I guess the joke is on me for not making it clear that it needs to be a software trigger
I have Magicall set up to automatically hang up on a lot of calls (10-15/day), and it would be best if the phone were to go into standby mode immediately after that to 1) save battery power and 2) not force me to look at the phone every time I get one of these calls.
Works great w/ xdaShutdown and Magicall 2.22.