I dragged out a Cisco (Linksys) SPA3102 and finally got around to setting up Asterisk at home. The final motivation? Easy “routing” of annoying (800|866|877|etc|no caller id) callers straight to voicemail. Despite being on all the “do not call” lists I still get too many (= some) unsolicited calls representing entities rather than people I know. My new crazy complicated answering machine can now route them straight to voicemail where they will not leave a message but also not ever ring my actual phone.
I don’t just blacklist them outright because once and a while one of those suspicious looking numbers is actually a call I want (“Dear Ken, Is it really you buying all this shiny? —your credit card”) but all of those DO leave messages.