How to conduct a telephone network?

Question

Telephony

It is necessary to solve a couple of issues on the creation of a local telephone network in the village.
Description of the project:

We, the poor things, ripped off by mobile operators, are tired of paying terrible amounts of money, so we decided to build an internal telephone network. And not only because of the prices, but also because we are bored here, we want something new.
The star in the image marks the house where the automatic telephone exchange will be located.
So the questions

1. Is VinTelecom SV308 ( https://m.aliexpress.com/item/422820368.html ) suitable for this?
   
2. Which cable to take, and how to strengthen it?
   

We need to rely on a minimum budget, since everyone here is greedy and harmful, except for our family, of course. We are kind and nice.
By the way, legal issues do not interest me.

Answer 1

Do you have Internet access at home?
If there is, then why pull something? Look towards VPN and IP telephony.

Answer 2

If you will provide local communication services for some money, then you need a license to provide MTS services without collective access. Look better in the civilian radio range, much more convenient.