I take it this happens when you call your home phone from a different phone.
If that's the case, check in "Printers and Faxes" to see if you have a
printer called "Fax".  If you do, right click the Fax printer icon and
select "Properties", go  to the "Devices" tab, click the modem shown in the
"Device Name" window to highlight it, and click the "Properties" button.
Click the "Receive" tab and check which radio button is selected in the
"Answer mode" section.  If the "Automatic after" button is lit, click the
"Manual" button and click "Apply".  this will prevent your modem from
automatically answering every incoming phone call and will allow you the
option of manually answering.

Hal