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Setting Callback dial strings
The Sentry integrated Modem supports definition of up to 30 callback dial strings.
The AT&Z command is used to set a dial string. Dial strings may be up to 34 characters and may
include other AT commands.
To set a Callback dial string:
After successfully logging into the modem with the Setup password, type at&z, followed by the
memory location (0-29), =at, dt (tone-dial) or dp (pulse-dial) and the number/dial string. Press Enter.
Examples
The following command sets the dial string for memory location 0 to tone-dial, 1-775-284-2000:
at&z0=atdt17752842000<Enter>
The following command sets the dial string for memory location 29 to pulse-dial, 1-775-555-1212:
at&z29=atdp17755551212<Enter>
To verify and reset the modem with the configured dial strings:
Type at&v and press Enter.
Type atz and press Enter.
NOTE: Callback Security dial strings may also be configured to allow a user to bypass the stored number with a dynamic
entry or make a direct connection without a callback. Server Technology does not recommend the use of these options as
they have a negative effect on security for the modem connection.
To enable these options additional characters are required when setting a dial string:
+ enables optional dynamic callback dial string entry
- enables optional direct connection without a callback
,??? Used with ‘+’ enables optional use of dynamic extension entry
Examples
The following command enables dynamic callback string and extension entry where the extension length is 5 characters:
at&z0=+atdt17752842000,?????<Enter>
The following command enables direct connection without a callback:
at&z0=-atdp17755551212<Enter>
Resetting a Callback memory location
The AT#CBR command is used to reset the dial string and password for any given memory location.
To reset a Callback memory location:
After successfully logging into the modem with the Setup password, type at#cbr, followed by the
memory location (0-29), and press Enter.
Type atz and press Enter to reset the modem with the new settings.
Example
The following commands reset memory location 0:
at#cbr0<Enter>
OK
atz<Enter>
OK
8 • Operations Sentry Global Security Modem
Installation and Operations Manual