[Serusers] ENUM support

[Jörg Bauer/Denic]

The idea of using ENUM at the server-side has a lot of problems

Example:
you get this from DNS

1)      NAPTR 10 10 "u" "sip+E2U" "!^.*$!sip:blabla at example.com!" .
2)      NAPTR 10 20 "u" "sip+E2U" "!^.*$!sip:blabla2 at otherexample.com!" .
3)      NAPTR 10 10 "u" "tel+E2U" "!^.*$!iax:0900 at expensivenumber.sex!" .

What to do ??
 
First try 1) or 3) ???
What happens if this failes ?? (not reachable, busy ??)
Is the user willing to pay the costs for 3) ??
Maybe the user wants to dial the REAL number (remember ENUM is a 
additional information for the real world phone number). How will you find 
this out ???

My conclusion is that ENUM is ALLWAYS a funktionality of the client and 
NEVER of the server because of the need for the user to decide what he 
realy wants to do. Any automatic resolution will fail.

Maybe there is a need for a kind of communication between Server and 
Client (inside SIP ??) to solve these kind of problems.
Any ideas how so solve this problem ???
 
serusers-admin at lists.iptel.org wrote on 14.04.2003 21:32:49:

> Hi Mat,
> 
> Enum is basically a ITEF standard for mapping communications services 
based
> on a standard telephone numbers... the client converts a phone number 
into a
> dns entry then looks up records based on this conversion process 
(documented
> in the standard)...
> 
> There are a number of standards docs at the IETF web site describing the
> actual standard.
> 
> Steve
> 
> 
> ----- Original Message -----
> From: "Mat Harris" <mat.harris at genestate.com>
> To: "Steve Lewis" <h_stephen_lewis at hotmail.com>
> Cc: "'Juha Heinanen'" <jh at lohi.eng.song.fi>; <serusers at lists.iptel.org>
> Sent: Monday, April 14, 2003 7:38 AM
> Subject: Re: [Serusers] ENUM support
> 
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