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Daniel Hunziker wrote: Can I use FlexFax over ISDN with an Indy Chalenge S ???? FlexFAX is outdated and the current version is HylaFAX v4.0pl1; HylaFAX has only support for modems connected to an RS-232 interface to a Unix with a "normal" async driver showing the RS-232 as /dev/.... character device; the modem must "speak" class 1, 2 or 2.0 commands; You can also use ISDN modem/TA hybrids (like the ZyXEL Elite 2864I) if these devices are connected through RS-232 and use AT-commands to control the fax-operation in class 2 or 2.0 standard commands; see also Q3 of the FAQ at http://www.vix.com/hylafax/FAQ/ matthias