Not done any on the amiga, other than setting the modem to dial 1471 and listening to it through the modems speaker, but back around 2001/2 ish I used my WinModem on Windows 98 to make/recieve phone calls a few times. I just used speakers/microphone plugged into the soundcard and the modem had a cable that connected it to the soundcard.
The software (BVRP PhoneTools) also had the ability to fax stuff as well as an answering machine.
Can't remember whether I faxed stuff from PhoneTools but I certainly did using Microsoft Outlook. I still have an answering machine file (wav file) from PhoneTools.
