Apple Express Fax/Modem - Manual (Page 125)

Using AT commands
A command example is:
AT&Q5DT2125556767
This command line instructs the modem to attempt a V.42 bis connection,
and then dial the number (212) 555-6767.
In this example, the modem’s command line interpreter—the AT command
set—issues instructions to the modem. If you look up these commands in this
appendix, you will find:
AT The attention command
&Q5 Attempt V.42 bis connection
DT Use Touch-Tone dial
212… Make this string the dialed number
Entering AT commands from MacTerminal
If you have MacTerminal, you can enter AT commands as follows:
1 Choose Connection from the Settings menu.
The Connection Settings dialog box appears.
2 Select the Express Modem.
The lower half of the dialog box changes.
113 M O D E M C O M M A N D S E T