unfortunately, the canadian, carribean, and other area codes are mixed in pretty well with the US area codes.
A not so elegant way to do what you want -- but it works -- is to create a route pattern for each of the other country area codes & choose the "block this pattern" option...
You can get a current list of area codes under NANP from http://www.nanpa.com/ -- somewhere under the "numbering resources" section you can download an access database of all area codes. I counted about 80 or so non-us in use codes in the list -- if you stare at it long enough, you might be able to find some patterns to condense the number of blocked route patterns down a little.
so a route pattern would look like: 9.1264xxxxxxx and you'd choose to block that pattern. 264 is Anguilla, for instance.
All this is assuming you can't or don't want your PSTN provider to block those calls for you -- you might be able to hand them a list of area codes & tell them you don't want anyone making calls to those area codes. In that case, you would just have one route pattern that you route -- 9.1XXXXXXXXXX -- and if the users dial somewhere they shouldn't, the telco will drop it for you...
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