3Com Courier, Reference

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Carrier Loss Redial 5-3
Carrier Loss Redial
You can set the Courier V.Everything modem to redial the last-dialed
number after it loses carrier (carrier is the signal maintained between two
modems while they are on line). This feature is useful for dialed-lin
connections that operate unattended.
Example: Sending
ATS44=20
sets a 20-second interval between losing
the connection and redialing.
Answering Call
Your modem can be configured to answer calls. By default, your Courier
V.Everything modem will not automatically answers calls
Dial a number, wait 60 seconds for a connection, and
then hang up. Wait two seconds, then redial. Make a
maximum of 10 attempts.
To stop the repeating, press any key during the pause
between dial attempts. If you press any key while the
modem is dialing, that dial attempt is canceled but the
cycle will continue
>
Dial the last-dialed number and repeat it just as the >
command does. Also can be used to repeat any
command.
A>
For your modem to Command
For your modem to Command
Disable carrier loss redial
ATS69.1=0
Enable carrier loss redial
ATS69.1=1
Wait n seconds between losing the connection and
redialing.
This command also defines the interval (in seconds)
between dialing attempts if the first attempt is not
successful.
ATS44=n