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Enabling or disabling Callback Security
Callback Security provides a higher level of security against unauthorized access by requiring the
connecting user to be at a predefined location when establishing a modem session to the Sentry.
When enabled, Callback Security requires submission of a valid callback password at initial connection.
This password is compared to a predefined callback number/password table for a return call by the
modem. The modem then terminates the initial connection and returns the call to the predefined
number associated with the supplied password and upon reconnection the user is required to resubmit
the callback password before proceeding with the Sentry username/password authentication.
The AT#CBS command is used to enabled or disabled Callback Security.
NOTE: To use Callback Security, Auto-answer must be enabled on the calling modem (S0=1).
To enable Callback Security:
After successfully logging into the modem with the Setup password, type at#cbs2 and press Enter to
enable Callback Security.
Type at&w and press Enter to store the settings in nonvolatile memory.
Type atz and press Enter to reset the modem with the new settings.
Example
The following commands enable Callback Security:
at#cbs2<Enter>
OK
at&w<Enter>
OK
atz<Enter>
OK
To disable Callback Security:
After successfully logging into the modem with the Setup password, type at#cbs0 and press Enter to
disable Callback Security.
Type at&w and press Enter to store the settings in nonvolatile memory.
Type atz and press Enter to reset the modem with the new settings.
Example
The following commands disable Callback Security:
at#cbs0<Enter>
OK
at&w<Enter>
OK
atz<Enter>
OK
Setting Callback passwords
The AT#CBN command is used to set a password for each of the Callback dial string previously
defined. Passwords must be unique and 6 to 10 characters in length.
NOTE: Passwords are case-sensitive and may not include the + or – characters and must be unique.
To set a Callback password:
After successfully logging into the modem with the Setup password, type at#cbn, followed by the
memory location (0-29), = and the password. Press Enter.
Type atz and press Enter to reset the modem with the new settings.
Example
The following command sets the password for memory location 29 to ‘WhOduNnIt’:
at#cbn29=WhOduNnIt<Enter>
OK
atz<Enter>
OK
To verify the configured password:
After re-authenticating with the Setup password, type at&v and press Enter.
Sentry Global Security Modem Operations • 7
Installation and Operations Manual