9
Features
these X.31 connections to be routed
to the same external S
0
interface.
The routing table for X.31 packet
data is set in the Configurator under
PBX Configuration: X.31. Addi-
tional information can be found in
the Configurator online help files.
Internet Access
It is possible to connect individual
PCs to the OpenCom 100 via the in-
ternal S
0
ports, or to connect an en-
tire LAN to the OpenCom 100 via the
Ethernet port. These PCs can access
the Internet via the OpenCom 100. If
Internet access is already available
from an Internet service provider,
this can be configured in the
OpenCom 100. If the client network
is not IP-capable, the OpenCom 100
can administer the IP configuration
necessary for Internet access. The
OpenCom 100 has an integrated
DHCP server and a DNS server, which
in this case take over IP address ad-
ministration and name resolution for
the client PCs.
The OpenCom 100 enables Internet
access for all connected PCs by
means of a common IP address. Only
this is externally visible. The local IP
addresses of the client PCs are trans-
lated to the IP address of the
OpenCom 100 by network address
translation (NAT). In this way the cli-
ent PCs in the LAN cannot be
reached directly from the Internet.
This protects them from direct exter-
nal attack. The LAN is additionally
protected by the OpenCom 100 filter
lists, which can be customised indi-
vidually (firewall function).
Note: We recommend you to read
through the explanations under Use-
ful Information on Internet Access
starting on page 90.
DECT Data Communication
Note: With an OpenCom 131 DECT
Data Communication is not possible
because the OpenCom 131 U
pn
ports
are not DECT-enabled.
A USB DECT Box or the
OpenPhone 27 DECT terminals ena-
ble PCs that are not connected to the
OpenCom 100 via the internal S
0
ports or the Ethernet interface to ac-
cess the Internet. These PCs can
make full use of all the Internet and
e-mail features of the OpenCom 100.
Data is transmitted via the internal
data interface of the OpenPhone 27.
For this the OpenPhone 27 is con-
nected via a supplied adapter with
the serial port of the PC. The Internet
can then be accessed directly via the
remote data transfer (i.e. dial-up)
network. The OpenPhone 27 sets up
a data connection with the
OpenCom 100 via the DECT air inter-
face. The remainder of the connec-
tion set-up is either direct - through
an ISDN B-channel - or indirect -
through the internal RAS access of
the OpenCom 100. Indirect RAS ac-
cess is preferable. This uses the rout-