Consider the following scenario: fax server should be 2012R2 (64bit) a Hyper-V Windows Server; Problem with virtual machines: No hardware can be installed (missing PCI bus for AVM B1 card) This problem should be solved by means of USB device server via (Silex) this external ISDN modem. The USB connection to the modem managed automatic updates of Windows Server 2012, however, have found nothing. A friendly staff of AVM then told me that the last of these modems from AVM was built in 2007, and therefore already END OF SUPPORT ARE !!! In his goodwill, he offered me a link to Windows Vista drivers (also 64 bit) to the device, and the tip to extract the 8-installed Windows on Windows Update driver somehow, and to taste under Server 2012 ... Well what to say? The tip with the Windows8-drivers I have only tasted not at all ... The modem works almost without complaint with the Vista drivers, and my fax server is running parallel to 2 ISDN channels without a murmur, in and out, of course! Hopefully the part niiiieeemals broken, at least not going as long as there ISDN PRI / installations are connectors! Conclusion: Although your buys a "new device", which has however left the band at AVM before 8 (!!) years. I wonder what kind of a trader actually holds the (thankfully) soo long virgin at the camp ....