Hello Giuseppe, from my point of view all we need is a logical OR (||) in this systemd unit. Unfortunately I couldn't find such an option in systemd's manpages. So, I gave it a shot and tried this:
[Unit] Description=HylaFAX faxgetty %I BindsTo=iaxmodem.service || dev-%i.device After=network.target Well, it works as expected: The devices come up and if I stop iaxmodem.service manually, all faxgetty services are immediately terminated as well. If I start faxgetty again, iaxmodem.service is started automatically. This is just for the iaxmodem part, I couldn't test with a real serial modem though. The After line is to make sure iaxmodem.service is running if faxgetty wants to start an iax device. But, again, I am not sure if this logical OR is officially supported by systemd. Tino
