question

any helpers?

It would be nice if there was an update on this feature. I don't understand what is so difficult writing a query: if the numeral count is greater than 11 reject the call. thus blocking inbound non-North American calls.
I see there has been no activity on this post in over a year. blocking individual numbers is pointless with the scammers using other VOIP systems to spoof caller ID numbers making in pointless to block individual numbers when the same call bank calls in the same 5 min span from two different numbers. In addition, as previously stated the formatting is different but that should not preclude the numerals from being counted; a US number is always 11 digits.

Hmmm...have you tried blocking the country code(s) from the Super Admin extension?