Something to think about WRT India is the telegraph wiring was designed for non-electrified areas, it works fine with one giant chemical battery in the main off

Something to think about WRT India is the telegraph wiring was designed for non-electrified areas, it works fine with one giant chemical battery in the main office, basically all the keys and sounders are in electrical series. Old fashioned copper gravity batteries instead of modern power supplies and things like that. Some rural areas of India are only 80% electrified. I suspect power could be an issue. In the US, power companies love pulling in fiber with their cables, both for internal SCADA control and resale. No point sending out two cabling crews along two paths... so places that tend to have power tend to have fiber connectivity. It might be similar in India. So no fiber because its a rural area with no power lines and eventually they'll get both at the same time.