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Chapter 5 – Callback Security
Multi-Tech Systems, Inc. MT9234ZBA-Series User Guide (S000387D) 15
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.
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 E
NTER. For odd parity, type AT#CBP1. Press ENTER.
4. To store the new parity value, type AT&W. Press E
NTER.
Assigning Callback Passwords and Phone Numbers
1. Open a data communications program such as HyperTerminal.
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 E
NTER.
4. To store a callback password for the first callback memory location, type AT#CBN0=xxxxxxxx, where xxxxxxxx is
the first password. Press E
NTER. 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 E
NTER. 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 are entered.
7. To store a callback phone number in the first memory location, type AT&Z0=[+][-]ATxxxxxxxx[,???], where xxxxxxxx
is the dialing string. Press E
NTER. 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: AT&Z0=+-ATM0DT5551212. Up to 35 characters can be used. The +, -, and ??? characters are optional:
+ 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 E
NTER. Note that the memory location number in the command is
incremented by one.
9. Repeat, through memory location 29, until all dialing strings are entered.
10. To review your entries, type AT&V and press E
NTER.
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.