I sure wish we could silence the ringer for "unknown" callers or those who block caller ID.

I have all of my regular callers (family, friends, coworkers, etc.) categorized by ringer tones. This is EXTREMELY helpful, since our beloved I-500 doesn't have an external display.

I want to silence and/or send immediately to voice mail those calls from RUDE people who block their numbers. Any ideas? Thanks in advance.