USRobotics NETServer/8 - Manual (Page 53)

IP Terminal Server Setup 4-11
Step 3 - Configure for dialback use?
Normally, after a user enters his or her user name and password,
the connection to the host proceeds. When a dialback user
enters his or her user name and password, the NETServer hangs
up and dials the user back. To configure a dialback user, type
the following command:
set user <name> dialback <number >
<number> can be any valid string of up to 32 characters. If you
want to use AT commands in this string, begin the string with
“AT”. Otherwise, the NETServer will expect only a phone
number.
The two lines below actually do the same thing. The difference
is that other AT commands could also be inserted in the second
line.
set user smiley dialback 5551000
set user smiley dialback atdt5551000
To clear the dialback entry and return the user to normal dial in
service, type the following:
set user <name> dialback none
Step 4 - Save your work
Type the following command:
save user