T-Fax 360 ISDN¶
This is an ink-jet Fax machine sold in Germany by the incumbent operator, Deutsche Telekom.
While it offers ISDN instead of POTS connectivity, it is not a G4 Fax. Rather, it is the analog G3 T-Fax_360 with a built-in TA a/b, i.e. a small analog to ISDN converter.
Configuring the Fax works over the LCD and the various buttons. However, configuring the built-in TA works rather awkward by dialing certain sequences of digits / codes while disconnecting the ISDN uplink. Apparently they really didn't want to touch the actual Fax at all, i.e. no firmware changes for setting the ISDN config like MSNs via the LCD.