Dial Access Security
12-3
3910-A2-GN32-40
September 1998
The following examples illustrate two ways to enter a VF-side password:
ATDP5551234TW12345678# or ATDT5551234@12345678#
Where:
ATD is the AT dial command.
P and T are the Pulse dial and Tone (DTMF) dial modifiers.
5551234 is the phone number.
W or @ is the VF Prompt Tone option setting for second dial tone or quiet answer.
12345678 is the VF-side password.
# is the password termination character.
NOTE
While pulse dial can be used to originate the call, DTMF tones must
be used for the password. This can be accomplished by using the P
and T modifiers appropriately. Refer to the Dial command in
Chapter 14, AT Command Set and S-Registers, for more on
modifiers.
This method of password entry requires that the answering modem be a 3900 Series modem. Of
course, the 3900 Series modem must be configured for VF-side password entry and the originating
user must know the correct VF-side password. The originating modem can be another 3900 Series
modem or any vendor’s modem.
DTE-Side Passwords
DTE-side password entry requires the originating user to supply a valid password via the DTE.
This method of password entry occurs after the modems’ training sequence, but before normal
connection. The modems must be configured for asynchronous operation to use this type of
security.
When using DTE-side password entry, the modems go through their normal training and error
control negotiation. Once complete, the answering modem requests a valid password from the
originating user. The originating user must enter, via the DTE, a password that can consist of digits
and case-insensitive letters. Note that DTE passwords can be from 1 to 6 characters in length. The
answering modem verifies the password against its password database table, and if valid,
completes the data connection, thus allowing DTE data to be passed. As with VF-side password
entry, the answering modem must be a 3900 Series modem and the originating modem can be
either a 3900 Series modem or any vendor’s modem.
The following example illustrates the format of DTE-side password:
TYPE:
abc123
PRESS:
Enter
Where:
abc123 is a 6-alphanumeric character number. Characters used for DTE-side
passwords are case insensitive.
