Right now with Google Voice I get a dozen hang up calls per day, it's always from a different number. When I don't answer, Ive got a dozen 2 second long voice mails. I used to spend a lot of time setting these to spam or being blocked, but between Google Voice and Hangouts simply asinine and beyond incompetent integration where some calls show up in Google Voice but not Hangouts and vice versa, I'm losing interest.
So recently I just decided to make the default behavior for the Google Voice number not ring any of my phones or Hangouts, but set up contact groups where friends and family should ring through. Well that's not working, I'm still getting spam and hangup calls, and some friends ring through, others don't, and client calls don't.
It's really craptastic.