Yes. I've even held the handset and pulled the line cord out of the wall and it still does it. I know the phenomenon that you're thinking of, and it isn't that. It sounds like feedback, but the screech is very consistent in length and pitch. The only clue is it only happens when paging from a SLT. Any SLT. It has to be something to do with the Partner itself, since I never had this problem with my R6