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6 Callback Security
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• To turn off callback security, type AT#CBS0 and press ENTER.
Callers no longer need a password to connect to the modem, the
modem is unable to call them back, and the stored dialing com-
mand locations 0–3 become available.
• To turn on both local and remote callback security, type
AT#CBS1 and press ENTER. With local security turned on, you
must enter the setup password before you can enter any AT
command except the
AT
,
ATIn
, and
AT#Sxxxxxxxx
commands.
For a description of remote callback security, see the following
paragraph.
• To turn on remote callback security only, type AT#CBS2 and
press ENTER. With remote callback security turned on, each
caller is asked to enter a password, is called back, and then is
asked to enter the password again before a connection can be
made. Also, dialing command locations 0–3, for use with the
DS=y
dialing command, are replaced by callback dialing com-
mand locations 0–29.
• 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 connec-
tion, callback security remains disabled.
To Set the Parity of the Callback Security Messages
The parity of the modem’s password prompt and messages must match
the parity of the computer the modem is connected to.
1. Open a data communications program such as HyperTerminal.