Broadcast a signal from a mobile phone to a landline. Is it possible to?

Question

Iron

Good evening!
There is a kind of shower cabin, to which you can attach a phone, or rather, it is a phone in itself. Those. there is a wire with a regular phone jack. This miracle of technology stands in the country and there is no telephone there by definition. But there is a mobile phone that is lying there all the time and pretends to be stationary. Is it possible somehow from a mobile phone to broadcast a signal to the cockpit? You just need to be able to answer calls and speak accordingly. Maybe there are some adapters for such purposes? Any options will do, but of course something as wireless as possible is better.
PS: In this kind of pieces of iron - a complete layman, do not kick.
PPS: Yes, I know that this is not much needed, it's more of a scientific interest :)

Answer 1

Take the bluetooth and solder the microphone speaker to the handset from the stationary + solder additional power there?

Answer 2

Buy a device, such as Planet VIP-281GS (not necessarily this one - I just remembered offhand, in fact, there are just a lot of manufacturers of similar equipment ..) and enjoy life!

Answer 3

In fact, if you don’t need a dialer, but a banal handset + accept a call, end a call, then why is it not suitable to irritate a banal wired headset in order to make an adapter for a shower tube from it?

Answer 4

Option number 1. gsm bridge. for example
Option number 2. bluetooth headset in the form of a regular phone. For example