Apple Express Fax/Modem - Manual (Page 30)

10 Choose Open Connection from the Session menu.
Selecting Open Connection is the same as lifting up the receiver of your
telephone. Depending on the software application you’re using, you should
be able to hear the modem dialing the telephone number for you if you have
entered a phone number. If you can hear a dial tone and the modem dialing
the telephone number or a busy signal, you’re properly connected to the
telephone line.
18 C H A P T E R T W O