I think you should say to your husband "Some psycho left a rather obscene voice-mail message for me on my business line, which I really don't appreciate. I'm in the process of finding out who it is, but I thought you should be aware."
Watch his reaction very closely and remember every detail on his reaction. Watch his facial reactions. Watch his body language. Let us know how he responds.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712