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7-2 CHAPTER 7: PLACING AND RECEIVING CALLS
Placing Calls Automatically
If you are using standard communications software, select
the 3ComImpact IQ ISDN modem. If the 3ComImpact IQ
ISDN modem is not listed, select a Hayes
®
-compatible
modem configuration and dial out through the 3C882 ISDN
modem. If you are using a Hayes-compatible modem
configuration, you may have to manually configure settings
such as baud rate. Refer to your communications software
documentation for more details.
Placing Calls Manually
You can place calls manually using AT commands. Your
communications software must be in terminal emulation
mode.
Follow these steps to use AT commands:
In most situations, an initialization string is not necessary
with the 3C882 ISDN modem. If an initialization string is
required by the communications software or server, use the
Hayes default initialization string.
1 Launch your communications software.
2 Be sure the 3C882 ISDN modem is in command mode
(sometimes called local mode or terminal mode) so that it
interprets your commands.
When your computer is powered on, the 3C882 ISDN modem
automatically starts in command mode. If you have recently
used the 3C882 ISDN modem to make a call and have not yet
disconnected, type +++ to switch to command mode.
3 Type:
AT D <telephone number>
The 3C882 ISDN modem recognizes the AT command ATD to
dial a digital ISDN data call. Correct examples of outgoing