Subject: [Enum] Impl.Issues: 8 - Evaluation order for NAPTR with multiple ENUservices

From: "Conroy, Lawrence (SMTP)" <[email-masked]>
Date: Tue, 4 Nov 2003 15:00:59 +0000

Hi folks,
   one more issue; the only NAPTRs we've seen with more than one ENUMservice in
them are ones tied to mobile phones, but it's a general 
implementation issue, so...

Q:  If a NAPTR contains more than one ENUMservice, should these ENUMservices be
evaluated from left to right, or from right to left?

Background:  This matters, as the Registrant may populate NAPTRs in 
which they intend
to specify that they prefer to receive an SMS, and only if this can't 
be done to receive
a voice call. If these two ENUMservices are tied to the same URL (and 
have adjacent
preferences) then a single NAPTR may be "published" holding both ENUMservices.

However, should this be:
  'E2U+sms:tel+voice:tel' '!^.*$!tel:44-767-123-4567'
or instead:
  'E2U+voice:tel+sms:tel' '!^.*$!tel:44-767-123-4567'

Our Client chooses left-to-right evaluation order for NAPTRs with 
multiple ENUMservices.

If anyone can think of a good reason to process right to left, please holler.

all the best,
   Lawrence
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