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If you unscrew the device from the wall (the two screws on either side of the speaker) you will see the modest innards. Fold up some paper and wedge it against the cone of the speaker, between the cone and frame of the speaker, to inhibit its movement. There are 4 "arms" there and you can try just cramming something in there under just one of them, or more. Be careful not to tear the cone.
A possible side effect will be a reduction of the volume when you're using the intercom function to talk to whoever is pushing the button. If that function becomes unusable, you can remove what you crammed in there. Good luck!
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