[VoiceOps] Preventing calls to cell phones with guaranteed accuracy

[James Milko]

On Tue, Aug 25, 2015 at 11:49 PM, John Levine <johnl at taugh.com> wrote:

> >> most landline carriers won't port it to a landline if it's out of
> >> ratecenter.
> >
> >I thought ports were only possible within a rate centre, and so by
> >definition impossible to port to a carrier which doesn't operate in that
> >rate centre?
>
> It is my impression that ports are technically possible anywhere
> within a LATA, but for business reasons most telcos won't port between
> rate centers.
>
> They're definitely not possible across the country because long
> distance calls only do the LNP lookup after routing the call to
> the destination tandem.  (That's the "L" in LNP.)
>
>
Usually this is because their numbers can't support nomadic 911.
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