How to simulate a line for an old telephone set (with ringing support)?

Question

Electronics

There is an old telephone with a rotary dialer.
You need to make a line imitation for it with the following features:

• detection by the controller (for example, arduino) of the removed and hung up handset;
  
• playing sound from a flash drive in line (to be heard when the handset is raised);
  
• activation of a natural-sounding phone call;
  
• recording speech through a microphone on a USB flash drive with the handset raised (not so important);
  
• long battery life in standby mode;
  
• relatively compact size - about the size of a bottle, but this is not so critical.
  

What is needed is an imitation of the line so that the device itself can be left in its original unmodified form.
The gist of the question is:

• what is the easiest way to make a high-voltage ring signal converter?
  
• will it be enough to drive a meander reinforced with a mosfet through a transformer?
  
• Can it be simpler and more compact to use a step-up DC-DC converter to charge a capacitor and from time to time discharge it into a line through a mosfet on a signal from the controller's foot?
  
• What can be pitfalls?
  

Answer 1

Option from the network:
Vehicle Simulator

Answer 2

Do you want an imitation of a line or an imitation of a phone?
If you imitate a phone, then take a microcontroller at least an arduino. Throwing almost all the guts out of the phone, i.e. change the microphone and speaker in the handset to something simple that the arduino will pull out, the handset button remains old, the bell (which is old in the form of 2 mechanical bells) for it, use the converter to alternating current with a certain frequency, the nameplate on the arduino to output and record sound. Coordinate all this with each other and write the firmware.

Answer 3

In the ZTE ZXHN H298A router, there are two mikruls in SOIC8 marked L93B 19B3 (nearby - a pair of DC-DC and a 32260-FM2 controller). But the search for these ciphers together with the word FXS does not give a clear result ... Maybe you will find something in the typical scheme for using Silicon Labs 32260?
As a matter of fact (TA authenticity) - see also the corresponding section of the rt20 forum - rt20.getbb.ru/viewforum.php?f=40 I think they have already found an answer to this.