business and in government. What's the difference?" And I say I
quickly learned that in business, you had to be very careful when you
told somebody to do something, because the chances were very high that
he or she would do it, whereas in the government you didn't have to
worry about it. In the university, you weren't supposed to tell
anybody to do anything in the first place. -- George P. Shultz

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