I used to have a way of doing this when I used an old PowerBook 2400c with a PCMCIA card modem. I don't remember what the software I used was - there was a similar program (for Mac OS 7) called Mega-Phone that a friend of mine used, so I at least know it's possible. Mega-Phone allowed you to use your computer as an answering machine that way; I guess you might try searching for "answering machine" software.
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I am really not sure of anyway that this could be accomplished. The only possible way would be to use a program called audacity, which can record sounds being played on the computer. This would only work if your voice is played back so you can hear it while talking.
. Depends on which modem is used - check the owner's manual. Probably not possible with an external serial modem.