[VoiceOps] Preventing calls to cell phones with guaranteed accuracy

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 303 Perimeter Center North, Suite 300 Atlanta, GA 30346 United States Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/