Chapter 6 – Callback Security
Multi-Tech Systems, Inc. MT5600BA-V92 User Guide 35
Calling Procedure
Use the following procedure to call a modem that has callback security enabled.
Autoanswer must be enabled on the calling modem (S0=1 or S0=2).
1. Using a data communication program such as HyperTerminal, dial the number of the callback
modem. When the connection is established, the callback modem responds with a request for a
password.
2. Type the password for your modem, and then press ENTER. You have three attempts to enter a valid
password or be disconnected.
3. If the password is valid, the callback modem disconnects. Then, after a short delay, it calls the
number associated with the password and establishes a working connection.
Note: If you are calling a direct connect number, you must append a hyphen (-) to the password.
If the corresponding phone number has - as its first character, you will be able to go
directly online with the callback modem. If the corresponding phone number has no -
character, you will be prompted for a different password.
4. Press , to go to the ENTER NUMBER #2? LCD.
5. Repeat steps 3–7 to enter the next number.
6. Repeat as many times as necessary, up to memory location 30, until all numbers have been entered.
Warning: There is no way to review an entry to confirm that it has been entered correctly. If you
attempt to look at a number entry by pressing the Enter button for an ENTER NUMBER #n?
LCD, it is possible for you to accidentally erase the entry.
Callback Security Commands
The following AT commands are used with callback security.
Enables or disables callback security. When callback security is enabled, phone
number memory locations 0–4, used for quick dialing and DTR dialing, become
unavailable and are replaced by callback security memory locations 1–30. The phone
number memory locations and their contents are restored when callback security is
disabled.
Disables callback security.
Enables callback security.
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