I'm not sure about getting this for free. From what I've read with preliminary research on Google, any of the following requires a "call forward on busy" service from your phone provider for them to work (it should cost $1 or $2 per month):
CallWave Internet Answering Machine - Stop missing important calls ($8/month)
Pagoo - Tell Me More ($5/month)
BuzMe - Internet Call Waiting ($15/year)
I don't think you can easily get these services for free, as it might require actively managed network protocols. That comes at a price.
The bottom line? Figure out if you can do this for cheaper than high-speed Internet + similar phone services.
Good luck.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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