[VoiceOps] Preventing calls to cell phones with guaranteed accuracy

[Alex Balashov]

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.

-- 
Alex Balashov | Principal | Evariste Systems LLC
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