Because the prank answering machine was ABOUT being trapped int he elevator so it would have to have someone trapped in there for it to work

I tried to read as much of the comments as I could but I just didn't see it - Can SOMEONE please explain to me the whole "Mallory's phone routing to the Elevator" thing? Did Archer rig the elevator to trap Mallory as a joke and forget? Or has he just always used the elevator phone as his prank answering machine for…

These reviews are getting more and more disappointing - no discussion on
Rick not only copying Gareth's line "You can't go back, Bob", but him
recognizing the phrase from somewhere right after he says it?