At some point a few months ago, my phone (Moto X 2nd gen, fully up-to-date) started dropping all incoming WiFi calls at work. Basically, when I swipe right to answer on the incoming call screen, it hangs for ~3 seconds, and then hangs up and says “Call ended.” Since I work for a major public university in a building that has its WiFi network managed by IT, I suspect it has something to do with ports/another setting I can’t access. When I’m on other WiFi networks (at home, at stores, etc.), I have no problem answering calls.
For lack of a better solution, I’ve decided to use a firewall app to block WiFi calling when I’m at work. I used this approach about a year ago when I was having other issues, but eventually stopped using it when most of the problems had been fixed.
Any other ideas or suggestions? Thanks for your help!