[VoiceOps] Preventing calls to cell phones with guaranteed accuracy

[Paul Timmins]

On 08/25/2015 04:22 PM, Alex Balashov wrote:
> That's exactly right. There's no way to clean up a list "by" NPA-NXX. 
> You need to know where the call is going to go, which cannot be 
> determined from the number itself[1]. So, you still need to do an LNP 
> lookup to know which prefix the number is "genuinely' affiliated with.
>
> [1] Except for nonportable blocks/areas.
>
As I explain to my customers, you can absolutely use my data to do the 
initial scrub. LNP dips tend to cost money per dip, so taking the 
obvious cell phone blocks out first saves you time and money. But you 
MUST do the next step and scrub them after dipping too.

-Paul