I've managed to block Single callers from calling in to the system at other sites but this site that we've done keeps getting attacked where they are trying to get in the voicemail (its fully locked down so it can never dial out). Sometimes the phones are showing +987############ (a bunch of numbers) it changes every time different number inbound. They have an Auto attendant so thats where they are attacking. Our provider wont block countries only certain numbers and thats after a battle.

The Question I'm asking is, is it possible to block certain Countries from calling in?