@jeder@aetios If the printer has fax built in and an analog phone connection you need some sort of device (Cisco ATA's or a fritzbox can do this) which connects to the EPVPN SIP network (over ip) and then has an analog phone connector to connect the multifunction to. Tho if you are using a fritzbox it has a virtual fax built in. I guess there's also linux software available which can do this over SIP
@jeder@aetios We are using EPVPN instead of an actual phone network/provider because it's free. It's just a private "network" where people can connect to.