Thanks
The law is tight in my country, anything connected to the phone network must be Ctick approved,
even if your circuit is isolated I think.

I thought it a good start for beginners.
To finish it, you'd want a DTMF chip (this is minimal PBP software DTMF),
and decide which of the two ways it will work.

It was a practice, I might get a nicer old phone one day,
but I will go the way of sacrificing a modern cordless handset.
The pic controlling that is a different program.