Hi, > do you know if its possible to answer incomming calls with this > solution, so that one can build an isdn-fax-server with it? if you use a TA which supports the fax-class-commands, yes. the cheap ones do not support this. you need the top-model with integrated dsp for analog modem and fax emulation in hardware. check the websites of zyxel and 3com for example. bye, siggi.