Re: [Enum] A proposal for Carrier ENUM

["Clive D.W. Feather" <clive at demon.net>]

Pfautz, Penn L, NEO said:
> Nonetheless, I do think that for the most part it will be possible to
> determine who the carrier providing the PSTN point of interface for an
> E.164 number is and thus the carrier-of-record for carrier ENUM. If this
> information were not generally available the E.164 number would not be
> of much use anyway.

In the UK model, the national call routeing system points at the "donor
operator". Calls are routed to that operator, who then adds a prefix to the
number - pointing at the terminating operator - and re-injects the call
into the network to be re-routed. Thus to identify the carrier providing
the PSTN point of interface:
(1) You need to identify the donor operator.
(2) You need to ask the donor operator to indicate whether the number has
    been ported and, if so, who the recipient operator is.

It's (2) that's the hard bit, because there is no mechanism for it and no
commercial or regulatory imperative to create one.

-- 
Clive D.W. Feather  | Work:  <clive at demon.net>   | Tel:    +44 20 8495 6138
Internet Expert     | Home:  <clive at davros.org>  | Fax:    +44 870 051 9937
Demon Internet      | WWW: http://www.davros.org | Mobile: +44 7973 377646
Thus plc            |                            |

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