gr8twhtd0pe,
You can block calls based on Outside Party Number with the base system, but not Outside Party Name. If you know what the numbers are then you just need to create a Call Routing Table and change the Call Routing Key to Outside Party Number. Then inside the Call Routing Table you would put in the 10-digit number that you are receiving calls from that you want to block.
I normally create a Call Routing Announcement that just hangs up on them after playing a message about blocked Caller ID not being accepted.
Thanks,
TE