You will need to reset the number of rings on your fax machine to ensure it picks up before the call is forwarded to Voice Mail. You may also call 1 888 423-2333 to change the programmed number of rings before an incoming call is forwarded to Voice Mail.
If you have a fax machine, consider subscribing to Smart Ring. Smart Ring allows you to have two numbers programmed on one line, each with a distinctive ring. With Smart Ring, you could determine whether an incoming call is a fax, or someone trying to reach you.