There are two places that this can be done. The first and easiest is the first time you encounter a room with a telephone. Ring the phone and it will lure a haunted into the other room next to the one you're in. Sneak to the door outside and close it while the haunted is inside and the trophy will pop.
The last chance to get this is in the room with two haunted. You need to sneak into the middle of the room and ring the phone which will lure one of the haunted into the room off to the side. Just close the door and the trophy will pop.
I'd recommend the first chance to do it as the second chance is a bit harder to pull off.