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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.

Callback Enable/Disable

Command:

#DBn

Values:

n = 0 or 1

Default:

Description:

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.

#DB0

Disables callback security.

#DB1

Enables callback security.

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