Re: [Enum] A proposal for Carrier ENUM

[james.f.baskin at verizon.com]

In the UK number portability model, perhaps the donor operator _should_ 
be the carrier-of-record for carrier ENUM.  The donor is, after all, 
the only carrier known to PSTN routing databases for a ported number. 

This could actually work in reasonable ways. 

(1) The donor could populate carrier ENUM with direct pointers to 
    recipient operators' gateways.  Thus, for calls from originating 
    carriers who choose to do a carrier ENUM query, the donor operator 
    could avoid having to handle the prefix and re-injection function.

(2) The recipient operator could use End-user ENUM to populate any 
    other NAPTRs that it might determine to be useful (this would 
    require end-user opt-in, but that could be obtained as part of the 
    original porting transaction.) 

(3) Carrier ENUM could be used to build a number portability database 
    that could eventually eliminate the donor operator's (unwanted and 
    costly?) involvement in PSTN call routing for ported numbers. 

Determination of which party is the carrier-of-record (PSTN POI) is a 
national matter.  Some countries could use the donor model, and others 
could use different models.  The IETF should design Carrier ENUM to work 
regardless and independent of the national carrier-of-record decision.

Jim Baskin


Clive Feather wrote:

>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.



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