Let me just further confirm that yes, this IS the number that shows up from any of the bazillion phone lines here at Froedtert (I know, I'm employed here).
Why someone at Froedtert is calling you on a Sunday night, Rosie, is anyone's guess, but it may be a good idea to answer it. Just sayin'.
Anyone calling with this number is calling from Froedtert hospital. I also work there and when I call from anywhere in the hospital even patient rooms this number shows up.