elmeg T444, Руководство пользователя, Страница: 6 / 36

·
Using xDSL (for example: SDSL) in conjunction with a DSL modem that is compatible with your ISP with a
set, public IP address. These connections require the public IP address that you have been assigned, the IP
address of the next gateway (next hop) and the IP address for the name server of your provider.
·
Tunneling. Here, data packets of one protocol are packed into the shell of a different protocol to route them
on to the Internet. At the recipient the shell is then removed and the data packet routed on with the original
protocol. This tunneling is used to overcome incompatible networks, or when taking into consideration se-
curity and cost aspects (for example PPTP). Normally, you only need your user name and password as ac-
cess data. Indicate all the data that is also specified to you by your provider (for example, number, IP
address and DNS server.
The ISP that you wish to use for your Internet connections is set in the configuration of the PABX system. You can
configure up to 10 ISPs. You can then define further settings for each ISP, such as user name, password, phone num-
ber, etc.. You can also define whether the connection to the Internet is to be set up automatically (default setting) and
that the next ISP in your list is to be selected once the connection has been established (fall-back).
When the PABX system router receives the command to establish an Internet connection this connection is set up
using the first ISP in your list. If the connection is set up successfully all of the clients in your network can access the
Internet. If the Internet connection is no longer needed (inactivity) it is terminated after a defined time.
If an Internet connection can not be set up using the selected ISP an attempt is made to establish the connection using
the next ISP in your list (fall-back).
When an Internet connection is terminated, the first ISP in the list is used when the next connection attempt is initi-
ally carried out.
Note
For more information about configuring ISPs and establishing an internet connection, refer to the operator’s ma-
nual of your PABX.
Note
If “hubs” are installed in your network, for example, or if a connection to the Internet still exists, data packets may
continue to be sent to the router and the connection can not be terminated.
Dial-in into the LAN (RAS)
Using the Remote Access Server (RAS) a field representative, for example, can call into the local network from an ex-
ternal location and then via the local network access the Internet. Access from an external location is also possible via
an ISDN connection.
External access is provided with user-name and password protection. If the call is made from an external location
only, the phone number can also be monitored as an added protection feature. Access can be enabled for up to 8
users. A Windows enable (access to computer, files or printers) and Internet enable can also be configured for each
user.
A PC that dials into the local network via RAS is automatically assigned an IP address by the integrated DHCP server.
RAS Callback:
If you do not want to be charged for connections within your company network you can configure the RAS connecti-
on as an automatic call-back. For this, a brief connection is set up to the company network (for which you are char-
ged) that then initiates a call-back. The PABX system at your company then calls you back and you are not charged
for the ensuing connection time. You can enter a number for the corresponding RAS connection in the configurati-
on. Automatic call-back is then only possible from this number. If you do not enter a number here, the automatic
call-back can be made from any number.
Introduction Dial-in into the LAN (RAS)
2