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The digital System Phone ST 42 is for the connection to an internal S0-Bus or an Up0-Connection of an AGFEO ISDN Telephone System. The ST 42 may be connected to the following AGFEO ISDN Telephone Systems: TK-Home Server with Firmware 2.339.15 or higher, AS 151 plus, AS 181 plus, AS 181 plus EIB with Firmware 8.5a or higher, AS 281 All-In-One, AS 35, AS 35 All-In-One with Firmware 8.5a or higher, and AS 40 P (P400-1).