Infinite Voice extends the range of your e-mail system. You can listen,
forward, and respond to messages using a standard touch-tone telephone. Even
send messages to a fax machine for a remote copy. It provides all users of
your network e-mail system with remote access without having to invest in a
laptop for each person. Many users have occasional need for remote e-mail
access. Even users who travel regularly might find it easier to check
messages from the convenience of a touch tone telephone. Reading and
responding to e-mail messages becomes simpler and available to more people.  

    http://www.infinitemail.com/infinite/prods/ivoice/ivoice.html

