ZyXEL Communications 128IMH manual Clid Authentication, Callback

	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 Time-	Enter the idle time (in seconds). This time-out determines how long the dial-in	Default=300
out	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-In Server Configuration 8-11