Re: [Enum] IETF, ENUM and NGN

["Conroy, Lawrence (SMTP)" <lwc at roke.co.uk>]

Hi Mike, folks,
 I'm slightly at a loss here. I fear that we will just have to disagree 
on this one.

You seem to be asking if I have a E2U+sip entry. The answer to that is 
"some of the time, yes".

You then ask what kind of access I have. The domain of the SIP address 
is mine; I registered it.
As it happens, the domain of the domainpart of the SIP AoRs "at work" 
was also registered by me.
The IP address range I have at home was assigned via my DSL Internet 
Access Provider. My company's
IAP also arranged for the IP range used by my company. I have to ask, 
"this is pertinent because...?".

I must disagree over your definition of an Enterprise as a Service 
Provider.
An Enterprise can register ENUM domains for the E.164 numbers via which 
it is
provided Communications Service by a 3rd party CSP.
It is the end user assignee for these E.164 numbers, and so a 
->potential<- ENUM Registrant.
The CSP is not the end user, and so (on this side of the pond) cannot 
register ENUM domains
for those E.164 numbers.

Once registered, if I (or my company) choose to put anything I/they 
want into my/their ENUM
domains, then (as I/they are paying to have it published) that's 
my/their choice.
Given that any reasonable DNS server handles "split horizon", what you 
see may well not be
what I see. Again, that's my/their choice.
Whether or not my company allows IP calls from teleworkers or Extranet 
partners is also our
choice. Other registrants can make different choices in their domains - 
I'm not stopping them
and they're not stopping me.

Equally, if an Enterprise chooses not to register in ENUM, that's also 
their choice.

Finally, if and when caller/callee prefs and the rest of the 
infrastructure is standardised
and in place to give all of the UCI/PUA features, then one could have a 
single entry in ENUM
pointing to that PUA. However, for some time, there will be SIP systems 
(or H.323, just to be
non-denominational) that do not provide full PUA functionality, and for 
the foreseeable future
(i.e. in the interim) just using ENUM (and standard DNS) alone works 
for me.
I don't need anything more complex.

My point is just that I believe that it will work for more than 10% of 
the Registrant population.

all the best,
  Lawrence


On 8 Jul 2004, at 16:51, Mike Hammer wrote:
> Lawrence,
>
> Do I understand correctly that ENUM points to your sip: address, and 
> that the DNS holds records to go from sip address to IP address to 
> make the connection to your SIP proxy?
>
> I would anticipate also the possibility that the domain name of your 
> SIP address could be provided by either a residential SP or your 
> company acting as SP.  I assume that you are also getting the IP 
> address from your local ISP serving your home, although I'm a bit 
> fuzzy on what type of local access you might be using to  connect to 
> the ISP (modem, DSL, cable?).
>
> Note that I consider enterprises/companies as service providers, 
> though not publicly regulated ones.  And while they could also make 
> use of ENUM, they might question the value versus risk of putting 
> their company directory into the public domain.  I suspect that they 
> would want to keep that information internal and only selectively 
> release such information.  However, the before-mentioned suggestion to 
> provide a SIP proxy domain such that SIP messages to 
> sip:<e.164number>@company.com that can use an internal database to 
> translate to user-specific sip address can be used.
>
> When presence becomes more widely deployed, ENUM could point to the 
> presence address for subscriptions.  Then presence information could 
> provide the remaining information that would otherwise be publicly 
> posted in ENUM.
>
> Mike
>
>
> At 11:27 PM 7/7/2004 +0100, Conroy, Lawrence (SMTP) wrote:
> > Hi Mike, folks,
> >   Is this 90% valid?
> > <snip>
> > Thus, whilst you may be right on the total population of PSTN 
> > telephone service subscribers, I'm not sure this is the case for the 
> > population of "user" ENUM subscribers.

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