ZyXEL P-128 User Guide - Page 119

CLID Authentication, 4.2 Callback

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Prestige 128IMH ISDN Modem/ Router/Hub Table 8-4 Edit Dial-in User Menu Fields (continued) Field Description Option Rem CLID If you enable CLID Authen field in Menu 13, then you need to specify the telephone number from which this user calls. Your Prestige wil check the CLID in the incoming call against the CLIDs in the database. If they do not match and CLID Authen is Required, your Prestige will not answer the call. Idle Timeout Enter the idle time (in seconds). This time-out determines how long the dial-in Default=300 user can be idle before your Prestige disconnects the call when the Prestige seconds is calling back. Idle time is defined as the period of time where there is no data traffic between the dial-in user and your Prestige. The default is 300 seconds (5 minutes). Once you have completed filling in Menu 14.1 - Edit Dial-in User, press [Enter] at the message [Press ENTER to Confirm...] to save your configuration, or press [Esc] at any time to cancel. 8.4.1 CLID Authentication CLID (Calling Line IDentification) authentication affords you the security of limiting a user to only initiate connections from a fixed location. The Prestige uses the caller ID sent by the switch to match against the CLIDs in the database. Please note that for CLID authentication to work on the Prestige, your telephone company must support caller ID. You must also include the AT command in the [initAT] string in Menu 2 to enable caller ID detection on the modem. 8.4.2 Callback Callback serves two purposes. One is security. When set to callback to a fixed number, an intruder will not gain access to your network even if he/she stole the password from your user, because the Prestige always calls back to the pre-configured number. The other is ease of accounting. For instance, your company pays for the connection charges for telecommuting employees and you use your Prestige as the dial in server. When you turn on the callback option for the dial-in users, all usage is charged to the company instead of the Dial-I n Server Configuration 8-11

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Prestige
128IMH
ISDN Modem/ Router/Hub
Dial-In Server Configuration
8-11
Table 8-4 Edit Dial-in User Menu Fields (continued)
Field
Description
Option
Rem CLID
If you enable CLID Authen field in Menu 13, then you need to specify the
telephone number from which this user calls. Your Prestige wil check the
CLID in the incoming call against the CLIDs in the database. If they do not
match and CLID Authen is Required, your Prestige will not answer the call.
Idle Time-
out
Enter the idle time (in seconds). This time-out determines how long the dial-in
user can be idle before your Prestige disconnects the call when the Prestige
is calling back.
Idle time is defined as the period of time where there is no data traffic
between the dial-in user and your Prestige. The default is 300 seconds (5
minutes).
Default=300
seconds
Once you have completed filling in Menu 14.1 - Edit Dial-in User, press [Enter] at the message [Press
ENTER to Confirm…] to save your configuration, or press [Esc] at any time to cancel.
8.4.1 CLID Authentication
CLID (Calling Line IDentification) authentication affords you the security of limiting a user
to only initiate connections from a fixed location. The Prestige uses the caller ID sent by the
switch to match against the CLIDs in the database.
Please note that for CLID authentication
to work on the Prestige, your telephone company must support caller ID. You must also
include the AT command in the [
initAT
] string in Menu 2 to enable caller ID detection on the
modem.
8.4.2 Callback
Callback serves two purposes. One is security. When set to callback to a fixed number, an
intruder will not gain access to your network even if he/she stole the password from your user,
because the Prestige always calls back to the pre-configured number.
The other is ease of accounting. For instance, your company pays for the connection charges
for telecommuting employees and you use your Prestige as the dial in server. When you turn
on the callback option for the dial-in users, all usage is charged to the company instead of the