What is the thing that resembles a camera shoe under the handset holder found on telephones with a handset used for?
I have noticed phones with a handset (like the one in the image) have a little cover that resembles something like a cold camera shoe under the bottom of the handset's top speaker holder. Is there a use for it? It has a line bump in the middle, but it doesn't go all the way from both sides, it leaves a gap. I have also seem some of them have extra space on the top of the cover, and some don't.
English is not my first language and I don't understand what camera shoe mean. But I think I know what you're asking for. That phones can be mounted on a wall and what you're asking for is there so the handset doesn't fall off.
Edit: note that this is a "hot" shoe because it has contacts that can power accessories. A cold shoe is just a mount. You can use to to attach a flash or a microphone for example