Non-Password Auto Call Back Function - ZyXEL Communications ACCESSING INTERNET & INTRANET omni series User Manual

You will be asked for the original password and a new password.
Then re-enter the new password for verification. For example:
Password:
******** (Enter current supervisory password)
Password:
******** (Enter new supervisory password)
Verify:
******** (Enter the new supervisory password again)
OK
Use command AT*Hn to modify the "n"th user password. You will
be prompted to enter the supervisory password first and then the
user's password for this entry will be requested and verified. The
command AT*V will list the 40 user passwords and the supervisor
password on the screen for viewing.

Non-password Auto Call Back Function

In addition to the standard modem-like security functions described
in the previous section, the omni provides another simpler call back
function. The Calling Party Number (origination address) will be
checked against the 5 pre-stored call-back numbers before the B
channel is connected. If the CPN is matched with any one of the
numbers, the incoming call will be rejected (without connection,
hence without any charge) and the TA will automatically call back
using the matched phone number.
This function can be controlled using the following commands:
AT*GC0 - disable the auto call back function (default).
AT*GC1 - enable the auto call back function.
The pre-stored numbers can be set using the following command:
AT*HCn=xxxx, - n=0,1,..,4
You will be prompted to enter the supervisory password first.
The AT*VC command can be used to list all the pre-stored numbers.
96 Security Functions