Multitech MultiAccess MA30120 User Manual page 91

Chapter 3 – Software
Modem Setup > Modem Usage
A common dial in modem sharing application is where a proprietary host application, running on a sever that
has IP access to MultiAccess, opens multiple telnet sockets (one to each modem) to the MultiAccess. When
the sockets are opened, the application can look for incoming calls\rings, instruct the modem to answer and
then process data from the remote end. The application can also originate calls to remote locations if it so
chooses by instructing the modem to dial.
Modem Sharing - no authentication - When a Telnet client opens a socket to the MultiAccess, access is
immediately given to the modem. Take care to secure access to these ports via firewall or IP filter rules to
prevent unwanted access.
Modem Sharing - local authentication - When a Telnet client opens a socket to the MultiAccess, a login
prompt is issued by the Multiaccess to the client trying to use the resource. The client/user must supply a valid
set of credentials (defined in the Local User data base), before access is granted. The Local User database is
found in the User Authentication menu.
Modem Sharing - radius authentication - When a Telnet client opens a socket to the MultiAccess, a login
prompt is issued by the Multiaccess to the client trying to use the resource. The client/user must supply a valid
set of credentials (defined in the RADIUS User data base), before access is granted. The RADIUS User
database is a variable depending if your RADIUS server is external to the MultiAccess or if you are using the
internal RADIUS server. See the User Authentication group of menus for more details.
Modem Sharing - local & radius authentication - When a Telnet client opens a socket to the MultiAccess, a
login prompt is issued by the Multiaccess to the client trying to use the resource. The client/user must supply a
valid set of credentials defined in either the Local User database or the RADIUS User database, before access
is granted. All credentials are normally checked against the RADIUS data base. If the RADIUS server rejects
the credentials, access to the modem resource is denied. If the user is to authenticate against the Local
database they must include an ! (exclaimation point) in front of the username. The ! is a flag used to instruct
the authenticator process to check the Local User database instead of the RADIUS database. For example if
the administrator of the Multiaccess adds a username of "Bob" with a password of "J3imK!123" to the Local
User database, when the user provides the credentials the username would be entered as "!Bob" with no
change to the password.
Custom - Custom usage is reserved for when a 3rd party application is installed into the Linux OS, in which the
MultiAccess RAS, Fax, or Modem Sharing programs do not attempt to control or use the tty modem ports.
Modem Usage Setup - Modem Sharing
The following parameters only apply after the usage is Modem Sharing.
Display Called Number
This parameter applies to inbound (received) calls when the Line Interface type is PRI. The telephone number
(or final digits) dialed by the originator will be displayed into the telnet socket following the first "ring" message.
The Called Number information (string of digits) is provided by the central office switch and is commonly
referred to as DNIS. The MultiAccess does not support DNIS when the Line Interface type is T1-RBS.
Reverse Dial
This parameter enables two features, comma dialing and reverse dial mode. When enabled, the dial string can
include the use of commas, used to create a pause between digits of the dial string (most commonly used to
specify the extension of the answering modem).
Example: "atdt18003334444,,,,,4321". Each comma creates a 2 second pause. 4321 is the extension of the
desitination phone line\modem.
Reverse dial mode is where the dial string includes the letter "r" at the very end of the dial string, the purpose of
which is to instruct the MultiAccess modem to switch from originate to answer mode after dialing. For example:
"atdt17637175549r".
Please Note: When Reverse Dial is enabled, the dial string must include the tone (t) command, for example,
atdtstring .
MultiAccess Communications Server MA30120 User Guide 91