I can't think of a better way off the top of my head. They would not know if the alarm bell button was ringing or not.In this case the person who picks up the other end of the phone will clearly hear 'knock-knock-knock' pause, 'knock-knock-knock' and the deaf person can be reasonably sure hitting the receiver on the door will be making a noise. I hope the phone has a visual indicator it is working, but perhaps that is the reason for specifying the door, if the phone is not working at least the sound can be heard outside the elevator.If the phone is not working the deaf person is no worse off than a non-deaf person who would know the phone wasn't working and then.... start banging on the door.
Cue for a song. ...twice on the pipe if the answer is no.
Ah, here it ishttp://www.youtube.com/watch?v=YckbSrRsZyU(Giving away my age here)
I was listening to that very song while writing this post!
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