Blacklist / block callers - an implementation idea

I see several ideas on blocking calls company-wide but here is how I would like to see it implemented.

A blacklist table that after I put in a phone number I can check boxes that block that number from calling, texting, or faxing us. I also want a short description box to type "fax spam" or "harrassing calls" as a description so I know at a glance in the future why we put a block on it.