Ray Bellis wrote:
> (http://www.ietf.org/internet-drafts/draft-iab-dns-applications-00.txt)
>
> Send-N is not only intended for open number plans, it's intended
> for use in _any_ plan with variable length telephone numbers.
Such a mechanism simply does not work when:
<draft-iab-dns-applications-00>
In these
plans, a telephone switch ordinarily cannot anticipate when a dialed
number is complete, as only the terminating customer premise
equipment (typically a private branch exchange) knows how long a
telephone number needs to be.
where even telephone switches (thus, telephone operators) do not have
any knowledge on how many numbers should be dialed.
> It came out of the proposed specifications for the UK local number
> portability database, where E.164 numbers vary from 8 to 12 digits
> in length.
If the number portability database operated by telephone operators
can eve exist, it is impossible that CPEs operated by subscribers
determine the length of telephone numbers.
Masataka Ohta
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