Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 08-05-2008 Installation Manual page 591

1. Smaller private branch exchanges (PBX) built for home purposes mostly use
the Euro-ISDN (EDSS1) protocol for internal calls. These exchanges have an
internal S0 bus and use internal numbers for the equipment connected to them.
Use one of the internal numbers as your MSN. You should be able to use at least
one of the exchange's MSNs that have been enabled for direct outward dialing.
If this does not work, try a single zero. For further information, consult the
documentation that came with your phone exchange.
2. Larger phone exchanges designed for businesses normally use the 1TR6 protocol
for internal calls. Their MSN is called EAZ and usually corresponds to the direct-
dial number. For the configuration under Linux, it should be sufficient to enter
the last digit of the EAZ. As a last resort, try each of the digits from 1 to 9.
For the connection to be terminated just before the next charge unit is due, enable
ChargeHUP. However, remember that may not work with every ISP. You can also
enable channel bundling (multilink PPP) by selecting the corresponding option. Finally,
you can enable SuSEfirewall2 for your link by selecting External Firewall Interface
and Restart Firewall. To enable the normal user without administrator permissions to
activate or deactivate the interface, select the User Controlled.
Details opens a dialog in which to configure callback mode, remote connections to this
interface and additional ippd options. Leave the Details dialog by selecting OK.
In the next dialog, make IP address settings. If you have not been given a static IP by
your provider, select Dynamic IP Address. Otherwise, use the fields provided to enter
your host's local IP address and the remote IP address according to the specifications
of your ISP. If the interface should be the default route to the Internet, select Default
Route. Each host can only have one interface configured as the default route. Leave
this dialog by selecting Next.
The following dialog allows you to set your country and select an ISP. The ISPs included
in the list are call-by-call providers only. If your ISP is not in the list, select New. This
opens the Provider Parameters dialog in which to enter all the details for your ISP.
When entering the phone number, do not include any blanks or commas among the
digits. Finally, enter your login and the password as provided by the ISP. When finished,
select Next.
To use Dial on Demand on a stand-alone workstation, also specify the name server
(DNS server). Most ISPs support dynamic DNS, which means the IP address of a name
server is sent by the ISP each time you connect. For a single workstation, however, you
Basic Networking 573