phone fun, was GeoIP database issues and the real world consequences
johnl at iecc.com
Wed Apr 13 21:40:25 UTC 2016
> And further to that, throw in Local Number Portability (LNP) and you
> really need to know the full number in order to know which switch the
> specific number is assigned to. Not all 408-921 prefixed numbers will go
> to that switch in West San Jose.
Right, like I said three messages ago but that some people seem to
NANP geographical numbers can be located to a switch (give
or take number portability within a LATA),
> A phone number, like an IP address, can only imply a physical location. It
> is not a guarantee, and that hint can range from moderately accurate to
> wildly wrong.
Quite right. US mobile carriers let you take your phone number
anywhere in the country, so people do. There's also a fair amount of
VoIP where again the phone need not be anywhere near the switch -- I
have landline phone numbers in NYC, Santa Cruz, Monreal, and Cambridge
UK, and don't live in any of those places.
Bonus question: is there any way to find out whether and where a
number's been ported without spending telco level amounts of money?
Free would be nice.
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