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@evgandr Makes sense now! I thought you used wired phones, but it's because of the icons of the schematics. But, yeah, with smartphones, it's easier!
I saw some Digium cards on the equivalent of ebay in France, but I wanted to try an ATA first (sadly, it's locked as often for Cisco / Linksys SPA2102....). Thanks for the feedback 
@evgandr Nice setup! I'm interested to build something similar with a VoIP adapter to use old analog phones, but I have a question while reading your schematics : the phone 1 and 2 are connected through others ISPs, but are they directly connected to the ISP box or to a small computer that can connect to Asterisk ?
I'm a newbie in this field, so I might miss something
