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Chapter 5 – Callback Security
16 Multi-Tech Systems, Inc. MT9234ZBA-Series User Guide (S000387C)
Calling Procedures
Use the following procedures to call a modem that has callback security enabled. Note that Autoanswer must be enabled
on the calling modem (S0=1).
Password-Only Callback
Use this procedure when calling from a fixed location.
1. Using a data communications program such as HyperTerminal, dial the number of the callback modem.
2. When the connection is established, the callback modem responds with the following message:
Password>
3. Type the password corresponding to the phone number for your modem. Press ENTER. You have three attempts
or one minute to enter a valid password.
4. If the password is valid, the following message appears, and the modems disconnect:
OK Disconnecting
5. After the delay specified by the #CBDn command, the callback modem calls the number associated with the
password. If the callback modem is unable to establish a connection, it tries again, up to the number of attempts
specified by the #CBAn command.
6. After the modems reconnect, the following message reappears:
Password>
7. Type the same password that you used to initiate the call. You are allowed three attempts to enter the
password, after which you will be disconnected.
8. If the password is valid, the following message appears and the modems establish a working connection:
OK Connecting
Number-Entry Callback
Mobile callers should use this procedure when calling from a phone number different from that stored with the password.
The password that is used must be set up for optional number-entry callback.
1. Using a data communications program such as HyperTerminal, dial the number of the callback modem.
2. When the connection is established, the callback modem responds with the following message:
Password>
3. Type a number-entry password, press the plus key (+), type ATDT and the number to call back to, and press
E
NTER. You have three attempts or one minute to enter a valid password.
Note: When you type your phone number, be sure to include the long distance and area codes if they are
needed.
4. If the password is valid, the following message appears, and the modems disconnect:
OK Disconnecting
5. After the delay specified by the #CBDn command, the callback modem calls the number that you entered after
the + character. If the callback modem is unable to establish a connection, it tries again, up to the number of
attempts specified by the #CBAn command.
6. After the modems reconnect, the following message reappears:
Password>
7. Type the same password that you used to initiate the call. You are allowed three attempts to enter the
password, after which you will be disconnected.
8. If the password is valid, the following message appears and the modems establish a working connection:
OK Connecting