This Automated House
This Project will start simple and evolve into something very complicated in the end.  Here's the long and short of the simple version:

Basically, I prefer not to take calls after 9 PM, nor to have calls placed after said time.  Every phone in the house with the exception of two (bedroom and den) run through a main junction block which is switched via a UM506.  I'm careful not to kill all the phones in the house as I want to get out in the case of an emergency. 

Also, the macros from a smoke alarm trigger enable all phones.