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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