How am I expected to enter these AT commands without resorting to some DOS-based terminal program?

Frequently Asked Questions for FreeBSD 2.X : Serial Communications : How am I expected to enter these AT commands without resorting to some DOS-based terminal program?
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11.11. How am I expected to enter these AT commands without resorting to some DOS-based terminal program?

Make what's called a ``direct'' entry in your /etc/remote file. For example, if your modem's hooked up to the first serial port, /dev/cuaa0, then put in the following line:

            cuaa0:dv=/dev/cuaa0:br#19200:pa=none

Use the highest bps rate your modem supports in the br capability. Then, type ``tip cuaa0'' and you'll be connected to your modem.

If there is no /dev/cuaa0 on your system, do this:

            cd /dev
            MAKEDEV cuaa0

Or use cu as root with the following command:

            cu -l``line'' -s``speed''

with line being the serial port (e.g./dev/cuaa0) and speed being the speed (e.g.57600). When you done entering the AT commands hit ~. to exit.