DTE-Side Passwords

Security

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 3800 Series modem. Of course, the 3800 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 3800 Series modem or any vendor's modem.

Some originating modems may not recognize the W modifier as a wait for second dial tone. If your call disconnects due to a VF Password Timeout or an Unknown VF Password, first verify that the answering 3800 Series modem's VF Prompt Type is set for 2nd Dial Tone. Next, verify that the Dial Tone Detect configuration option in the originating modem is enabled. Third, insert several Pause (,) modifiers into the dial string instead of the W modifier. (For the 3800 Series modem, each Pause, which is determined by the Pause Time configuration option (S8), is equal to 2 seconds.) This allows a delay between the processing of the phone number by the answering modem and the transmission of the VF-side password by the originating modem.

Some experimentation may be necessary to determine the number of pauses necessary for your call.

DTE-side password entry requires the originating user to supply a valid password via his 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 3800 Series modem and the originating modem can be either a 3800 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 10-alphanumeric character number. Characters used for DTE-side passwords are case insensitive.

Combination of VF-Side and