Log in to admin
click on "inbound" in the left menu
click on "filter phone groups"
And create one ...then apply it to any DID and ... voila! (Wish Granted!)
If you want an "override", you can also modify the "trunkinbound" context of extensions.conf to check for the inbound callerid and kill the call before it even arrives at Vicidial ... but that's a lot more work.