Chapter 6 - Callback Security
is asked to enter the password again before a connection can be made. Also, dialing command locations
To temporarily disable callback security if the modem is set to #CBS1 or #CBS2 (for instance, to call another modem): Type AT#CBS3 and press ENTER. The modem returns to its original setting when you issue the hangup command (+++ATH) or the modem is reset. Note that if a remote modem breaks the connection, callback security remains disabled.
Setting Callback Security Message Parity
The modem’s password prompt and messages parity must match the parity of the computer to which the modem is connected.
1.Open a data communications program such as HyperTerminal or PhoneTools.
2.In the terminal window, type AT#Sxxxxxxxx, where xxxxxxxx is your password. Press ENTER. The modem responds with OK if the setup password is correct and ERROR if it is wrong.
3.The modem’s parity default value is No parity (AT#CBP0). To change the modem’s default to use even parity, type AT#CBP2. Press ENTER. For odd parity, type AT#CBP1. Press ENTER.
4.To store the new parity value, type AT&W. Press ENTER.
Assigning Callback Passwords and Phone Numbers
1.Open a data communications program such as HyperTerminal or PhoneTools.
2.In the terminal window, type AT#Sxxxxxxxx, where xxxxxxxx is your password. Press ENTER. The modem responds with OK if the setup password is correct and ERROR if it is wrong.
3.Enable callback security by typing AT#CBS1 or AT#CBS2 and pressing ENTER.
4.To store a callback password for the first callback memory location, type AT#CBN0=xxxxxxxx, where xxxxxxxx is the first password. Press ENTER. The password must be unique, must be six to eight characters in length, and must not contain a + or - character.
5.To store a callback password for the second callback memory location, type AT#CBN1=xxxxxxxx, where xxxxxxxx is the second password. Press ENTER. Note that the memory location number in the command is incremented by one.
6.Repeat as many times as necessary, up to memory location 29, until all passwords have been entered.
7.To store a callback phone number in the first memory location, type AT&Z0=[+][-
]ATxxxxxxxx[,???], where xxxxxxxx is the dialing string. Press ENTER. The phone number must be preceded by DT for tone dialing or DP for pulse dialing. The dialing string can also include other AT commands. Example:
+ Number entry. Enables a mobile caller to enter his current phone number for callback.
- Direct connection. Enables a caller to choose direct connection without being called back.
,??? Extension entry. Must be used with the + command. Enables a caller to enter an extension number for callback. The number of ? characters must equal the number of digits in the extension.
8.To store a callback phone number in the second memory location, type AT&Z1=[+][-
]ATxxxxxxxx[,???], where xxxxxxxx is the dialing string, and press ENTER. Note that the memory location number in the command is incremented by one.
9.Repeat as many times as necessary, through memory location 29, until all dialing strings have been entered.
10.To review your entries, type AT&V and press ENTER.
Note: A form is provided on the last page of this chapter to help you plan or keep track of password and phone number assignments.
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